| DISCARD(7) - phpMan
DISCARD(7) PostgreSQL 12.3 Documentation DISCARD(7)
NAME
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
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 by nextval().
(See CREATE SEQUENCE (CREATE_SEQUENCE(7)) 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:
CLOSE ALL;
SET SESSION AUTHORIZATION DEFAULT;
RESET ALL;
DEALLOCATE ALL;
UNLISTEN *;
SELECT pg_advisory_unlock_all();
DISCARD PLANS;
DISCARD TEMP;
DISCARD SEQUENCES;
NOTES
DISCARD ALL cannot be executed inside a transaction block.
COMPATIBILITY
DISCARD is a PostgreSQL extension.
PostgreSQL 12.3 2020 DISCARD(7)
|