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Database Commands

Database Commands¶

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User Commands
Database Operations
Internal Commands
Testing Commands
Auditing Commands

All command documentation outlined below describes a command and its available parameters and provides a document template or prototype for each command. Some command documentation also includes the relevant mongo shell helpers.

User Commands¶

Aggregation Commands¶

Name	Description
`aggregate`	Performs aggregation tasks such as group using the aggregation framework.
`count`	Counts the number of documents in a collection.
`distinct`	Displays the distinct values found for a specified key in a collection.
`group`	Groups documents in a collection by the specified key and performs simple aggregation.
`mapReduce`	Performs map-reduce aggregation for large data sets.

Geospatial Commands¶

Name	Description
`geoNear`	Performs a geospatial query that returns the documents closest to a given point.
`geoSearch`	Performs a geospatial query that uses MongoDB’s haystack index functionality.

Query and Write Operation Commands¶

Name	Description
`find`	Selects documents in a collection.
`insert`	Inserts one or more documents.
`update`	Updates one or more documents.
`delete`	Deletes one or more documents.
`findAndModify`	Returns and modifies a single document.
`getMore`	Returns batches of documents currently pointed to by the cursor.
`getLastError`	Returns the success status of the last operation.
`getPrevError`	Returns status document containing all errors since the last `resetError` command.
`resetError`	Resets the last error status.
`eval`	Deprecated. Runs a JavaScript function on the database server.
`parallelCollectionScan`	Lets applications use multiple parallel cursors when reading documents from a collection.

Query Plan Cache Commands¶

Name	Description
`planCacheListFilters`	Lists the index filters for a collection.
`planCacheSetFilter`	Sets an index filter for a collection.
`planCacheClearFilters`	Clears index filter(s) for a collection.
`planCacheListQueryShapes`	Displays the query shapes for which cached query plans exist.
`planCacheListPlans`	Displays the cached query plans for the specified query shape.
`planCacheClear`	Removes cached query plan(s) for a collection.

Database Operations¶

Authentication Commands¶

Name	Description
`logout`	Terminates the current authenticated session.
`authenticate`	Starts an authenticated session using a username and password.
`copydbgetnonce`	This is an internal command to generate a one-time password for use with the `copydb` command.
`getnonce`	This is an internal command to generate a one-time password for authentication.
`authSchemaUpgrade`	Supports the upgrade process for user data between version 2.4 and 2.6.

User Management Commands¶

Name	Description
`createUser`	Creates a new user.
`updateUser`	Updates a user’s data.
`dropUser`	Removes a single user.
`dropAllUsersFromDatabase`	Deletes all users associated with a database.
`grantRolesToUser`	Grants a role and its privileges to a user.
`revokeRolesFromUser`	Removes a role from a user.
`usersInfo`	Returns information about the specified users.

Role Management Commands¶

Name	Description
`createRole`	Creates a role and specifies its privileges.
`updateRole`	Updates a user-defined role.
`dropRole`	Deletes the user-defined role.
`dropAllRolesFromDatabase`	Deletes all user-defined roles from a database.
`grantPrivilegesToRole`	Assigns privileges to a user-defined role.
`revokePrivilegesFromRole`	Removes the specified privileges from a user-defined role.
`grantRolesToRole`	Specifies roles from which a user-defined role inherits privileges.
`revokeRolesFromRole`	Removes specified inherited roles from a user-defined role.
`rolesInfo`	Returns information for the specified role or roles.
`invalidateUserCache`	Flushes the in-memory cache of user information, including credentials and roles.

Replication Commands¶

Name	Description
`replSetFreeze`	Prevents the current member from seeking election as primary for a period of time.
`replSetGetStatus`	Returns a document that reports on the status of the replica set.
`replSetInitiate`	Initializes a new replica set.
`replSetMaintenance`	Enables or disables a maintenance mode, which puts a secondary node in a `RECOVERING` state.
`replSetReconfig`	Applies a new configuration to an existing replica set.
`replSetStepDown`	Forces the current primary to step down and become a secondary, forcing an election.
`replSetSyncFrom`	Explicitly override the default logic for selecting a member to replicate from.
`resync`	Forces a `mongod` to re-synchronize from the master. For master-slave replication only.
`applyOps`	Internal command that applies oplog entries to the current data set.
`isMaster`	Displays information about this member’s role in the replica set, including whether it is the master.
`replSetGetConfig`	Returns the replica set’s configuration object.

Sharding Commands¶

Name	Description
`flushRouterConfig`	Forces an update to the cluster metadata cached by a `mongos`.
`addShard`	Adds a shard to a sharded cluster.
`cleanupOrphaned`	Removes orphaned data with shard key values outside of the ranges of the chunks owned by a shard.
`checkShardingIndex`	Internal command that validates index on shard key.
`enableSharding`	Enables sharding on a specific database.
`listShards`	Returns a list of configured shards.
`removeShard`	Starts the process of removing a shard from a sharded cluster.
`getShardMap`	Internal command that reports on the state of a sharded cluster.
`getShardVersion`	Internal command that returns the config server version.
`mergeChunks`	Provides the ability to combine chunks on a single shard.
`setShardVersion`	Internal command to sets the config server version.
`shardCollection`	Enables the sharding functionality for a collection, allowing the collection to be sharded.
`shardingState`	Reports whether the `mongod` is a member of a sharded cluster.
`unsetSharding`	Internal command that affects connections between instances in a MongoDB deployment.
`split`	Creates a new chunk.
`splitChunk`	Internal command to split chunk. Instead use the methods `sh.splitFind()` and `sh.splitAt()`.
`splitVector`	Internal command that determines split points.
`medianKey`	Deprecated internal command. See `splitVector`.
`moveChunk`	Internal command that migrates chunks between shards.
`movePrimary`	Reassigns the primary shard when removing a shard from a sharded cluster.
`isdbgrid`	Verifies that a process is a `mongos`.

Instance Administration Commands¶

Name	Description
`renameCollection`	Changes the name of an existing collection.
`copydb`	Copies a database from a remote host to the current host.
`dropDatabase`	Removes the current database.
`listCollections`	Returns a list of collections in the current database.
`drop`	Removes the specified collection from the database.
`create`	Creates a collection and sets collection parameters.
`clone`	Copies a database from a remote host to the current host.
`cloneCollection`	Copies a collection from a remote host to the current host.
`cloneCollectionAsCapped`	Copies a non-capped collection as a new capped collection.
`convertToCapped`	Converts a non-capped collection to a capped collection.
`filemd5`	Returns the md5 hash for files stored using GridFS.
`createIndexes`	Builds one or more indexes for a collection.
`listIndexes`	Lists all indexes for a collection.
`dropIndexes`	Removes indexes from a collection.
`fsync`	Flushes pending writes to the storage layer and locks the database to allow backups.
`clean`	Internal namespace administration command.
`connPoolSync`	Internal command to flush connection pool.
`connectionStatus`	Reports the authentication state for the current connection.
`compact`	Defragments a collection and rebuilds the indexes.
`collMod`	Add flags to collection to modify the behavior of MongoDB.
`reIndex`	Rebuilds all indexes on a collection.
`setParameter`	Modifies configuration options.
`getParameter`	Retrieves configuration options.
`repairDatabase`	Repairs any errors and inconsistencies with the data storage.
`repairCursor`	Returns a cursor that iterates over all valid documents in a collection.
`touch`	Loads documents and indexes from data storage to memory.
`shutdown`	Shuts down the `mongod` or `mongos` process.
`logRotate`	Rotates the MongoDB logs to prevent a single file from taking too much space.

Diagnostic Commands¶

Name	Description
`explain`	Returns information on the execution of various operations.
`listDatabases`	Returns a document that lists all databases and returns basic database statistics.
`dbHash`	Internal command to support sharding.
`driverOIDTest`	Internal command that converts an ObjectId to a string to support tests.
`listCommands`	Lists all database commands provided by the current `mongod` instance.
`availableQueryOptions`	Internal command that reports on the capabilities of the current MongoDB instance.
`buildInfo`	Displays statistics about the MongoDB build.
`collStats`	Reports storage utilization statics for a specified collection.
`connPoolStats`	Reports statistics on the outgoing connections from this MongoDB instance to other MongoDB instances in the deployment.
`shardConnPoolStats`	Reports statistics on a `mongos`‘s connection pool for client operations against shards.
`dbStats`	Reports storage utilization statistics for the specified database.
`cursorInfo`	Removed in MongoDB 3.2. Replaced with `metrics.cursor`.
`dataSize`	Returns the data size for a range of data. For internal use.
`diagLogging`	Provides a diagnostic logging. For internal use.
`getCmdLineOpts`	Returns a document with the run-time arguments to the MongoDB instance and their parsed options.
`netstat`	Internal command that reports on intra-deployment connectivity. Only available for `mongos` instances.
`ping`	Internal command that tests intra-deployment connectivity.
`profile`	Interface for the database profiler.
`validate`	Internal command that scans for a collection’s data and indexes for correctness.
`top`	Returns raw usage statistics for each database in the `mongod` instance.
`whatsmyuri`	Internal command that returns information on the current client.
`getLog`	Returns recent log messages.
`hostInfo`	Returns data that reflects the underlying host system.
`serverStatus`	Returns a collection metrics on instance-wide resource utilization and status.
`features`	Reports on features available in the current MongoDB instance.
`isSelf`	Internal command to support testing.

Internal Commands¶

Name	Description
`handshake`	Internal command.
`_recvChunkAbort`	Internal command that supports chunk migrations in sharded clusters. Do not call directly.
`_recvChunkCommit`	Internal command that supports chunk migrations in sharded clusters. Do not call directly.
`_recvChunkStart`	Internal command that facilitates chunk migrations in sharded clusters.. Do not call directly.
`_recvChunkStatus`	Internal command that returns data to support chunk migrations in sharded clusters. Do not call directly.
`_replSetFresh`	Internal command that supports replica set election operations.
`mapreduce.shardedfinish`	Internal command that supports map-reduce in sharded cluster environments.
`_transferMods`	Internal command that supports chunk migrations. Do not call directly.
`replSetHeartbeat`	Internal command that supports replica set operations.
`replSetGetRBID`	Internal command that supports replica set operations.
`_migrateClone`	Internal command that supports chunk migration. Do not call directly.
`replSetElect`	Internal command that supports replica set functionality.
`writeBacksQueued`	Internal command that supports chunk migrations in sharded clusters.
`writebacklisten`	Internal command that supports chunk migrations in sharded clusters.

Testing Commands¶

Name	Description
`testDistLockWithSkew`	Internal command. Do not call this directly.
`testDistLockWithSyncCluster`	Internal command. Do not call this directly.
`captrunc`	Internal command. Truncates capped collections.
`emptycapped`	Internal command. Removes all documents from a capped collection.
`godinsert`	Internal command for testing.
`_hashBSONElement`	Internal command. Computes the MD5 hash of a BSON element.
`journalLatencyTest`	Tests the time required to write and perform a file system sync for a file in the journal directory.
`sleep`	Internal command for testing. Forces MongoDB to block all operations.
`replSetTest`	Internal command for testing replica set functionality.
`forceerror`	Internal command for testing. Forces a user assertion exception.
`skewClockCommand`	Internal command. Do not call this command directly.
`configureFailPoint`	Internal command for testing. Configures failure points.

Auditing Commands¶

Name	Description
`logApplicationMessage`	Posts a custom message to the audit log.

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