Header And Logo
|
#include "nodes/execnodes.h"
Go to the source code of this file.
Defines | |
| #define | DEFAULT_INDEX_TYPE "btree" |
| #define | REINDEX_REL_PROCESS_TOAST 0x01 |
| #define | REINDEX_REL_SUPPRESS_INDEX_USE 0x02 |
| #define | REINDEX_REL_CHECK_CONSTRAINTS 0x04 |
Typedefs | |
| typedef void(* | IndexBuildCallback )(Relation index, HeapTuple htup, Datum *values, bool *isnull, bool tupleIsAlive, void *state) |
Enumerations | |
| enum | IndexStateFlagsAction { INDEX_CREATE_SET_READY, INDEX_CREATE_SET_VALID, INDEX_DROP_CLEAR_VALID, INDEX_DROP_SET_DEAD } |
Functions | |
| void | index_check_primary_key (Relation heapRel, IndexInfo *indexInfo, bool is_alter_table) |
| Oid | index_create (Relation heapRelation, const char *indexRelationName, Oid indexRelationId, Oid relFileNode, IndexInfo *indexInfo, List *indexColNames, Oid accessMethodObjectId, Oid tableSpaceId, Oid *collationObjectId, Oid *classObjectId, int16 *coloptions, Datum reloptions, bool isprimary, bool isconstraint, bool deferrable, bool initdeferred, bool allow_system_table_mods, bool skip_build, bool concurrent, bool is_internal) |
| void | index_constraint_create (Relation heapRelation, Oid indexRelationId, IndexInfo *indexInfo, const char *constraintName, char constraintType, bool deferrable, bool initdeferred, bool mark_as_primary, bool update_pgindex, bool remove_old_dependencies, bool allow_system_table_mods, bool is_internal) |
| void | index_drop (Oid indexId, bool concurrent) |
| IndexInfo * | BuildIndexInfo (Relation index) |
| void | FormIndexDatum (IndexInfo *indexInfo, TupleTableSlot *slot, EState *estate, Datum *values, bool *isnull) |
| void | index_build (Relation heapRelation, Relation indexRelation, IndexInfo *indexInfo, bool isprimary, bool isreindex) |
| double | IndexBuildHeapScan (Relation heapRelation, Relation indexRelation, IndexInfo *indexInfo, bool allow_sync, IndexBuildCallback callback, void *callback_state) |
| void | validate_index (Oid heapId, Oid indexId, Snapshot snapshot) |
| void | index_set_state_flags (Oid indexId, IndexStateFlagsAction action) |
| void | reindex_index (Oid indexId, bool skip_constraint_checks) |
| bool | reindex_relation (Oid relid, int flags) |
| bool | ReindexIsProcessingHeap (Oid heapOid) |
| bool | ReindexIsProcessingIndex (Oid indexOid) |
| Oid | IndexGetRelation (Oid indexId, bool missing_ok) |
| #define DEFAULT_INDEX_TYPE "btree" |
Definition at line 20 of file index.h.
Referenced by transformIndexConstraint().
| #define REINDEX_REL_CHECK_CONSTRAINTS 0x04 |
Definition at line 110 of file index.h.
Referenced by reindex_relation().
| #define REINDEX_REL_PROCESS_TOAST 0x01 |
Definition at line 108 of file index.h.
Referenced by ExecuteTruncate(), reindex_relation(), ReindexDatabase(), and ReindexTable().
| #define REINDEX_REL_SUPPRESS_INDEX_USE 0x02 |
Definition at line 109 of file index.h.
Referenced by reindex_relation().
| INDEX_CREATE_SET_READY | |
| INDEX_CREATE_SET_VALID | |
| INDEX_DROP_CLEAR_VALID | |
| INDEX_DROP_SET_DEAD |
Definition at line 31 of file index.h.
{
INDEX_CREATE_SET_READY,
INDEX_CREATE_SET_VALID,
INDEX_DROP_CLEAR_VALID,
INDEX_DROP_SET_DEAD
} IndexStateFlagsAction;
Definition at line 1630 of file index.c.
References elog, ERROR, i, IndexInfo::ii_BrokenHotChain, IndexInfo::ii_Concurrent, IndexInfo::ii_ExclusionOps, IndexInfo::ii_ExclusionProcs, IndexInfo::ii_ExclusionStrats, IndexInfo::ii_Expressions, IndexInfo::ii_ExpressionsState, IndexInfo::ii_KeyAttrNumbers, IndexInfo::ii_NumIndexAttrs, IndexInfo::ii_Predicate, IndexInfo::ii_PredicateState, IndexInfo::ii_ReadyForInserts, IndexInfo::ii_Unique, INDEX_MAX_KEYS, IndexIsReady, makeNode, RelationData::rd_index, RelationGetExclusionInfo(), RelationGetIndexExpressions(), RelationGetIndexPredicate(), and RelationGetRelid.
Referenced by ATExecAddIndexConstraint(), DefineIndex(), do_analyze_rel(), ExecOpenIndices(), get_actual_variable_range(), reindex_index(), RelationGetIndexAttrBitmap(), RelationTruncateIndexes(), tuplesort_begin_cluster(), and validate_index().
{
IndexInfo *ii = makeNode(IndexInfo);
Form_pg_index indexStruct = index->rd_index;
int i;
int numKeys;
/* check the number of keys, and copy attr numbers into the IndexInfo */
numKeys = indexStruct->indnatts;
if (numKeys < 1 || numKeys > INDEX_MAX_KEYS)
elog(ERROR, "invalid indnatts %d for index %u",
numKeys, RelationGetRelid(index));
ii->ii_NumIndexAttrs = numKeys;
for (i = 0; i < numKeys; i++)
ii->ii_KeyAttrNumbers[i] = indexStruct->indkey.values[i];
/* fetch any expressions needed for expressional indexes */
ii->ii_Expressions = RelationGetIndexExpressions(index);
ii->ii_ExpressionsState = NIL;
/* fetch index predicate if any */
ii->ii_Predicate = RelationGetIndexPredicate(index);
ii->ii_PredicateState = NIL;
/* fetch exclusion constraint info if any */
if (indexStruct->indisexclusion)
{
RelationGetExclusionInfo(index,
&ii->ii_ExclusionOps,
&ii->ii_ExclusionProcs,
&ii->ii_ExclusionStrats);
}
else
{
ii->ii_ExclusionOps = NULL;
ii->ii_ExclusionProcs = NULL;
ii->ii_ExclusionStrats = NULL;
}
/* other info */
ii->ii_Unique = indexStruct->indisunique;
ii->ii_ReadyForInserts = IndexIsReady(indexStruct);
/* initialize index-build state to default */
ii->ii_Concurrent = false;
ii->ii_BrokenHotChain = false;
return ii;
}
| void FormIndexDatum | ( | IndexInfo * | indexInfo, | |
| TupleTableSlot * | slot, | |||
| EState * | estate, | |||
| Datum * | values, | |||
| bool * | isnull | |||
| ) |
Definition at line 1700 of file index.c.
References Assert, elog, ERROR, ExecEvalExprSwitchContext(), ExecPrepareExpr(), GetPerTupleExprContext, i, IndexInfo::ii_Expressions, IndexInfo::ii_ExpressionsState, IndexInfo::ii_KeyAttrNumbers, IndexInfo::ii_NumIndexAttrs, lfirst, list_head(), lnext, NIL, NULL, and slot_getattr().
Referenced by CatalogIndexInsert(), check_exclusion_constraint(), comparetup_cluster(), compute_index_stats(), ExecInsertIndexTuples(), get_actual_variable_range(), IndexBuildHeapScan(), IndexCheckExclusion(), and validate_index_heapscan().
{
ListCell *indexpr_item;
int i;
if (indexInfo->ii_Expressions != NIL &&
indexInfo->ii_ExpressionsState == NIL)
{
/* First time through, set up expression evaluation state */
indexInfo->ii_ExpressionsState = (List *)
ExecPrepareExpr((Expr *) indexInfo->ii_Expressions,
estate);
/* Check caller has set up context correctly */
Assert(GetPerTupleExprContext(estate)->ecxt_scantuple == slot);
}
indexpr_item = list_head(indexInfo->ii_ExpressionsState);
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
int keycol = indexInfo->ii_KeyAttrNumbers[i];
Datum iDatum;
bool isNull;
if (keycol != 0)
{
/*
* Plain index column; get the value we need directly from the
* heap tuple.
*/
iDatum = slot_getattr(slot, keycol, &isNull);
}
else
{
/*
* Index expression --- need to evaluate it.
*/
if (indexpr_item == NULL)
elog(ERROR, "wrong number of index expressions");
iDatum = ExecEvalExprSwitchContext((ExprState *) lfirst(indexpr_item),
GetPerTupleExprContext(estate),
&isNull,
NULL);
indexpr_item = lnext(indexpr_item);
}
values[i] = iDatum;
isnull[i] = isNull;
}
if (indexpr_item != NULL)
elog(ERROR, "wrong number of index expressions");
}
| void index_build | ( | Relation | heapRelation, | |
| Relation | indexRelation, | |||
| IndexInfo * | indexInfo, | |||
| bool | isprimary, | |||
| bool | isreindex | |||
| ) |
Definition at line 1955 of file index.c.
References Assert, AtEOXact_GUC(), CatalogUpdateIndexes(), CommandCounterIncrement(), DatumGetPointer, DEBUG1, elog, ereport, errmsg(), ERROR, GETSTRUCT, GetUserIdAndSecContext(), heap_close, heap_freetuple(), heap_open(), IndexBuildResult::heap_tuples, HeapTupleIsValid, IndexInfo::ii_BrokenHotChain, IndexInfo::ii_Concurrent, IndexInfo::ii_ExclusionOps, IndexBuildResult::index_tuples, index_update_stats(), IndexCheckExclusion(), IndexRelationId, INDEXRELID, INIT_FORKNUM, InvalidOid, NewGUCNestLevel(), NULL, ObjectIdGetDatum, OidFunctionCall1, OidFunctionCall3, PointerGetDatum, PointerIsValid, RelationData::rd_am, RelationData::rd_rel, RelationData::rd_smgr, RegProcedureIsValid, RelationGetRelationName, RelationGetRelid, RelationIsValid, RelationOpenSmgr, RELKIND_TOASTVALUE, RELPERSISTENCE_UNLOGGED, RowExclusiveLock, SearchSysCacheCopy1, SECURITY_RESTRICTED_OPERATION, SetUserIdAndSecContext(), simple_heap_update(), smgrcreate(), smgrexists(), and HeapTupleData::t_self.
Referenced by build_indices(), DefineIndex(), index_create(), reindex_index(), and RelationTruncateIndexes().
{
RegProcedure procedure;
IndexBuildResult *stats;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
/*
* sanity checks
*/
Assert(RelationIsValid(indexRelation));
Assert(PointerIsValid(indexRelation->rd_am));
procedure = indexRelation->rd_am->ambuild;
Assert(RegProcedureIsValid(procedure));
ereport(DEBUG1,
(errmsg("building index \"%s\" on table \"%s\"",
RelationGetRelationName(indexRelation),
RelationGetRelationName(heapRelation))));
/*
* Switch to the table owner's userid, so that any index functions are run
* as that user. Also lock down security-restricted operations and
* arrange to make GUC variable changes local to this command.
*/
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(heapRelation->rd_rel->relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/*
* Call the access method's build procedure
*/
stats = (IndexBuildResult *)
DatumGetPointer(OidFunctionCall3(procedure,
PointerGetDatum(heapRelation),
PointerGetDatum(indexRelation),
PointerGetDatum(indexInfo)));
Assert(PointerIsValid(stats));
/*
* If this is an unlogged index, we may need to write out an init fork for
* it -- but we must first check whether one already exists. If, for
* example, an unlogged relation is truncated in the transaction that
* created it, or truncated twice in a subsequent transaction, the
* relfilenode won't change, and nothing needs to be done here.
*/
if (heapRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
!smgrexists(indexRelation->rd_smgr, INIT_FORKNUM))
{
RegProcedure ambuildempty = indexRelation->rd_am->ambuildempty;
RelationOpenSmgr(indexRelation);
smgrcreate(indexRelation->rd_smgr, INIT_FORKNUM, false);
OidFunctionCall1(ambuildempty, PointerGetDatum(indexRelation));
}
/*
* If we found any potentially broken HOT chains, mark the index as not
* being usable until the current transaction is below the event horizon.
* See src/backend/access/heap/README.HOT for discussion.
*
* However, when reindexing an existing index, we should do nothing here.
* Any HOT chains that are broken with respect to the index must predate
* the index's original creation, so there is no need to change the
* index's usability horizon. Moreover, we *must not* try to change the
* index's pg_index entry while reindexing pg_index itself, and this
* optimization nicely prevents that.
*
* We also need not set indcheckxmin during a concurrent index build,
* because we won't set indisvalid true until all transactions that care
* about the broken HOT chains are gone.
*
* Therefore, this code path can only be taken during non-concurrent
* CREATE INDEX. Thus the fact that heap_update will set the pg_index
* tuple's xmin doesn't matter, because that tuple was created in the
* current transaction anyway. That also means we don't need to worry
* about any concurrent readers of the tuple; no other transaction can see
* it yet.
*/
if (indexInfo->ii_BrokenHotChain && !isreindex &&
!indexInfo->ii_Concurrent)
{
Oid indexId = RelationGetRelid(indexRelation);
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
pg_index = heap_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
/* If it's a new index, indcheckxmin shouldn't be set ... */
Assert(!indexForm->indcheckxmin);
indexForm->indcheckxmin = true;
simple_heap_update(pg_index, &indexTuple->t_self, indexTuple);
CatalogUpdateIndexes(pg_index, indexTuple);
heap_freetuple(indexTuple);
heap_close(pg_index, RowExclusiveLock);
}
/*
* Update heap and index pg_class rows
*/
index_update_stats(heapRelation,
true,
isprimary,
(heapRelation->rd_rel->relkind == RELKIND_TOASTVALUE) ?
RelationGetRelid(indexRelation) : InvalidOid,
stats->heap_tuples);
index_update_stats(indexRelation,
false,
false,
InvalidOid,
stats->index_tuples);
/* Make the updated catalog row versions visible */
CommandCounterIncrement();
/*
* If it's for an exclusion constraint, make a second pass over the heap
* to verify that the constraint is satisfied. We must not do this until
* the index is fully valid. (Broken HOT chains shouldn't matter, though;
* see comments for IndexCheckExclusion.)
*/
if (indexInfo->ii_ExclusionOps != NULL)
IndexCheckExclusion(heapRelation, indexRelation, indexInfo);
/* Roll back any GUC changes executed by index functions */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);
}
Definition at line 185 of file index.c.
References AlterTableInternal(), ATTNUM, elog, ereport, errcode(), errmsg(), ERROR, GETSTRUCT, HeapTupleIsValid, i, IndexInfo::ii_KeyAttrNumbers, IndexInfo::ii_NumIndexAttrs, Int16GetDatum, lappend(), makeNode, AlterTableCmd::name, NameStr, ObjectIdGetDatum, pstrdup(), RelationGetRelationName, RelationGetRelid, relationHasPrimaryKey(), ReleaseSysCache(), SearchSysCache2, and AlterTableCmd::subtype.
Referenced by ATExecAddIndexConstraint(), and DefineIndex().
{
List *cmds;
int i;
/*
* If ALTER TABLE, check that there isn't already a PRIMARY KEY. In CREATE
* TABLE, we have faith that the parser rejected multiple pkey clauses;
* and CREATE INDEX doesn't have a way to say PRIMARY KEY, so it's no
* problem either.
*/
if (is_alter_table &&
relationHasPrimaryKey(heapRel))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("multiple primary keys for table \"%s\" are not allowed",
RelationGetRelationName(heapRel))));
}
/*
* Check that all of the attributes in a primary key are marked as not
* null, otherwise attempt to ALTER TABLE .. SET NOT NULL
*/
cmds = NIL;
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
AttrNumber attnum = indexInfo->ii_KeyAttrNumbers[i];
HeapTuple atttuple;
Form_pg_attribute attform;
if (attnum == 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("primary keys cannot be expressions")));
/* System attributes are never null, so no need to check */
if (attnum < 0)
continue;
atttuple = SearchSysCache2(ATTNUM,
ObjectIdGetDatum(RelationGetRelid(heapRel)),
Int16GetDatum(attnum));
if (!HeapTupleIsValid(atttuple))
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
attnum, RelationGetRelid(heapRel));
attform = (Form_pg_attribute) GETSTRUCT(atttuple);
if (!attform->attnotnull)
{
/* Add a subcommand to make this one NOT NULL */
AlterTableCmd *cmd = makeNode(AlterTableCmd);
cmd->subtype = AT_SetNotNull;
cmd->name = pstrdup(NameStr(attform->attname));
cmds = lappend(cmds, cmd);
}
ReleaseSysCache(atttuple);
}
/*
* XXX: Shouldn't the ALTER TABLE .. SET NOT NULL cascade to child tables?
* Currently, since the PRIMARY KEY itself doesn't cascade, we don't
* cascade the notnull constraint(s) either; but this is pretty debatable.
*
* XXX: possible future improvement: when being called from ALTER TABLE,
* it would be more efficient to merge this with the outer ALTER TABLE, so
* as to avoid two scans. But that seems to complicate DefineIndex's API
* unduly.
*/
if (cmds)
AlterTableInternal(RelationGetRelid(heapRel), cmds, false);
}
| void index_constraint_create | ( | Relation | heapRelation, | |
| Oid | indexRelationId, | |||
| IndexInfo * | indexInfo, | |||
| const char * | constraintName, | |||
| char | constraintType, | |||
| bool | deferrable, | |||
| bool | initdeferred, | |||
| bool | mark_as_primary, | |||
| bool | update_pgindex, | |||
| bool | remove_old_dependencies, | |||
| bool | allow_system_table_mods, | |||
| bool | is_internal | |||
| ) |
Definition at line 1114 of file index.c.
References CreateTrigStmt::args, Assert, CatalogUpdateIndexes(), ObjectAddress::classId, CreateTrigStmt::columns, CONSTRAINT_EXCLUSION, CreateTrigStmt::constrrel, CreateConstraintEntry(), CreateTrigger(), CreateTrigStmt::deferrable, deleteDependencyRecordsForClass(), DEPENDENCY_AUTO, DEPENDENCY_INTERNAL, elog, ereport, errcode(), errmsg(), ERROR, CreateTrigStmt::events, CreateTrigStmt::funcname, get_namespace_name(), GETSTRUCT, heap_close, heap_freetuple(), heap_open(), HeapTupleIsValid, IndexInfo::ii_ExclusionOps, IndexInfo::ii_Expressions, IndexInfo::ii_KeyAttrNumbers, IndexInfo::ii_NumIndexAttrs, index_update_stats(), IndexRelationId, INDEXRELID, CreateTrigStmt::initdeferred, InvalidOid, InvokeObjectPostAlterHookArg, IsBootstrapProcessingMode, CreateTrigStmt::isconstraint, IsNormalProcessingMode, IsSystemRelation(), makeNode, makeRangeVar(), NULL, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, pstrdup(), recordDependencyOn(), CreateTrigStmt::relation, RelationGetNamespace, RelationGetRelationName, RelationGetRelid, RelationRelationId, CreateTrigStmt::row, RowExclusiveLock, SearchSysCacheCopy1, simple_heap_update(), SystemFuncName(), HeapTupleData::t_self, CreateTrigStmt::timing, TRIGGER_TYPE_INSERT, CreateTrigStmt::trigname, and CreateTrigStmt::whenClause.
Referenced by ATExecAddIndexConstraint(), and index_create().
{
Oid namespaceId = RelationGetNamespace(heapRelation);
ObjectAddress myself,
referenced;
Oid conOid;
/* constraint creation support doesn't work while bootstrapping */
Assert(!IsBootstrapProcessingMode());
/* enforce system-table restriction */
if (!allow_system_table_mods &&
IsSystemRelation(heapRelation) &&
IsNormalProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("user-defined indexes on system catalog tables are not supported")));
/* primary/unique constraints shouldn't have any expressions */
if (indexInfo->ii_Expressions &&
constraintType != CONSTRAINT_EXCLUSION)
elog(ERROR, "constraints cannot have index expressions");
/*
* If we're manufacturing a constraint for a pre-existing index, we need
* to get rid of the existing auto dependencies for the index (the ones
* that index_create() would have made instead of calling this function).
*
* Note: this code would not necessarily do the right thing if the index
* has any expressions or predicate, but we'd never be turning such an
* index into a UNIQUE or PRIMARY KEY constraint.
*/
if (remove_old_dependencies)
deleteDependencyRecordsForClass(RelationRelationId, indexRelationId,
RelationRelationId, DEPENDENCY_AUTO);
/*
* Construct a pg_constraint entry.
*/
conOid = CreateConstraintEntry(constraintName,
namespaceId,
constraintType,
deferrable,
initdeferred,
true,
RelationGetRelid(heapRelation),
indexInfo->ii_KeyAttrNumbers,
indexInfo->ii_NumIndexAttrs,
InvalidOid, /* no domain */
indexRelationId, /* index OID */
InvalidOid, /* no foreign key */
NULL,
NULL,
NULL,
NULL,
0,
' ',
' ',
' ',
indexInfo->ii_ExclusionOps,
NULL, /* no check constraint */
NULL,
NULL,
true, /* islocal */
0, /* inhcount */
true, /* noinherit */
is_internal);
/*
* Register the index as internally dependent on the constraint.
*
* Note that the constraint has a dependency on the table, so we don't
* need (or want) any direct dependency from the index to the table.
*/
myself.classId = RelationRelationId;
myself.objectId = indexRelationId;
myself.objectSubId = 0;
referenced.classId = ConstraintRelationId;
referenced.objectId = conOid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_INTERNAL);
/*
* If the constraint is deferrable, create the deferred uniqueness
* checking trigger. (The trigger will be given an internal dependency on
* the constraint by CreateTrigger.)
*/
if (deferrable)
{
RangeVar *heapRel;
CreateTrigStmt *trigger;
heapRel = makeRangeVar(get_namespace_name(namespaceId),
pstrdup(RelationGetRelationName(heapRelation)),
-1);
trigger = makeNode(CreateTrigStmt);
trigger->trigname = (constraintType == CONSTRAINT_PRIMARY) ?
"PK_ConstraintTrigger" :
"Unique_ConstraintTrigger";
trigger->relation = heapRel;
trigger->funcname = SystemFuncName("unique_key_recheck");
trigger->args = NIL;
trigger->row = true;
trigger->timing = TRIGGER_TYPE_AFTER;
trigger->events = TRIGGER_TYPE_INSERT | TRIGGER_TYPE_UPDATE;
trigger->columns = NIL;
trigger->whenClause = NULL;
trigger->isconstraint = true;
trigger->deferrable = true;
trigger->initdeferred = initdeferred;
trigger->constrrel = NULL;
(void) CreateTrigger(trigger, NULL, conOid, indexRelationId, true);
}
/*
* If needed, mark the table as having a primary key. We assume it can't
* have been so marked already, so no need to clear the flag in the other
* case.
*
* Note: this might better be done by callers. We do it here to avoid
* exposing index_update_stats() globally, but that wouldn't be necessary
* if relhaspkey went away.
*/
if (mark_as_primary)
index_update_stats(heapRelation,
true,
true,
InvalidOid,
-1.0);
/*
* If needed, mark the index as primary and/or deferred in pg_index.
*
* Note: since this is a transactional update, it's unsafe against
* concurrent SnapshotNow scans of pg_index. When making an existing
* index into a constraint, caller must have a table lock that prevents
* concurrent table updates; if it's less than a full exclusive lock,
* there is a risk that concurrent readers of the table will miss seeing
* this index at all.
*/
if (update_pgindex && (mark_as_primary || deferrable))
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
bool dirty = false;
pg_index = heap_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexRelationId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexRelationId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
if (mark_as_primary && !indexForm->indisprimary)
{
indexForm->indisprimary = true;
dirty = true;
}
if (deferrable && indexForm->indimmediate)
{
indexForm->indimmediate = false;
dirty = true;
}
if (dirty)
{
simple_heap_update(pg_index, &indexTuple->t_self, indexTuple);
CatalogUpdateIndexes(pg_index, indexTuple);
InvokeObjectPostAlterHookArg(IndexRelationId, indexRelationId, 0,
InvalidOid, is_internal);
}
heap_freetuple(indexTuple);
heap_close(pg_index, RowExclusiveLock);
}
}
| Oid index_create | ( | Relation | heapRelation, | |
| const char * | indexRelationName, | |||
| Oid | indexRelationId, | |||
| Oid | relFileNode, | |||
| IndexInfo * | indexInfo, | |||
| List * | indexColNames, | |||
| Oid | accessMethodObjectId, | |||
| Oid | tableSpaceId, | |||
| Oid * | collationObjectId, | |||
| Oid * | classObjectId, | |||
| int16 * | coloptions, | |||
| Datum | reloptions, | |||
| bool | isprimary, | |||
| bool | isconstraint, | |||
| bool | deferrable, | |||
| bool | initdeferred, | |||
| bool | allow_system_table_mods, | |||
| bool | skip_build, | |||
| bool | concurrent, | |||
| bool | is_internal | |||
| ) |
Definition at line 679 of file index.c.
References AccessExclusiveLock, AppendAttributeTuples(), Assert, binary_upgrade_next_index_pg_class_oid, ObjectAddress::classId, CommandCounterIncrement(), ConstructTupleDescriptor(), DEFAULT_COLLATION_OID, DEPENDENCY_AUTO, DEPENDENCY_NORMAL, elog, ereport, errcode(), errmsg(), errmsg_internal(), ERROR, get_relname_relid(), GetNewRelFileNode(), GLOBALTABLESPACE_OID, heap_close, heap_create(), heap_open(), i, IndexInfo::ii_ExclusionOps, IndexInfo::ii_Expressions, IndexInfo::ii_KeyAttrNumbers, IndexInfo::ii_NumIndexAttrs, IndexInfo::ii_Predicate, IndexInfo::ii_Unique, index_build(), index_close(), index_constraint_create(), index_register(), index_update_stats(), InitializeAttributeOids(), InsertPgClassTuple(), InvalidOid, InvokeObjectPostCreateHookArg, IsBinaryUpgrade, IsBootstrapProcessingMode, IsNormalProcessingMode, IsSystemRelation(), LockRelation(), NoLock, NULL, ObjectAddress::objectId, ObjectAddress::objectSubId, OidIsValid, RelationData::rd_indexcxt, RelationData::rd_rel, recordDependencyOn(), recordDependencyOnSingleRelExpr(), RelationGetNamespace, RelationGetRelid, RelationInitIndexAccessInfo(), RelationIsMapped, RelationRelationId, RELKIND_INDEX, RowExclusiveLock, and UpdateIndexRelation().
Referenced by create_toast_table(), and DefineIndex().
{
Oid heapRelationId = RelationGetRelid(heapRelation);
Relation pg_class;
Relation indexRelation;
TupleDesc indexTupDesc;
bool shared_relation;
bool mapped_relation;
bool is_exclusion;
Oid namespaceId;
int i;
char relpersistence;
is_exclusion = (indexInfo->ii_ExclusionOps != NULL);
pg_class = heap_open(RelationRelationId, RowExclusiveLock);
/*
* The index will be in the same namespace as its parent table, and is
* shared across databases if and only if the parent is. Likewise, it
* will use the relfilenode map if and only if the parent does; and it
* inherits the parent's relpersistence.
*/
namespaceId = RelationGetNamespace(heapRelation);
shared_relation = heapRelation->rd_rel->relisshared;
mapped_relation = RelationIsMapped(heapRelation);
relpersistence = heapRelation->rd_rel->relpersistence;
/*
* check parameters
*/
if (indexInfo->ii_NumIndexAttrs < 1)
elog(ERROR, "must index at least one column");
if (!allow_system_table_mods &&
IsSystemRelation(heapRelation) &&
IsNormalProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("user-defined indexes on system catalog tables are not supported")));
/*
* concurrent index build on a system catalog is unsafe because we tend to
* release locks before committing in catalogs
*/
if (concurrent &&
IsSystemRelation(heapRelation))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("concurrent index creation on system catalog tables is not supported")));
/*
* This case is currently not supported, but there's no way to ask for it
* in the grammar anyway, so it can't happen.
*/
if (concurrent && is_exclusion)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg_internal("concurrent index creation for exclusion constraints is not supported")));
/*
* We cannot allow indexing a shared relation after initdb (because
* there's no way to make the entry in other databases' pg_class).
*/
if (shared_relation && !IsBootstrapProcessingMode())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("shared indexes cannot be created after initdb")));
/*
* Shared relations must be in pg_global, too (last-ditch check)
*/
if (shared_relation && tableSpaceId != GLOBALTABLESPACE_OID)
elog(ERROR, "shared relations must be placed in pg_global tablespace");
if (get_relname_relid(indexRelationName, namespaceId))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists",
indexRelationName)));
/*
* construct tuple descriptor for index tuples
*/
indexTupDesc = ConstructTupleDescriptor(heapRelation,
indexInfo,
indexColNames,
accessMethodObjectId,
collationObjectId,
classObjectId);
/*
* Allocate an OID for the index, unless we were told what to use.
*
* The OID will be the relfilenode as well, so make sure it doesn't
* collide with either pg_class OIDs or existing physical files.
*/
if (!OidIsValid(indexRelationId))
{
/*
* Use binary-upgrade override for pg_class.oid/relfilenode, if
* supplied.
*/
if (IsBinaryUpgrade &&
OidIsValid(binary_upgrade_next_index_pg_class_oid))
{
indexRelationId = binary_upgrade_next_index_pg_class_oid;
binary_upgrade_next_index_pg_class_oid = InvalidOid;
}
else
{
indexRelationId =
GetNewRelFileNode(tableSpaceId, pg_class, relpersistence);
}
}
/*
* create the index relation's relcache entry and physical disk file. (If
* we fail further down, it's the smgr's responsibility to remove the disk
* file again.)
*/
indexRelation = heap_create(indexRelationName,
namespaceId,
tableSpaceId,
indexRelationId,
relFileNode,
indexTupDesc,
RELKIND_INDEX,
relpersistence,
shared_relation,
mapped_relation);
Assert(indexRelationId == RelationGetRelid(indexRelation));
/*
* Obtain exclusive lock on it. Although no other backends can see it
* until we commit, this prevents deadlock-risk complaints from lock
* manager in cases such as CLUSTER.
*/
LockRelation(indexRelation, AccessExclusiveLock);
/*
* Fill in fields of the index's pg_class entry that are not set correctly
* by heap_create.
*
* XXX should have a cleaner way to create cataloged indexes
*/
indexRelation->rd_rel->relowner = heapRelation->rd_rel->relowner;
indexRelation->rd_rel->relam = accessMethodObjectId;
indexRelation->rd_rel->relhasoids = false;
/*
* store index's pg_class entry
*/
InsertPgClassTuple(pg_class, indexRelation,
RelationGetRelid(indexRelation),
(Datum) 0,
reloptions);
/* done with pg_class */
heap_close(pg_class, RowExclusiveLock);
/*
* now update the object id's of all the attribute tuple forms in the
* index relation's tuple descriptor
*/
InitializeAttributeOids(indexRelation,
indexInfo->ii_NumIndexAttrs,
indexRelationId);
/*
* append ATTRIBUTE tuples for the index
*/
AppendAttributeTuples(indexRelation, indexInfo->ii_NumIndexAttrs);
/* ----------------
* update pg_index
* (append INDEX tuple)
*
* Note that this stows away a representation of "predicate".
* (Or, could define a rule to maintain the predicate) --Nels, Feb '92
* ----------------
*/
UpdateIndexRelation(indexRelationId, heapRelationId, indexInfo,
collationObjectId, classObjectId, coloptions,
isprimary, is_exclusion,
!deferrable,
!concurrent);
/*
* Register constraint and dependencies for the index.
*
* If the index is from a CONSTRAINT clause, construct a pg_constraint
* entry. The index will be linked to the constraint, which in turn is
* linked to the table. If it's not a CONSTRAINT, we need to make a
* dependency directly on the table.
*
* We don't need a dependency on the namespace, because there'll be an
* indirect dependency via our parent table.
*
* During bootstrap we can't register any dependencies, and we don't try
* to make a constraint either.
*/
if (!IsBootstrapProcessingMode())
{
ObjectAddress myself,
referenced;
myself.classId = RelationRelationId;
myself.objectId = indexRelationId;
myself.objectSubId = 0;
if (isconstraint)
{
char constraintType;
if (isprimary)
constraintType = CONSTRAINT_PRIMARY;
else if (indexInfo->ii_Unique)
constraintType = CONSTRAINT_UNIQUE;
else if (is_exclusion)
constraintType = CONSTRAINT_EXCLUSION;
else
{
elog(ERROR, "constraint must be PRIMARY, UNIQUE or EXCLUDE");
constraintType = 0; /* keep compiler quiet */
}
index_constraint_create(heapRelation,
indexRelationId,
indexInfo,
indexRelationName,
constraintType,
deferrable,
initdeferred,
false, /* already marked primary */
false, /* pg_index entry is OK */
false, /* no old dependencies */
allow_system_table_mods,
is_internal);
}
else
{
bool have_simple_col = false;
/* Create auto dependencies on simply-referenced columns */
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
if (indexInfo->ii_KeyAttrNumbers[i] != 0)
{
referenced.classId = RelationRelationId;
referenced.objectId = heapRelationId;
referenced.objectSubId = indexInfo->ii_KeyAttrNumbers[i];
recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
have_simple_col = true;
}
}
/*
* If there are no simply-referenced columns, give the index an
* auto dependency on the whole table. In most cases, this will
* be redundant, but it might not be if the index expressions and
* predicate contain no Vars or only whole-row Vars.
*/
if (!have_simple_col)
{
referenced.classId = RelationRelationId;
referenced.objectId = heapRelationId;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
}
/* Non-constraint indexes can't be deferrable */
Assert(!deferrable);
Assert(!initdeferred);
}
/* Store dependency on collations */
/* The default collation is pinned, so don't bother recording it */
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
if (OidIsValid(collationObjectId[i]) &&
collationObjectId[i] != DEFAULT_COLLATION_OID)
{
referenced.classId = CollationRelationId;
referenced.objectId = collationObjectId[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
/* Store dependency on operator classes */
for (i = 0; i < indexInfo->ii_NumIndexAttrs; i++)
{
referenced.classId = OperatorClassRelationId;
referenced.objectId = classObjectId[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
/* Store dependencies on anything mentioned in index expressions */
if (indexInfo->ii_Expressions)
{
recordDependencyOnSingleRelExpr(&myself,
(Node *) indexInfo->ii_Expressions,
heapRelationId,
DEPENDENCY_NORMAL,
DEPENDENCY_AUTO);
}
/* Store dependencies on anything mentioned in predicate */
if (indexInfo->ii_Predicate)
{
recordDependencyOnSingleRelExpr(&myself,
(Node *) indexInfo->ii_Predicate,
heapRelationId,
DEPENDENCY_NORMAL,
DEPENDENCY_AUTO);
}
}
else
{
/* Bootstrap mode - assert we weren't asked for constraint support */
Assert(!isconstraint);
Assert(!deferrable);
Assert(!initdeferred);
}
/* Post creation hook for new index */
InvokeObjectPostCreateHookArg(RelationRelationId,
indexRelationId, 0, is_internal);
/*
* Advance the command counter so that we can see the newly-entered
* catalog tuples for the index.
*/
CommandCounterIncrement();
/*
* In bootstrap mode, we have to fill in the index strategy structure with
* information from the catalogs. If we aren't bootstrapping, then the
* relcache entry has already been rebuilt thanks to sinval update during
* CommandCounterIncrement.
*/
if (IsBootstrapProcessingMode())
RelationInitIndexAccessInfo(indexRelation);
else
Assert(indexRelation->rd_indexcxt != NULL);
/*
* If this is bootstrap (initdb) time, then we don't actually fill in the
* index yet. We'll be creating more indexes and classes later, so we
* delay filling them in until just before we're done with bootstrapping.
* Similarly, if the caller specified skip_build then filling the index is
* delayed till later (ALTER TABLE can save work in some cases with this).
* Otherwise, we call the AM routine that constructs the index.
*/
if (IsBootstrapProcessingMode())
{
index_register(heapRelationId, indexRelationId, indexInfo);
}
else if (skip_build)
{
/*
* Caller is responsible for filling the index later on. However,
* we'd better make sure that the heap relation is correctly marked as
* having an index.
*/
index_update_stats(heapRelation,
true,
isprimary,
InvalidOid,
-1.0);
/* Make the above update visible */
CommandCounterIncrement();
}
else
{
index_build(heapRelation, indexRelation, indexInfo, isprimary, false);
}
/*
* Close the index; but we keep the lock that we acquired above until end
* of transaction. Closing the heap is caller's responsibility.
*/
index_close(indexRelation, NoLock);
return indexRelationId;
}
Definition at line 1317 of file index.c.
References AccessExclusiveLock, Anum_pg_index_indexprs, CacheInvalidateRelcache(), CheckTableNotInUse(), CommitTransactionCommand(), LockRelId::dbId, DeleteAttributeTuples(), DeleteRelationTuple(), elog, ereport, errcode(), errmsg(), ERROR, GetLockConflicts(), GetTopTransactionIdIfAny(), heap_attisnull(), heap_close, heap_open(), HeapTupleIsValid, index_close(), INDEX_DROP_CLEAR_VALID, INDEX_DROP_SET_DEAD, index_open(), index_set_state_flags(), IndexGetRelation(), IndexRelationId, INDEXRELID, InvalidTransactionId, LockRelationIdForSession(), LockInfoData::lockRelId, NoLock, ObjectIdGetDatum, PopActiveSnapshot(), RelationData::rd_lockInfo, RelationDropStorage(), RelationForgetRelation(), ReleaseSysCache(), LockRelId::relId, RemoveStatistics(), RowExclusiveLock, SearchSysCache1, SET_LOCKTAG_RELATION, ShareUpdateExclusiveLock, simple_heap_delete(), StartTransactionCommand(), HeapTupleData::t_self, TransferPredicateLocksToHeapRelation(), UnlockRelationIdForSession(), VirtualTransactionIdIsValid, and VirtualXactLock().
Referenced by doDeletion().
{
Oid heapId;
Relation userHeapRelation;
Relation userIndexRelation;
Relation indexRelation;
HeapTuple tuple;
bool hasexprs;
LockRelId heaprelid,
indexrelid;
LOCKTAG heaplocktag;
LOCKMODE lockmode;
VirtualTransactionId *old_lockholders;
/*
* To drop an index safely, we must grab exclusive lock on its parent
* table. Exclusive lock on the index alone is insufficient because
* another backend might be about to execute a query on the parent table.
* If it relies on a previously cached list of index OIDs, then it could
* attempt to access the just-dropped index. We must therefore take a
* table lock strong enough to prevent all queries on the table from
* proceeding until we commit and send out a shared-cache-inval notice
* that will make them update their index lists.
*
* In the concurrent case we avoid this requirement by disabling index use
* in multiple steps and waiting out any transactions that might be using
* the index, so we don't need exclusive lock on the parent table. Instead
* we take ShareUpdateExclusiveLock, to ensure that two sessions aren't
* doing CREATE/DROP INDEX CONCURRENTLY on the same index. (We will get
* AccessExclusiveLock on the index below, once we're sure nobody else is
* using it.)
*/
heapId = IndexGetRelation(indexId, false);
lockmode = concurrent ? ShareUpdateExclusiveLock : AccessExclusiveLock;
userHeapRelation = heap_open(heapId, lockmode);
userIndexRelation = index_open(indexId, lockmode);
/*
* We might still have open queries using it in our own session, which the
* above locking won't prevent, so test explicitly.
*/
CheckTableNotInUse(userIndexRelation, "DROP INDEX");
/*
* Drop Index Concurrently is more or less the reverse process of Create
* Index Concurrently.
*
* First we unset indisvalid so queries starting afterwards don't use the
* index to answer queries anymore. We have to keep indisready = true so
* transactions that are still scanning the index can continue to see
* valid index contents. For instance, if they are using READ COMMITTED
* mode, and another transaction makes changes and commits, they need to
* see those new tuples in the index.
*
* After all transactions that could possibly have used the index for
* queries end, we can unset indisready and indislive, then wait till
* nobody could be touching it anymore. (Note: we need indislive because
* this state must be distinct from the initial state during CREATE INDEX
* CONCURRENTLY, which has indislive true while indisready and indisvalid
* are false. That's because in that state, transactions must examine the
* index for HOT-safety decisions, while in this state we don't want them
* to open it at all.)
*
* Since all predicate locks on the index are about to be made invalid, we
* must promote them to predicate locks on the heap. In the
* non-concurrent case we can just do that now. In the concurrent case
* it's a bit trickier. The predicate locks must be moved when there are
* no index scans in progress on the index and no more can subsequently
* start, so that no new predicate locks can be made on the index. Also,
* they must be moved before heap inserts stop maintaining the index, else
* the conflict with the predicate lock on the index gap could be missed
* before the lock on the heap relation is in place to detect a conflict
* based on the heap tuple insert.
*/
if (concurrent)
{
/*
* We must commit our transaction in order to make the first pg_index
* state update visible to other sessions. If the DROP machinery has
* already performed any other actions (removal of other objects,
* pg_depend entries, etc), the commit would make those actions
* permanent, which would leave us with inconsistent catalog state if
* we fail partway through the following sequence. Since DROP INDEX
* CONCURRENTLY is restricted to dropping just one index that has no
* dependencies, we should get here before anything's been done ---
* but let's check that to be sure. We can verify that the current
* transaction has not executed any transactional updates by checking
* that no XID has been assigned.
*/
if (GetTopTransactionIdIfAny() != InvalidTransactionId)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("DROP INDEX CONCURRENTLY must be first action in transaction")));
/*
* Mark index invalid by updating its pg_index entry
*/
index_set_state_flags(indexId, INDEX_DROP_CLEAR_VALID);
/*
* Invalidate the relcache for the table, so that after this commit
* all sessions will refresh any cached plans that might reference the
* index.
*/
CacheInvalidateRelcache(userHeapRelation);
/* save lockrelid and locktag for below, then close but keep locks */
heaprelid = userHeapRelation->rd_lockInfo.lockRelId;
SET_LOCKTAG_RELATION(heaplocktag, heaprelid.dbId, heaprelid.relId);
indexrelid = userIndexRelation->rd_lockInfo.lockRelId;
heap_close(userHeapRelation, NoLock);
index_close(userIndexRelation, NoLock);
/*
* We must commit our current transaction so that the indisvalid
* update becomes visible to other transactions; then start another.
* Note that any previously-built data structures are lost in the
* commit. The only data we keep past here are the relation IDs.
*
* Before committing, get a session-level lock on the table, to ensure
* that neither it nor the index can be dropped before we finish. This
* cannot block, even if someone else is waiting for access, because
* we already have the same lock within our transaction.
*/
LockRelationIdForSession(&heaprelid, ShareUpdateExclusiveLock);
LockRelationIdForSession(&indexrelid, ShareUpdateExclusiveLock);
PopActiveSnapshot();
CommitTransactionCommand();
StartTransactionCommand();
/*
* Now we must wait until no running transaction could be using the
* index for a query. To do this, inquire which xacts currently would
* conflict with AccessExclusiveLock on the table -- ie, which ones
* have a lock of any kind on the table. Then wait for each of these
* xacts to commit or abort. Note we do not need to worry about xacts
* that open the table for reading after this point; they will see the
* index as invalid when they open the relation.
*
* Note: the reason we use actual lock acquisition here, rather than
* just checking the ProcArray and sleeping, is that deadlock is
* possible if one of the transactions in question is blocked trying
* to acquire an exclusive lock on our table. The lock code will
* detect deadlock and error out properly.
*
* Note: GetLockConflicts() never reports our own xid, hence we need
* not check for that. Also, prepared xacts are not reported, which
* is fine since they certainly aren't going to do anything more.
*/
old_lockholders = GetLockConflicts(&heaplocktag, AccessExclusiveLock);
while (VirtualTransactionIdIsValid(*old_lockholders))
{
VirtualXactLock(*old_lockholders, true);
old_lockholders++;
}
/*
* No more predicate locks will be acquired on this index, and we're
* about to stop doing inserts into the index which could show
* conflicts with existing predicate locks, so now is the time to move
* them to the heap relation.
*/
userHeapRelation = heap_open(heapId, ShareUpdateExclusiveLock);
userIndexRelation = index_open(indexId, ShareUpdateExclusiveLock);
TransferPredicateLocksToHeapRelation(userIndexRelation);
/*
* Now we are sure that nobody uses the index for queries; they just
* might have it open for updating it. So now we can unset indisready
* and indislive, then wait till nobody could be using it at all
* anymore.
*/
index_set_state_flags(indexId, INDEX_DROP_SET_DEAD);
/*
* Invalidate the relcache for the table, so that after this commit
* all sessions will refresh the table's index list. Forgetting just
* the index's relcache entry is not enough.
*/
CacheInvalidateRelcache(userHeapRelation);
/*
* Close the relations again, though still holding session lock.
*/
heap_close(userHeapRelation, NoLock);
index_close(userIndexRelation, NoLock);
/*
* Again, commit the transaction to make the pg_index update visible
* to other sessions.
*/
CommitTransactionCommand();
StartTransactionCommand();
/*
* Wait till every transaction that saw the old index state has
* finished. The logic here is the same as above.
*/
old_lockholders = GetLockConflicts(&heaplocktag, AccessExclusiveLock);
while (VirtualTransactionIdIsValid(*old_lockholders))
{
VirtualXactLock(*old_lockholders, true);
old_lockholders++;
}
/*
* Re-open relations to allow us to complete our actions.
*
* At this point, nothing should be accessing the index, but lets
* leave nothing to chance and grab AccessExclusiveLock on the index
* before the physical deletion.
*/
userHeapRelation = heap_open(heapId, ShareUpdateExclusiveLock);
userIndexRelation = index_open(indexId, AccessExclusiveLock);
}
else
{
/* Not concurrent, so just transfer predicate locks and we're good */
TransferPredicateLocksToHeapRelation(userIndexRelation);
}
/*
* Schedule physical removal of the files
*/
RelationDropStorage(userIndexRelation);
/*
* Close and flush the index's relcache entry, to ensure relcache doesn't
* try to rebuild it while we're deleting catalog entries. We keep the
* lock though.
*/
index_close(userIndexRelation, NoLock);
RelationForgetRelation(indexId);
/*
* fix INDEX relation, and check for expressional index
*/
indexRelation = heap_open(IndexRelationId, RowExclusiveLock);
tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
hasexprs = !heap_attisnull(tuple, Anum_pg_index_indexprs);
simple_heap_delete(indexRelation, &tuple->t_self);
ReleaseSysCache(tuple);
heap_close(indexRelation, RowExclusiveLock);
/*
* if it has any expression columns, we might have stored statistics about
* them.
*/
if (hasexprs)
RemoveStatistics(indexId, 0);
/*
* fix ATTRIBUTE relation
*/
DeleteAttributeTuples(indexId);
/*
* fix RELATION relation
*/
DeleteRelationTuple(indexId);
/*
* We are presently too lazy to attempt to compute the new correct value
* of relhasindex (the next VACUUM will fix it if necessary). So there is
* no need to update the pg_class tuple for the owning relation. But we
* must send out a shared-cache-inval notice on the owning relation to
* ensure other backends update their relcache lists of indexes. (In the
* concurrent case, this is redundant but harmless.)
*/
CacheInvalidateRelcache(userHeapRelation);
/*
* Close owning rel, but keep lock
*/
heap_close(userHeapRelation, NoLock);
/*
* Release the session locks before we go.
*/
if (concurrent)
{
UnlockRelationIdForSession(&heaprelid, ShareUpdateExclusiveLock);
UnlockRelationIdForSession(&indexrelid, ShareUpdateExclusiveLock);
}
}
| void index_set_state_flags | ( | Oid | indexId, | |
| IndexStateFlagsAction | action | |||
| ) |
Definition at line 3021 of file index.c.
References Assert, elog, ERROR, GETSTRUCT, GetTopTransactionIdIfAny(), heap_close, heap_inplace_update(), heap_open(), HeapTupleIsValid, INDEX_CREATE_SET_READY, INDEX_CREATE_SET_VALID, INDEX_DROP_CLEAR_VALID, INDEX_DROP_SET_DEAD, IndexRelationId, INDEXRELID, InvalidTransactionId, ObjectIdGetDatum, RowExclusiveLock, and SearchSysCacheCopy1.
Referenced by DefineIndex(), and index_drop().
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
/* Assert that current xact hasn't done any transactional updates */
Assert(GetTopTransactionIdIfAny() == InvalidTransactionId);
/* Open pg_index and fetch a writable copy of the index's tuple */
pg_index = heap_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
/* Perform the requested state change on the copy */
switch (action)
{
case INDEX_CREATE_SET_READY:
/* Set indisready during a CREATE INDEX CONCURRENTLY sequence */
Assert(indexForm->indislive);
Assert(!indexForm->indisready);
Assert(!indexForm->indisvalid);
indexForm->indisready = true;
break;
case INDEX_CREATE_SET_VALID:
/* Set indisvalid during a CREATE INDEX CONCURRENTLY sequence */
Assert(indexForm->indislive);
Assert(indexForm->indisready);
Assert(!indexForm->indisvalid);
indexForm->indisvalid = true;
break;
case INDEX_DROP_CLEAR_VALID:
/*
* Clear indisvalid during a DROP INDEX CONCURRENTLY sequence
*
* If indisready == true we leave it set so the index still gets
* maintained by active transactions. We only need to ensure that
* indisvalid is false. (We don't assert that either is initially
* true, though, since we want to be able to retry a DROP INDEX
* CONCURRENTLY that failed partway through.)
*
* Note: the CLUSTER logic assumes that indisclustered cannot be
* set on any invalid index, so clear that flag too.
*/
indexForm->indisvalid = false;
indexForm->indisclustered = false;
break;
case INDEX_DROP_SET_DEAD:
/*
* Clear indisready/indislive during DROP INDEX CONCURRENTLY
*
* We clear both indisready and indislive, because we not only
* want to stop updates, we want to prevent sessions from touching
* the index at all.
*/
Assert(!indexForm->indisvalid);
indexForm->indisready = false;
indexForm->indislive = false;
break;
}
/* ... and write it back in-place */
heap_inplace_update(pg_index, indexTuple);
heap_close(pg_index, RowExclusiveLock);
}
| double IndexBuildHeapScan | ( | Relation | heapRelation, | |
| Relation | indexRelation, | |||
| IndexInfo * | indexInfo, | |||
| bool | allow_sync, | |||
| IndexBuildCallback | callback, | |||
| void * | callback_state | |||
| ) |
Definition at line 2128 of file index.c.
References Assert, BUFFER_LOCK_SHARE, BUFFER_LOCK_UNLOCK, BufferGetPage, callback(), CHECK_FOR_INTERRUPTS, CreateExecutorState(), ExprContext::ecxt_per_tuple_memory, ExprContext::ecxt_scantuple, elog, ERROR, ExecDropSingleTupleTableSlot(), ExecPrepareExpr(), ExecQual(), ExecStoreTuple(), FormIndexDatum(), ForwardScanDirection, FreeExecutorState(), GetOldestXmin(), GetPerTupleExprContext, GetTransactionSnapshot(), heap_beginscan_strat(), heap_endscan(), heap_get_root_tuples(), heap_getnext(), HEAPTUPLE_DEAD, HEAPTUPLE_DELETE_IN_PROGRESS, HEAPTUPLE_INSERT_IN_PROGRESS, HEAPTUPLE_LIVE, HEAPTUPLE_RECENTLY_DEAD, HeapTupleHeaderGetUpdateXid, HeapTupleHeaderGetXmin, HeapTupleIsHeapOnly, HeapTupleIsHotUpdated, HeapTupleSatisfiesVacuum(), IndexInfo::ii_BrokenHotChain, IndexInfo::ii_Concurrent, IndexInfo::ii_ExclusionOps, IndexInfo::ii_ExpressionsState, IndexInfo::ii_Predicate, IndexInfo::ii_PredicateState, IndexInfo::ii_Unique, InvalidBuffer, IsBootstrapProcessingMode, IsSystemRelation(), ItemPointerGetOffsetNumber, ItemPointerSetOffsetNumber, LockBuffer(), MakeSingleTupleTableSlot(), MemoryContextReset(), NIL, NULL, OffsetNumberIsValid, OidIsValid, OldestXmin, RelationData::rd_rel, RegisterSnapshot(), RelationGetDescr, RelationGetRelationName, HeapScanDescData::rs_cblock, HeapScanDescData::rs_cbuf, SnapshotAny, HeapTupleData::t_data, HeapTupleData::t_self, TransactionIdIsCurrentTransactionId(), UnregisterSnapshot(), values, WARNING, and XactLockTableWait().
Referenced by btbuild(), ginbuild(), gistbuild(), hashbuild(), and spgbuild().
{
bool is_system_catalog;
bool checking_uniqueness;
HeapScanDesc scan;
HeapTuple heapTuple;
Datum values[INDEX_MAX_KEYS];
bool isnull[INDEX_MAX_KEYS];
double reltuples;
List *predicate;
TupleTableSlot *slot;
EState *estate;
ExprContext *econtext;
Snapshot snapshot;
TransactionId OldestXmin;
BlockNumber root_blkno = InvalidBlockNumber;
OffsetNumber root_offsets[MaxHeapTuplesPerPage];
/*
* sanity checks
*/
Assert(OidIsValid(indexRelation->rd_rel->relam));
/* Remember if it's a system catalog */
is_system_catalog = IsSystemRelation(heapRelation);
/* See whether we're verifying uniqueness/exclusion properties */
checking_uniqueness = (indexInfo->ii_Unique ||
indexInfo->ii_ExclusionOps != NULL);
/*
* Need an EState for evaluation of index expressions and partial-index
* predicates. Also a slot to hold the current tuple.
*/
estate = CreateExecutorState();
econtext = GetPerTupleExprContext(estate);
slot = MakeSingleTupleTableSlot(RelationGetDescr(heapRelation));
/* Arrange for econtext's scan tuple to be the tuple under test */
econtext->ecxt_scantuple = slot;
/* Set up execution state for predicate, if any. */
predicate = (List *)
ExecPrepareExpr((Expr *) indexInfo->ii_Predicate,
estate);
/*
* Prepare for scan of the base relation. In a normal index build, we use
* SnapshotAny because we must retrieve all tuples and do our own time
* qual checks (because we have to index RECENTLY_DEAD tuples). In a
* concurrent build, we take a regular MVCC snapshot and index whatever's
* live according to that. During bootstrap we just use SnapshotNow.
*/
if (IsBootstrapProcessingMode())
{
snapshot = SnapshotNow;
OldestXmin = InvalidTransactionId; /* not used */
}
else if (indexInfo->ii_Concurrent)
{
snapshot = RegisterSnapshot(GetTransactionSnapshot());
OldestXmin = InvalidTransactionId; /* not used */
}
else
{
snapshot = SnapshotAny;
/* okay to ignore lazy VACUUMs here */
OldestXmin = GetOldestXmin(heapRelation->rd_rel->relisshared, true);
}
scan = heap_beginscan_strat(heapRelation, /* relation */
snapshot, /* snapshot */
0, /* number of keys */
NULL, /* scan key */
true, /* buffer access strategy OK */
allow_sync); /* syncscan OK? */
reltuples = 0;
/*
* Scan all tuples in the base relation.
*/
while ((heapTuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
bool tupleIsAlive;
CHECK_FOR_INTERRUPTS();
/*
* When dealing with a HOT-chain of updated tuples, we want to index
* the values of the live tuple (if any), but index it under the TID
* of the chain's root tuple. This approach is necessary to preserve
* the HOT-chain structure in the heap. So we need to be able to find
* the root item offset for every tuple that's in a HOT-chain. When
* first reaching a new page of the relation, call
* heap_get_root_tuples() to build a map of root item offsets on the
* page.
*
* It might look unsafe to use this information across buffer
* lock/unlock. However, we hold ShareLock on the table so no
* ordinary insert/update/delete should occur; and we hold pin on the
* buffer continuously while visiting the page, so no pruning
* operation can occur either.
*
* Also, although our opinions about tuple liveness could change while
* we scan the page (due to concurrent transaction commits/aborts),
* the chain root locations won't, so this info doesn't need to be
* rebuilt after waiting for another transaction.
*
* Note the implied assumption that there is no more than one live
* tuple per HOT-chain --- else we could create more than one index
* entry pointing to the same root tuple.
*/
if (scan->rs_cblock != root_blkno)
{
Page page = BufferGetPage(scan->rs_cbuf);
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE);
heap_get_root_tuples(page, root_offsets);
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
root_blkno = scan->rs_cblock;
}
if (snapshot == SnapshotAny)
{
/* do our own time qual check */
bool indexIt;
TransactionId xwait;
recheck:
/*
* We could possibly get away with not locking the buffer here,
* since caller should hold ShareLock on the relation, but let's
* be conservative about it. (This remark is still correct even
* with HOT-pruning: our pin on the buffer prevents pruning.)
*/
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE);
switch (HeapTupleSatisfiesVacuum(heapTuple->t_data, OldestXmin,
scan->rs_cbuf))
{
case HEAPTUPLE_DEAD:
/* Definitely dead, we can ignore it */
indexIt = false;
tupleIsAlive = false;
break;
case HEAPTUPLE_LIVE:
/* Normal case, index and unique-check it */
indexIt = true;
tupleIsAlive = true;
break;
case HEAPTUPLE_RECENTLY_DEAD:
/*
* If tuple is recently deleted then we must index it
* anyway to preserve MVCC semantics. (Pre-existing
* transactions could try to use the index after we finish
* building it, and may need to see such tuples.)
*
* However, if it was HOT-updated then we must only index
* the live tuple at the end of the HOT-chain. Since this
* breaks semantics for pre-existing snapshots, mark the
* index as unusable for them.
*/
if (HeapTupleIsHotUpdated(heapTuple))
{
indexIt = false;
/* mark the index as unsafe for old snapshots */
indexInfo->ii_BrokenHotChain = true;
}
else
indexIt = true;
/* In any case, exclude the tuple from unique-checking */
tupleIsAlive = false;
break;
case HEAPTUPLE_INSERT_IN_PROGRESS:
/*
* Since caller should hold ShareLock or better, normally
* the only way to see this is if it was inserted earlier
* in our own transaction. However, it can happen in
* system catalogs, since we tend to release write lock
* before commit there. Give a warning if neither case
* applies.
*/
xwait = HeapTupleHeaderGetXmin(heapTuple->t_data);
if (!TransactionIdIsCurrentTransactionId(xwait))
{
if (!is_system_catalog)
elog(WARNING, "concurrent insert in progress within table \"%s\"",
RelationGetRelationName(heapRelation));
/*
* If we are performing uniqueness checks, indexing
* such a tuple could lead to a bogus uniqueness
* failure. In that case we wait for the inserting
* transaction to finish and check again.
*/
if (checking_uniqueness)
{
/*
* Must drop the lock on the buffer before we wait
*/
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
XactLockTableWait(xwait);
goto recheck;
}
}
/*
* We must index such tuples, since if the index build
* commits then they're good.
*/
indexIt = true;
tupleIsAlive = true;
break;
case HEAPTUPLE_DELETE_IN_PROGRESS:
/*
* As with INSERT_IN_PROGRESS case, this is unexpected
* unless it's our own deletion or a system catalog.
*/
xwait = HeapTupleHeaderGetUpdateXid(heapTuple->t_data);
if (!TransactionIdIsCurrentTransactionId(xwait))
{
if (!is_system_catalog)
elog(WARNING, "concurrent delete in progress within table \"%s\"",
RelationGetRelationName(heapRelation));
/*
* If we are performing uniqueness checks, assuming
* the tuple is dead could lead to missing a
* uniqueness violation. In that case we wait for the
* deleting transaction to finish and check again.
*
* Also, if it's a HOT-updated tuple, we should not
* index it but rather the live tuple at the end of
* the HOT-chain. However, the deleting transaction
* could abort, possibly leaving this tuple as live
* after all, in which case it has to be indexed. The
* only way to know what to do is to wait for the
* deleting transaction to finish and check again.
*/
if (checking_uniqueness ||
HeapTupleIsHotUpdated(heapTuple))
{
/*
* Must drop the lock on the buffer before we wait
*/
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
XactLockTableWait(xwait);
goto recheck;
}
/*
* Otherwise index it but don't check for uniqueness,
* the same as a RECENTLY_DEAD tuple.
*/
indexIt = true;
}
else if (HeapTupleIsHotUpdated(heapTuple))
{
/*
* It's a HOT-updated tuple deleted by our own xact.
* We can assume the deletion will commit (else the
* index contents don't matter), so treat the same as
* RECENTLY_DEAD HOT-updated tuples.
*/
indexIt = false;
/* mark the index as unsafe for old snapshots */
indexInfo->ii_BrokenHotChain = true;
}
else
{
/*
* It's a regular tuple deleted by our own xact. Index
* it but don't check for uniqueness, the same as a
* RECENTLY_DEAD tuple.
*/
indexIt = true;
}
/* In any case, exclude the tuple from unique-checking */
tupleIsAlive = false;
break;
default:
elog(ERROR, "unexpected HeapTupleSatisfiesVacuum result");
indexIt = tupleIsAlive = false; /* keep compiler quiet */
break;
}
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
if (!indexIt)
continue;
}
else
{
/* heap_getnext did the time qual check */
tupleIsAlive = true;
}
reltuples += 1;
MemoryContextReset(econtext->ecxt_per_tuple_memory);
/* Set up for predicate or expression evaluation */
ExecStoreTuple(heapTuple, slot, InvalidBuffer, false);
/*
* In a partial index, discard tuples that don't satisfy the
* predicate.
*/
if (predicate != NIL)
{
if (!ExecQual(predicate, econtext, false))
continue;
}
/*
* For the current heap tuple, extract all the attributes we use in
* this index, and note which are null. This also performs evaluation
* of any expressions needed.
*/
FormIndexDatum(indexInfo,
slot,
estate,
values,
isnull);
/*
* You'd think we should go ahead and build the index tuple here, but
* some index AMs want to do further processing on the data first. So
* pass the values[] and isnull[] arrays, instead.
*/
if (HeapTupleIsHeapOnly(heapTuple))
{
/*
* For a heap-only tuple, pretend its TID is that of the root. See
* src/backend/access/heap/README.HOT for discussion.
*/
HeapTupleData rootTuple;
OffsetNumber offnum;
rootTuple = *heapTuple;
offnum = ItemPointerGetOffsetNumber(&heapTuple->t_self);
Assert(OffsetNumberIsValid(root_offsets[offnum - 1]));
ItemPointerSetOffsetNumber(&rootTuple.t_self,
root_offsets[offnum - 1]);
/* Call the AM's callback routine to process the tuple */
callback(indexRelation, &rootTuple, values, isnull, tupleIsAlive,
callback_state);
}
else
{
/* Call the AM's callback routine to process the tuple */
callback(indexRelation, heapTuple, values, isnull, tupleIsAlive,
callback_state);
}
}
heap_endscan(scan);
/* we can now forget our snapshot, if set */
if (indexInfo->ii_Concurrent)
UnregisterSnapshot(snapshot);
ExecDropSingleTupleTableSlot(slot);
FreeExecutorState(estate);
/* These may have been pointing to the now-gone estate */
indexInfo->ii_ExpressionsState = NIL;
indexInfo->ii_PredicateState = NIL;
return reltuples;
}
Definition at line 3100 of file index.c.
References Assert, elog, ERROR, GETSTRUCT, HeapTupleIsValid, INDEXRELID, ObjectIdGetDatum, ReleaseSysCache(), and SearchSysCache1.
Referenced by index_drop(), RangeVarCallbackForDropRelation(), RangeVarCallbackForReindexIndex(), and reindex_index().
{
HeapTuple tuple;
Form_pg_index index;
Oid result;
tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(tuple))
{
if (missing_ok)
return InvalidOid;
elog(ERROR, "cache lookup failed for index %u", indexId);
}
index = (Form_pg_index) GETSTRUCT(tuple);
Assert(index->indexrelid == indexId);
result = index->indrelid;
ReleaseSysCache(tuple);
return result;
}
Definition at line 3125 of file index.c.
References AccessExclusiveLock, BuildIndexInfo(), CacheInvalidateRelcache(), CatalogUpdateIndexes(), CheckTableNotInUse(), elog, ereport, errcode(), errmsg(), ERROR, GETSTRUCT, heap_close, heap_open(), HeapTupleIsValid, IndexInfo::ii_BrokenHotChain, IndexInfo::ii_ExclusionOps, IndexInfo::ii_ExclusionProcs, IndexInfo::ii_ExclusionStrats, IndexInfo::ii_Unique, index_build(), index_close(), index_open(), IndexGetRelation(), IndexRelationId, INDEXRELID, InvalidMultiXactId, InvalidTransactionId, NoLock, NULL, ObjectIdGetDatum, PG_CATCH, PG_END_TRY, PG_RE_THROW, PG_TRY, RELATION_IS_OTHER_TEMP, RelationSetNewRelfilenode(), ResetReindexProcessing(), RowExclusiveLock, SearchSysCacheCopy1, SetReindexProcessing(), ShareLock, simple_heap_update(), HeapTupleData::t_self, and TransferPredicateLocksToHeapRelation().
Referenced by reindex_relation(), and ReindexIndex().
{
Relation iRel,
heapRelation;
Oid heapId;
IndexInfo *indexInfo;
volatile bool skipped_constraint = false;
/*
* Open and lock the parent heap relation. ShareLock is sufficient since
* we only need to be sure no schema or data changes are going on.
*/
heapId = IndexGetRelation(indexId, false);
heapRelation = heap_open(heapId, ShareLock);
/*
* Open the target index relation and get an exclusive lock on it, to
* ensure that no one else is touching this particular index.
*/
iRel = index_open(indexId, AccessExclusiveLock);
/*
* Don't allow reindex on temp tables of other backends ... their local
* buffer manager is not going to cope.
*/
if (RELATION_IS_OTHER_TEMP(iRel))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot reindex temporary tables of other sessions")));
/*
* Also check for active uses of the index in the current transaction; we
* don't want to reindex underneath an open indexscan.
*/
CheckTableNotInUse(iRel, "REINDEX INDEX");
/*
* All predicate locks on the index are about to be made invalid. Promote
* them to relation locks on the heap.
*/
TransferPredicateLocksToHeapRelation(iRel);
PG_TRY();
{
/* Suppress use of the target index while rebuilding it */
SetReindexProcessing(heapId, indexId);
/* Fetch info needed for index_build */
indexInfo = BuildIndexInfo(iRel);
/* If requested, skip checking uniqueness/exclusion constraints */
if (skip_constraint_checks)
{
if (indexInfo->ii_Unique || indexInfo->ii_ExclusionOps != NULL)
skipped_constraint = true;
indexInfo->ii_Unique = false;
indexInfo->ii_ExclusionOps = NULL;
indexInfo->ii_ExclusionProcs = NULL;
indexInfo->ii_ExclusionStrats = NULL;
}
/* We'll build a new physical relation for the index */
RelationSetNewRelfilenode(iRel, InvalidTransactionId,
InvalidMultiXactId);
/* Initialize the index and rebuild */
/* Note: we do not need to re-establish pkey setting */
index_build(heapRelation, iRel, indexInfo, false, true);
}
PG_CATCH();
{
/* Make sure flag gets cleared on error exit */
ResetReindexProcessing();
PG_RE_THROW();
}
PG_END_TRY();
ResetReindexProcessing();
/*
* If the index is marked invalid/not-ready/dead (ie, it's from a failed
* CREATE INDEX CONCURRENTLY, or a DROP INDEX CONCURRENTLY failed midway),
* and we didn't skip a uniqueness check, we can now mark it valid. This
* allows REINDEX to be used to clean up in such cases.
*
* We can also reset indcheckxmin, because we have now done a
* non-concurrent index build, *except* in the case where index_build
* found some still-broken HOT chains. If it did, and we don't have to
* change any of the other flags, we just leave indcheckxmin alone (note
* that index_build won't have changed it, because this is a reindex).
* This is okay and desirable because not updating the tuple leaves the
* index's usability horizon (recorded as the tuple's xmin value) the same
* as it was.
*
* But, if the index was invalid/not-ready/dead and there were broken HOT
* chains, we had better force indcheckxmin true, because the normal
* argument that the HOT chains couldn't conflict with the index is
* suspect for an invalid index. (A conflict is definitely possible if
* the index was dead. It probably shouldn't happen otherwise, but let's
* be conservative.) In this case advancing the usability horizon is
* appropriate.
*
* Note that if we have to update the tuple, there is a risk of concurrent
* transactions not seeing it during their SnapshotNow scans of pg_index.
* While not especially desirable, this is safe because no such
* transaction could be trying to update the table (since we have
* ShareLock on it). The worst case is that someone might transiently
* fail to use the index for a query --- but it was probably unusable
* before anyway, if we are updating the tuple.
*
* Another reason for avoiding unnecessary updates here is that while
* reindexing pg_index itself, we must not try to update tuples in it.
* pg_index's indexes should always have these flags in their clean state,
* so that won't happen.
*/
if (!skipped_constraint)
{
Relation pg_index;
HeapTuple indexTuple;
Form_pg_index indexForm;
bool index_bad;
pg_index = heap_open(IndexRelationId, RowExclusiveLock);
indexTuple = SearchSysCacheCopy1(INDEXRELID,
ObjectIdGetDatum(indexId));
if (!HeapTupleIsValid(indexTuple))
elog(ERROR, "cache lookup failed for index %u", indexId);
indexForm = (Form_pg_index) GETSTRUCT(indexTuple);
index_bad = (!indexForm->indisvalid ||
!indexForm->indisready ||
!indexForm->indislive);
if (index_bad ||
(indexForm->indcheckxmin && !indexInfo->ii_BrokenHotChain))
{
if (!indexInfo->ii_BrokenHotChain)
indexForm->indcheckxmin = false;
else if (index_bad)
indexForm->indcheckxmin = true;
indexForm->indisvalid = true;
indexForm->indisready = true;
indexForm->indislive = true;
simple_heap_update(pg_index, &indexTuple->t_self, indexTuple);
CatalogUpdateIndexes(pg_index, indexTuple);
/*
* Invalidate the relcache for the table, so that after we commit
* all sessions will refresh the table's index list. This ensures
* that if anyone misses seeing the pg_index row during this
* update, they'll refresh their list before attempting any update
* on the table.
*/
CacheInvalidateRelcache(heapRelation);
}
heap_close(pg_index, RowExclusiveLock);
}
/* Close rels, but keep locks */
index_close(iRel, NoLock);
heap_close(heapRelation, NoLock);
}
Definition at line 3318 of file index.c.
References Assert, ClassOidIndexId, CommandCounterIncrement(), heap_close, heap_open(), InvalidOid, lappend_oid(), lfirst_oid, NoLock, OidIsValid, PG_CATCH, PG_END_TRY, PG_RE_THROW, PG_TRY, RelationData::rd_rel, reindex_index(), REINDEX_REL_CHECK_CONSTRAINTS, REINDEX_REL_PROCESS_TOAST, REINDEX_REL_SUPPRESS_INDEX_USE, reindex_relation(), ReindexIsProcessingIndex(), RelationGetIndexAttrBitmap(), RelationGetIndexList(), RelationGetRelid, RelationSetIndexList(), ResetReindexPending(), SetReindexPending(), and ShareLock.
Referenced by ExecuteTruncate(), finish_heap_swap(), reindex_relation(), ReindexDatabase(), and ReindexTable().
{
Relation rel;
Oid toast_relid;
List *indexIds;
bool is_pg_class;
bool result;
/*
* Open and lock the relation. ShareLock is sufficient since we only need
* to prevent schema and data changes in it. The lock level used here
* should match ReindexTable().
*/
rel = heap_open(relid, ShareLock);
toast_relid = rel->rd_rel->reltoastrelid;
/*
* Get the list of index OIDs for this relation. (We trust to the
* relcache to get this with a sequential scan if ignoring system
* indexes.)
*/
indexIds = RelationGetIndexList(rel);
/*
* reindex_index will attempt to update the pg_class rows for the relation
* and index. If we are processing pg_class itself, we want to make sure
* that the updates do not try to insert index entries into indexes we
* have not processed yet. (When we are trying to recover from corrupted
* indexes, that could easily cause a crash.) We can accomplish this
* because CatalogUpdateIndexes will use the relcache's index list to know
* which indexes to update. We just force the index list to be only the
* stuff we've processed.
*
* It is okay to not insert entries into the indexes we have not processed
* yet because all of this is transaction-safe. If we fail partway
* through, the updated rows are dead and it doesn't matter whether they
* have index entries. Also, a new pg_class index will be created with a
* correct entry for its own pg_class row because we do
* RelationSetNewRelfilenode() before we do index_build().
*
* Note that we also clear pg_class's rd_oidindex until the loop is done,
* so that that index can't be accessed either. This means we cannot
* safely generate new relation OIDs while in the loop; shouldn't be a
* problem.
*/
is_pg_class = (RelationGetRelid(rel) == RelationRelationId);
/* Ensure rd_indexattr is valid; see comments for RelationSetIndexList */
if (is_pg_class)
(void) RelationGetIndexAttrBitmap(rel, false);
PG_TRY();
{
List *doneIndexes;
ListCell *indexId;
if (flags & REINDEX_REL_SUPPRESS_INDEX_USE)
{
/* Suppress use of all the indexes until they are rebuilt */
SetReindexPending(indexIds);
/*
* Make the new heap contents visible --- now things might be
* inconsistent!
*/
CommandCounterIncrement();
}
/* Reindex all the indexes. */
doneIndexes = NIL;
foreach(indexId, indexIds)
{
Oid indexOid = lfirst_oid(indexId);
if (is_pg_class)
RelationSetIndexList(rel, doneIndexes, InvalidOid);
reindex_index(indexOid, !(flags & REINDEX_REL_CHECK_CONSTRAINTS));
CommandCounterIncrement();
/* Index should no longer be in the pending list */
Assert(!ReindexIsProcessingIndex(indexOid));
if (is_pg_class)
doneIndexes = lappend_oid(doneIndexes, indexOid);
}
}
PG_CATCH();
{
/* Make sure list gets cleared on error exit */
ResetReindexPending();
PG_RE_THROW();
}
PG_END_TRY();
ResetReindexPending();
if (is_pg_class)
RelationSetIndexList(rel, indexIds, ClassOidIndexId);
/*
* Close rel, but continue to hold the lock.
*/
heap_close(rel, NoLock);
result = (indexIds != NIL);
/*
* If the relation has a secondary toast rel, reindex that too while we
* still hold the lock on the master table.
*/
if ((flags & REINDEX_REL_PROCESS_TOAST) && OidIsValid(toast_relid))
result |= reindex_relation(toast_relid, flags);
return result;
}
Definition at line 3456 of file index.c.
References currentlyReindexedHeap.
Referenced by index_update_stats().
{
return heapOid == currentlyReindexedHeap;
}
Definition at line 3477 of file index.c.
References currentlyReindexedIndex, and list_member_oid().
Referenced by reindex_relation(), systable_beginscan(), and systable_beginscan_ordered().
{
return indexOid == currentlyReindexedIndex ||
list_member_oid(pendingReindexedIndexes, indexOid);
}
Definition at line 2689 of file index.c.
References IndexVacuumInfo::analyze_only, AtEOXact_GUC(), BuildIndexInfo(), DEBUG2, elog, IndexVacuumInfo::estimated_count, GetUserIdAndSecContext(), heap_close, heap_open(), v_i_state::htups, IndexInfo::ii_Concurrent, IndexVacuumInfo::index, index_bulk_delete(), index_close(), index_open(), InvalidOid, v_i_state::itups, maintenance_work_mem, IndexVacuumInfo::message_level, NewGUCNestLevel(), NoLock, NULL, IndexVacuumInfo::num_heap_tuples, RelationData::rd_rel, RowExclusiveLock, SECURITY_RESTRICTED_OPERATION, SetUserIdAndSecContext(), ShareUpdateExclusiveLock, IndexVacuumInfo::strategy, TIDLessOperator, TIDOID, v_i_state::tuplesort, tuplesort_begin_datum(), tuplesort_end(), tuplesort_performsort(), v_i_state::tups_inserted, validate_index_callback(), and validate_index_heapscan().
Referenced by DefineIndex().
{
Relation heapRelation,
indexRelation;
IndexInfo *indexInfo;
IndexVacuumInfo ivinfo;
v_i_state state;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
/* Open and lock the parent heap relation */
heapRelation = heap_open(heapId, ShareUpdateExclusiveLock);
/* And the target index relation */
indexRelation = index_open(indexId, RowExclusiveLock);
/*
* Fetch info needed for index_insert. (You might think this should be
* passed in from DefineIndex, but its copy is long gone due to having
* been built in a previous transaction.)
*/
indexInfo = BuildIndexInfo(indexRelation);
/* mark build is concurrent just for consistency */
indexInfo->ii_Concurrent = true;
/*
* Switch to the table owner's userid, so that any index functions are run
* as that user. Also lock down security-restricted operations and
* arrange to make GUC variable changes local to this command.
*/
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(heapRelation->rd_rel->relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
/*
* Scan the index and gather up all the TIDs into a tuplesort object.
*/
ivinfo.index = indexRelation;
ivinfo.analyze_only = false;
ivinfo.estimated_count = true;
ivinfo.message_level = DEBUG2;
ivinfo.num_heap_tuples = heapRelation->rd_rel->reltuples;
ivinfo.strategy = NULL;
state.tuplesort = tuplesort_begin_datum(TIDOID, TIDLessOperator,
InvalidOid, false,
maintenance_work_mem,
false);
state.htups = state.itups = state.tups_inserted = 0;
(void) index_bulk_delete(&ivinfo, NULL,
validate_index_callback, (void *) &state);
/* Execute the sort */
tuplesort_performsort(state.tuplesort);
/*
* Now scan the heap and "merge" it with the index
*/
validate_index_heapscan(heapRelation,
indexRelation,
indexInfo,
snapshot,
&state);
/* Done with tuplesort object */
tuplesort_end(state.tuplesort);
elog(DEBUG2,
"validate_index found %.0f heap tuples, %.0f index tuples; inserted %.0f missing tuples",
state.htups, state.itups, state.tups_inserted);
/* Roll back any GUC changes executed by index functions */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);
/* Close rels, but keep locks */
index_close(indexRelation, NoLock);
heap_close(heapRelation, NoLock);
}
1.7.1