DISCARD
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
- PLANS
-
Releases all cached query plans, forcing re-planning to occur the next time the associated prepared statement is used.
- SEQUENCES
-
Discards 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.) - TEMPORARY or TEMP
-
Drops all temporary tables created in the current session.
- ALL
-
Releases 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;