discard(7) [centos man page]

DISCARD(7)						  PostgreSQL 9.2.7 Documentation						DISCARD(7)

NAME

       DISCARD - discard session state

SYNOPSIS

       DISCARD { ALL | PLANS | TEMPORARY | TEMP }

DESCRIPTION

       DISCARD releases internal resources associated with a database session. These resources are normally released at the end of the session.

       DISCARD TEMP drops all temporary tables created in the current session.	DISCARD PLANS releases all internally cached query plans.  DISCARD
       ALL resets a session to its original state, discarding temporary resources and resetting session-local configuration changes.

PARAMETERS

       TEMPORARY or TEMP
	   Drops all temporary tables created in the current session.

       PLANS
	   Releases all cached query plans.

       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 TEMP;

NOTES

       DISCARD ALL cannot be executed inside a transaction block.

COMPATIBILITY

       DISCARD is a PostgreSQL extension.

PostgreSQL 9.2.7						    2014-02-17								DISCARD(7)

UNLISTEN(7)						  PostgreSQL 9.2.7 Documentation					       UNLISTEN(7)

NAME

       UNLISTEN - stop listening for a notification

SYNOPSIS

       UNLISTEN { channel | * }

DESCRIPTION

       UNLISTEN is used to remove an existing registration for NOTIFY events.  UNLISTEN cancels any existing registration of the current
       PostgreSQL session as a listener on the notification channel named channel. The special wildcard * cancels all listener registrations for
       the current session.

       NOTIFY(7) contains a more extensive discussion of the use of LISTEN and NOTIFY.

PARAMETERS

       channel
	   Name of a notification channel (any identifier).

       *
	   All current listen registrations for this session are cleared.

NOTES

       You can unlisten something you were not listening for; no warning or error will appear.

       At the end of each session, UNLISTEN * is automatically executed.

       A transaction that has executed UNLISTEN cannot be prepared for two-phase commit.

EXAMPLES

       To make a registration:

	   LISTEN virtual;
	   NOTIFY virtual;
	   Asynchronous notification "virtual" received from server process with PID 8448.

       Once UNLISTEN has been executed, further NOTIFY messages will be ignored:

	   UNLISTEN virtual;
	   NOTIFY virtual;
	   -- no NOTIFY event is received

COMPATIBILITY

       There is no UNLISTEN command in the SQL standard.

SEE ALSO

       LISTEN(7), NOTIFY(7)

PostgreSQL 9.2.7						    2014-02-17							       UNLISTEN(7)