suse man page for rollback_prepared

ROLLBACK 
PREPARED(7)						   SQL Commands 					      ROLLBACK PREPARED(7)

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.

EXAMPLES
       Roll back the transaction identified by the transaction identifier foobar:

       ROLLBACK PREPARED 'foobar';

SEE ALSO
       PREPARE TRANSACTION [prepare_transaction(7)], COMMIT PREPARED [commit_prepared(7)]

SQL - Language Statements					    2010-05-14						      ROLLBACK PREPARED(7)