The view pg_tables provides access to useful information about each table in the database. Table 50-79. pg_tables Columns Name Type References Description schemaname name pg_namespace.nspname Name of schema containing table tablename name pg_class.relname Name of table tableowner name pg_authid.rolname Name of table's owner tablespace name pg_tablespace.spcname Name of tablespace containing table (null if default for database) hasindexes boolean pg_class.relhasindex True if table has (or rece

Namepg_test_fsync -- determine fastest wal_sync_method for PostgreSQL Synopsis pg_test_fsync [option...] Description pg_test_fsync is intended to give you a reasonable idea of what the fastest wal_sync_method is on your specific system, as well as supplying diagnostic information in the event of an identified I/O problem. However, differences shown by pg_test_fsync might not make any significant difference in real database throughput, especially since many database servers are not speed

Namepostmaster -- PostgreSQL database server Synopsis postmaster [option...] Description postmaster is a deprecated alias of postgres. See Also postgres Prev Next postgres Up Internals

While the server is running, it is not possible for a malicious user to take the place of the normal database server. However, when the server is down, it is possible for a local user to spoof the normal server by starting their own server. The spoof server could read passwords and queries sent by clients, but could not return any data because the PGDATA directory would still be secure because of directory permissions. Spoofing is possible because any user can start a database server; a client

NameDROP OPERATOR -- remove an operator Synopsis DROP OPERATOR [ IF EXISTS ] name ( { left_type | NONE } , { right_type | NONE } ) [ CASCADE | RESTRICT ] Description DROP OPERATOR drops an existing operator from the database system. To execute this command you must be the owner of the operator. Parameters IF EXISTS Do not throw an error if the operator does not exist. A notice is issued in this case. name The name (optionally schema-qualified) of an existing operator. left_typ

The view pg_rules provides access to useful information about query rewrite rules. Table 50-74. pg_rules Columns Name Type References Description schemaname name pg_namespace.nspname Name of schema containing table tablename name pg_class.relname Name of table the rule is for rulename name pg_rewrite.rulename Name of rule definition text Rule definition (a reconstructed creation command) The pg_rules view excludes the ON SELECT rules of views and materialized views; those can be seen in pg

Namepg_receivexlog -- stream transaction logs from a PostgreSQL server Synopsis pg_receivexlog [option...] Description pg_receivexlog is used to stream the transaction log from a running PostgreSQL cluster. The transaction log is streamed using the streaming replication protocol, and is written to a local directory of files. This directory can be used as the archive location for doing a restore using point-in-time recovery (see Section 25.3). pg_receivexlog streams the transaction log i

NameALTER AGGREGATE -- change the definition of an aggregate function Synopsis ALTER AGGREGATE name ( aggregate_signature ) RENAME TO new_name ALTER AGGREGATE name ( aggregate_signature ) OWNER TO { new_owner | CURRENT_USER | SESSION_USER } ALTER AGGREGATE name ( aggregate_signature ) SET SCHEMA new_schema where aggregate_signature is: * | [ argmode ] [ argname ] argtype [ , ... ] | [ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [

restore_command (string) The local shell command to execute to retrieve an archived segment of the WAL file series. This parameter is required for archive recovery, but optional for streaming replication. Any %f in the string is replaced by the name of the file to retrieve from the archive, and any %p is replaced by the copy destination path name on the server. (The path name is relative to the current working directory, i.e., the cluster's data directory.) Any %r is replaced by the name of

The catalog pg_rewrite stores rewrite rules for tables and views. Table 50-41. pg_rewrite Columns Name Type References Description oid oid Row identifier (hidden attribute; must be explicitly selected) rulename name Rule name ev_class oid pg_class.oid The table this rule is for ev_type char Event type that the rule is for: 1 = SELECT, 2 = UPDATE, 3 = INSERT, 4 = DELETE ev_enabled char Controls in which session_replication_role modes the rule fires. O = rule fires in "origin" and "lo