## ROLLBACK PREPARED

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.

## See Also

PREPARE TRANSACTION, COMMIT PREPARED