DISCARD — discard session state
DISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP }
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.
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 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;
DISCARD ALL
cannot be executed inside a transaction block.
DISCARD
is a LightDB extension.