DISCARD
DISCARD — discard session state
Synopsis
DISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP }
Description
DISCARD releases internal resources associated with a database session. This command is useful for partially or fully resetting the session's state. There are several subcommands to release different types of resources; the DISCARD ALL variant subsumes all the others, and also resets additional state.
Parameters
PLANSReleases all cached query plans, forcing re-planning to occur the next time the associated prepared statement is used.
SEQUENCESDiscards all cached sequence-related state, including
currval()/lastval()information and any preallocated sequence values that have not yet been returned bynextval(). (See CREATE SEQUENCE for a description of preallocated sequence values.)TEMPORARYorTEMPDrops all temporary tables created in the current session.
ALLReleases all temporary resources associated with the current session and resets the session to its initial state. Currently, this has the same effect as executing the following sequence of statements:
SET SESSION AUTHORIZATION DEFAULT; RESET ALL; DEALLOCATE ALL; CLOSE ALL; UNLISTEN *; SELECT pg_advisory_unlock_all(); DISCARD PLANS; DISCARD SEQUENCES; DISCARD TEMP;
Notes
DISCARD ALL cannot be executed inside a transaction block.
Compatibility
DISCARD is a PostgreSQL extension.