PostgreSQL
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.) TEMPORARYorTEMP-
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;