DISCARD(7) PostgreSQL 9.5.0 Documentation DISCARD(7)NAMEDISCARD - discard session state
SYNOPSISDISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP }
DESCRIPTIONDISCARD 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:
SET SESSION AUTHORIZATION DEFAULT;
RESET ALL;
DEALLOCATE ALL;
CLOSE ALL;
UNLISTEN *;
SELECT pg_advisory_unlock_all();
DISCARD PLANS;
DISCARD SEQUENCES;
DISCARD TEMP;
NOTESDISCARD ALL cannot be executed inside a transaction block.
COMPATIBILITYDISCARD is a PostgreSQL extension.
PostgreSQL 9.5.0 2016 DISCARD(7)
