ROLLBACK PREPARED

PostgreSQL 9.2.19 Documentation
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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';

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.