NAME

       ROLLBACK_PREPARED - cancel a transaction that was earlier prepared for two-phase commit

SYNOPSIS

       ROLLBACK PREPARED transaction_id

DESCRIPTION

       ROLLBACK PREPARED rolls back a transaction that is in prepared state.

PARAMETERS

       transaction_id
           The transaction identifier of the transaction that is to be rolled back.

NOTES

       To roll back a prepared transaction, you must be either the same user that executed the transaction
       originally, or a superuser. But you do not have to be in the same session that executed the transaction.

       This command cannot be executed inside a transaction block. The prepared transaction is rolled back
       immediately.

       All currently available prepared transactions are listed in the pg_prepared_xacts system view.

           Note

           The following description applies only to Postgres-XC

       If more than one Datanode and/or Coordinator are involved in the transaction, ROLLBACK PREPARED command
       will propagate to all these nodes.

           Note

           The following description applies only to Postgres-XC

       If xc_maintenance_mode GUC parameter is set to ON, ROLLBACK PREPARED will not propagate to other nodes.
       It just runs locally and report the result to GTM.

EXAMPLES

       Roll back the transaction identified by the transaction identifier foobar:

           ROLLBACK PREPARED 'foobar';

COMPATIBILITY

       ROLLBACK PREPARED is a PostgreSQL extension. It is intended for use by external transaction management
       systems, some of which are covered by standards (such as X/Open XA), but the SQL side of those systems is
       not standardized.

SEE ALSO

       PREPARE TRANSACTION (PREPARE_TRANSACTION(7)), COMMIT PREPARED (COMMIT_PREPARED(7)), xc_maintenance_mode

Postgres-XC 1.1                                    2014-04-07                               ROLLBACK PREPARED(7)