| allow_system_table_mods | off | Allows modifications of the structure of system tables. |
| application_name | | Sets the application name to be reported in statistics and logs. |
| archive_command | (disabled) | Sets the shell command that will be called to archive a WAL file. |
| archive_mode | off | Allows archiving of WAL files using archive_command. |
| archive_timeout | 0 | Forces a switch to the next xlog file if a new file has not been started within N seconds. |
| array_nulls | on | Enable input of NULL elements in arrays. |
| authentication_timeout | 1min | Sets the maximum allowed time to complete client authentication. |
| autovacuum | on | Starts the autovacuum subprocess. |
| autovacuum_analyze_scale_factor | 0.1 | Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples. |
| autovacuum_analyze_threshold | 50 | Minimum number of tuple inserts, updates, or deletes prior to analyze. |
| autovacuum_freeze_max_age | 200000000 | Age at which to autovacuum a table to prevent transaction ID wraparound. |
| autovacuum_max_workers | 3 | Sets the maximum number of simultaneously running autovacuum worker processes. |
| autovacuum_multixact_freeze_max_age | 400000000 | Multixact age at which to autovacuum a table to prevent multixact wraparound. |
| autovacuum_naptime | 1min | Time to sleep between autovacuum runs. |
| autovacuum_vacuum_cost_delay | 20ms | Vacuum cost delay in milliseconds, for autovacuum. |
| autovacuum_vacuum_cost_limit | -1 | Vacuum cost amount available before napping, for autovacuum. |
| autovacuum_vacuum_scale_factor | 0.2 | Number of tuple updates or deletes prior to vacuum as a fraction of reltuples. |
| autovacuum_vacuum_threshold | 50 | Minimum number of tuple updates or deletes prior to vacuum. |
| backslash_quote | safe_encoding | Sets whether "\'" is allowed in string literals. |
| bgwriter_delay | 200ms | Background writer sleep time between rounds. |
| bgwriter_lru_maxpages | 100 | Background writer maximum number of LRU pages to flush per round. |
| bgwriter_lru_multiplier | 2 | Multiple of the average buffer usage to free per round. |
| block_size | 8192 | Shows the size of a disk block. |
| bonjour | off | Enables advertising the server via Bonjour. |
| bonjour_name | | Sets the Bonjour service name. |
| bytea_output | hex | Sets the output format for bytea. |
| check_function_bodies | on | Check function bodies during CREATE FUNCTION. |
| checkpoint_completion_target | 0.5 | Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval. |
| checkpoint_segments | 3 | Sets the maximum distance in log segments between automatic WAL checkpoints. |
| checkpoint_timeout | 5min | Sets the maximum time between automatic WAL checkpoints. |
| checkpoint_warning | 30s | Enables warnings if checkpoint segments are filled more frequently than this. |
| client_encoding | UTF8 | Sets the client's character set encoding. |
| client_min_messages | notice | Sets the message levels that are sent to the client. |
| commit_delay | 0 | Sets the delay in microseconds between transaction commit and flushing WAL to disk. |
| commit_siblings | 5 | Sets the minimum concurrent open transactions before performing commit_delay. |
| config_file | C:/Program Files/PostgreSQL/9.3/data/postgresql.conf | Sets the server's main configuration file. |
| constraint_exclusion | partition | Enables the planner to use constraints to optimize queries. |
| cpu_index_tuple_cost | 0.005 | Sets the planner's estimate of the cost of processing each index entry during an index scan. |
| cpu_operator_cost | 0.0025 | Sets the planner's estimate of the cost of processing each operator or function call. |
| cpu_tuple_cost | 0.01 | Sets the planner's estimate of the cost of processing each tuple (row). |
| cursor_tuple_fraction | 0.1 | Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved. |
| data_checksums | off | Shows whether data checksums are turned on for this cluster. |
| data_directory | C:/Program Files/PostgreSQL/9.3/data | Sets the server's data directory. |
| DateStyle | ISO, MDY | Sets the display format for date and time values. |
| db_user_namespace | off | Enables per-database user names. |
| deadlock_timeout | 1s | Sets the time to wait on a lock before checking for deadlock. |
| debug_assertions | off | Turns on various assertion checks. |
| debug_pretty_print | on | Indents parse and plan tree displays. |
| debug_print_parse | off | Logs each query's parse tree. |
| debug_print_plan | off | Logs each query's execution plan. |
| debug_print_rewritten | off | Logs each query's rewritten parse tree. |
| default_statistics_target | 100 | Sets the default statistics target. |
| default_tablespace | | Sets the default tablespace to create tables and indexes in. |
| default_text_search_config | pg_catalog.english | Sets default text search configuration. |
| default_transaction_deferrable | off | Sets the default deferrable status of new transactions. |
| default_transaction_isolation | read committed | Sets the transaction isolation level of each new transaction. |
| default_transaction_read_only | off | Sets the default read-only status of new transactions. |
| default_with_oids | off | Create new tables with OIDs by default. |
| dynamic_library_path | $libdir | Sets the path for dynamically loadable modules. |
| effective_cache_size | 128MB | Sets the planner's assumption about the size of the disk cache. |
| effective_io_concurrency | 0 | Number of simultaneous requests that can be handled efficiently by the disk subsystem. |
| enable_bitmapscan | on | Enables the planner's use of bitmap-scan plans. |
| enable_hashagg | on | Enables the planner's use of hashed aggregation plans. |
| enable_hashjoin | on | Enables the planner's use of hash join plans. |
| enable_indexonlyscan | on | Enables the planner's use of index-only-scan plans. |
| enable_indexscan | on | Enables the planner's use of index-scan plans. |
| enable_material | on | Enables the planner's use of materialization. |
| enable_mergejoin | on | Enables the planner's use of merge join plans. |
| enable_nestloop | on | Enables the planner's use of nested-loop join plans. |
| enable_seqscan | on | Enables the planner's use of sequential-scan plans. |
| enable_sort | on | Enables the planner's use of explicit sort steps. |
| enable_tidscan | on | Enables the planner's use of TID scan plans. |
| escape_string_warning | on | Warn about backslash escapes in ordinary string literals. |
| event_source | PostgreSQL | Sets the application name used to identify PostgreSQL messages in the event log. |
| exit_on_error | off | Terminate session on any error. |
| external_pid_file | | Writes the postmaster PID to the specified file. |
| extra_float_digits | 3 | Sets the number of digits displayed for floating-point values. |
| from_collapse_limit | 8 | Sets the FROM-list size beyond which subqueries are not collapsed. |
| fsync | on | Forces synchronization of updates to disk. |
| full_page_writes | on | Writes full pages to WAL when first modified after a checkpoint. |
| geqo | on | Enables genetic query optimization. |
| geqo_effort | 5 | GEQO: effort is used to set the default for other GEQO parameters. |
| geqo_generations | 0 | GEQO: number of iterations of the algorithm. |
| geqo_pool_size | 0 | GEQO: number of individuals in the population. |
| geqo_seed | 0 | GEQO: seed for random path selection. |
| geqo_selection_bias | 2 | GEQO: selective pressure within the population. |
| geqo_threshold | 12 | Sets the threshold of FROM items beyond which GEQO is used. |
| gin_fuzzy_search_limit | 0 | Sets the maximum allowed result for exact search by GIN. |
| hba_file | C:/Program Files/PostgreSQL/9.3/data/pg_hba.conf | Sets the server's "hba" configuration file. |
| hot_standby | off | Allows connections and queries during recovery. |
| hot_standby_feedback | off | Allows feedback from a hot standby to the primary that will avoid query conflicts. |
| ident_file | C:/Program Files/PostgreSQL/9.3/data/pg_ident.conf | Sets the server's "ident" configuration file. |
| ignore_checksum_failure | off | Continues processing after a checksum failure. |
| ignore_system_indexes | off | Disables reading from system indexes. |
| integer_datetimes | on | Datetimes are integer based. |
| IntervalStyle | postgres | Sets the display format for interval values. |
| join_collapse_limit | 8 | Sets the FROM-list size beyond which JOIN constructs are not flattened. |
| krb_caseins_users | off | Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive. |
| krb_server_keyfile | | Sets the location of the Kerberos server key file. |
| krb_srvname | postgres | Sets the name of the Kerberos service. |
| lc_collate | English_United States.1252 | Shows the collation order locale. |
| lc_ctype | English_United States.1252 | Shows the character classification and case conversion locale. |
| lc_messages | English_United States.1252 | Sets the language in which messages are displayed. |
| lc_monetary | C | Sets the locale for formatting monetary amounts. |
| lc_numeric | English_United States.1252 | Sets the locale for formatting numbers. |
| lc_time | English_United States.1252 | Sets the locale for formatting date and time values. |
| listen_addresses | * | Sets the host name or IP address(es) to listen to. |
| lo_compat_privileges | off | Enables backward compatibility mode for privilege checks on large objects. |
| local_preload_libraries | | Lists shared libraries to preload into each backend. |
| lock_timeout | 0 | Sets the maximum allowed duration of any wait for a lock. |
| log_autovacuum_min_duration | -1 | Sets the minimum execution time above which autovacuum actions will be logged. |
| log_checkpoints | off | Logs each checkpoint. |
| log_connections | off | Logs each successful connection. |
| log_destination | stderr | Sets the destination for server log output. |
| log_directory | pg_log | Sets the destination directory for log files. |
| log_disconnections | off | Logs end of a session, including duration. |
| log_duration | off | Logs the duration of each completed SQL statement. |
| log_error_verbosity | default | Sets the verbosity of logged messages. |
| log_executor_stats | off | Writes executor performance statistics to the server log. |
| log_file_mode | 0600 | Sets the file permissions for log files. |
| log_filename | postgresql-%Y-%m-%d_%H%M%S.log | Sets the file name pattern for log files. |
| log_hostname | off | Logs the host name in the connection logs. |
| log_line_prefix | %t | Controls information prefixed to each log line. |
| log_lock_waits | off | Logs long lock waits. |
| log_min_duration_statement | -1 | Sets the minimum execution time above which statements will be logged. |
| log_min_error_statement | error | Causes all statements generating error at or above this level to be logged. |
| log_min_messages | warning | Sets the message levels that are logged. |
| log_parser_stats | off | Writes parser performance statistics to the server log. |
| log_planner_stats | off | Writes planner performance statistics to the server log. |
| log_rotation_age | 1d | Automatic log file rotation will occur after N minutes. |
| log_rotation_size | 10MB | Automatic log file rotation will occur after N kilobytes. |
| log_statement | none | Sets the type of statements logged. |
| log_statement_stats | off | Writes cumulative performance statistics to the server log. |
| log_temp_files | -1 | Log the use of temporary files larger than this number of kilobytes. |
| log_timezone | Asia/Katmandu | Sets the time zone to use in log messages. |
| log_truncate_on_rotation | off | Truncate existing log files of same name during log rotation. |
| logging_collector | on | Start a subprocess to capture stderr output and/or csvlogs into log files. |
| maintenance_work_mem | 16MB | Sets the maximum memory to be used for maintenance operations. |
| max_connections | 100 | Sets the maximum number of concurrent connections. |
| max_files_per_process | 1000 | Sets the maximum number of simultaneously open files for each server process. |
| max_function_args | 100 | Shows the maximum number of function arguments. |
| max_identifier_length | 63 | Shows the maximum identifier length. |
| max_index_keys | 32 | Shows the maximum number of index keys. |
| max_locks_per_transaction | 64 | Sets the maximum number of locks per transaction. |
| max_pred_locks_per_transaction | 64 | Sets the maximum number of predicate locks per transaction. |
| max_prepared_transactions | 0 | Sets the maximum number of simultaneously prepared transactions. |
| max_stack_depth | 2MB | Sets the maximum stack depth, in kilobytes. |
| max_standby_archive_delay | 30s | Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data. |
| max_standby_streaming_delay | 30s | Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data. |
| max_wal_senders | 0 | Sets the maximum number of simultaneously running WAL sender processes. |
| password_encryption | on | Encrypt passwords. |
| plpgsql.variable_conflict | error | Sets handling of conflicts between PL/pgSQL variable names and table column names. |
| port | 5432 | Sets the TCP port the server listens on. |
| post_auth_delay | 0 | Waits N seconds on connection startup after authentication. |
| pre_auth_delay | 0 | Waits N seconds on connection startup before authentication. |
| quote_all_identifiers | off | When generating SQL fragments, quote all identifiers. |
| random_page_cost | 4 | Sets the planner's estimate of the cost of a nonsequentially fetched disk page. |
| restart_after_crash | on | Reinitialize server after backend crash. |
| search_path | "$user",public | Sets the schema search order for names that are not schema-qualified. |
| segment_size | 1GB | Shows the number of pages per disk file. |
| seq_page_cost | 1 | Sets the planner's estimate of the cost of a sequentially fetched disk page. |
| server_encoding | UTF8 | Sets the server (database) character set encoding. |
| server_version | 9.3.4 | Shows the server version. |
| server_version_num | 90304 | Shows the server version as an integer. |
| session_replication_role | origin | Sets the session's behavior for triggers and rewrite rules. |
| shared_buffers | 128MB | Sets the number of shared memory buffers used by the server. |
| shared_preload_libraries | | Lists shared libraries to preload into server. |
| sql_inheritance | on | Causes subtables to be included by default in various commands. |
| ssl | off | Enables SSL connections. |
| ssl_ca_file | | Location of the SSL certificate authority file. |
| ssl_cert_file | server.crt | Location of the SSL server certificate file. |
| ssl_ciphers | DEFAULT:!LOW:!EXP:!MD5:@STRENGTH | Sets the list of allowed SSL ciphers. |
| ssl_crl_file | | Location of the SSL certificate revocation list file. |
| ssl_key_file | server.key | Location of the SSL server private key file. |
| ssl_renegotiation_limit | 0 | Set the amount of traffic to send and receive before renegotiating the encryption keys. |
| standard_conforming_strings | on | Causes '...' strings to treat backslashes literally. |
| statement_timeout | 0 | Sets the maximum allowed duration of any statement. |
| stats_temp_directory | pg_stat_tmp | Writes temporary statistics files to the specified directory. |
| superuser_reserved_connections | 3 | Sets the number of connection slots reserved for superusers. |
| synchronize_seqscans | on | Enable synchronized sequential scans. |
| synchronous_commit | on | Sets the current transaction's synchronization level. |
| synchronous_standby_names | | List of names of potential synchronous standbys. |
| syslog_facility | none | Sets the syslog "facility" to be used when syslog enabled. |
| syslog_ident | postgres | Sets the program name used to identify PostgreSQL messages in syslog. |
| tcp_keepalives_count | 0 | Maximum number of TCP keepalive retransmits. |
| tcp_keepalives_idle | -1 | Time between issuing TCP keepalives. |
| tcp_keepalives_interval | -1 | Time between TCP keepalive retransmits. |
| temp_buffers | 8MB | Sets the maximum number of temporary buffers used by each session. |
| temp_file_limit | -1 | Limits the total size of all temporary files used by each session. |
| temp_tablespaces | | Sets the tablespace(s) to use for temporary tables and sort files. |
| TimeZone | UTC | Sets the time zone for displaying and interpreting time stamps. |
| timezone_abbreviations | Default | Selects a file of time zone abbreviations. |
| trace_notify | off | Generates debugging output for LISTEN and NOTIFY. |
| trace_recovery_messages | log | Enables logging of recovery-related debugging information. |
| trace_sort | off | Emit information about resource usage in sorting. |
| track_activities | on | Collects information about executing commands. |
| track_activity_query_size | 1024 | Sets the size reserved for pg_stat_activity.query, in bytes. |
| track_counts | on | Collects statistics on database activity. |
| track_functions | none | Collects function-level statistics on database activity. |
| track_io_timing | off | Collects timing statistics for database I/O activity. |
| transaction_deferrable | off | Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures. |
| transaction_isolation | read committed | Sets the current transaction's isolation level. |
| transaction_read_only | off | Sets the current transaction's read-only status. |
| transform_null_equals | off | Treats "expr=NULL" as "expr IS NULL". |
| unix_socket_directories | | Sets the directories where Unix-domain sockets will be created. |
| unix_socket_group | | Sets the owning group of the Unix-domain socket. |
| unix_socket_permissions | 0777 | Sets the access permissions of the Unix-domain socket. |
| update_process_title | on | Updates the process title to show the active SQL command. |
| vacuum_cost_delay | 0 | Vacuum cost delay in milliseconds. |
| vacuum_cost_limit | 200 | Vacuum cost amount available before napping. |
| vacuum_cost_page_dirty | 20 | Vacuum cost for a page dirtied by vacuum. |
| vacuum_cost_page_hit | 1 | Vacuum cost for a page found in the buffer cache. |
| vacuum_cost_page_miss | 10 | Vacuum cost for a page not found in the buffer cache. |
| vacuum_defer_cleanup_age | 0 | Number of transactions by which VACUUM and HOT cleanup should be deferred, if any. |
| vacuum_freeze_min_age | 50000000 | Minimum age at which VACUUM should freeze a table row. |
| vacuum_freeze_table_age | 150000000 | Age at which VACUUM should scan whole table to freeze tuples. |
| vacuum_multixact_freeze_min_age | 5000000 | Minimum age at which VACUUM should freeze a MultiXactId in a table row. |
| vacuum_multixact_freeze_table_age | 150000000 | Multixact age at which VACUUM should scan whole table to freeze tuples. |
| wal_block_size | 8192 | Shows the block size in the write ahead log. |
| wal_buffers | 4MB | Sets the number of disk-page buffers in shared memory for WAL. |
| wal_keep_segments | 0 | Sets the number of WAL files held for standby servers. |
| wal_level | minimal | Set the level of information written to the WAL. |
| wal_receiver_status_interval | 10s | Sets the maximum interval between WAL receiver status reports to the primary. |
| wal_receiver_timeout | 1min | Sets the maximum wait time to receive data from the primary. |
| wal_segment_size | 16MB | Shows the number of pages per write ahead log segment. |
| wal_sender_timeout | 1min | Sets the maximum time to wait for WAL replication. |
| wal_sync_method | open_datasync | Selects the method used for forcing WAL updates to disk. |
| wal_writer_delay | 200ms | WAL writer sleep time between WAL flushes. |
| work_mem | 1MB | Sets the maximum memory to be used for query workspaces. |
| xmlbinary | base64 | Sets how binary values are to be encoded in XML. |
| xmloption | content | Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments. |
| zero_damaged_pages | off | Continues processing past damaged page headers. |