|PostgreSQL 8.2.6 Documentation|
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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.
Roll back the transaction identified by the transaction identifier foobar:
ROLLBACK PREPARED 'foobar';