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DISCARD(7)              PostgreSQL 9.5.0 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:

               SET SESSION AUTHORIZATION DEFAULT;
               RESET ALL;
               DEALLOCATE ALL;
               CLOSE ALL;
               UNLISTEN *;
               SELECT pg_advisory_unlock_all();
               DISCARD PLANS;
               DISCARD SEQUENCES;
               DISCARD TEMP;

NOTES
       DISCARD ALL cannot be executed inside a transaction block.

COMPATIBILITY
       DISCARD is a PostgreSQL extension.

PostgreSQL 9.5.0                     2016                           DISCARD(7)