07-21-2011
you are confused. "df -h" just shows you the file systems.
If you want to back up the file systems, then you should back them up with something such as rsync, which can run over ssh.
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LEARN ABOUT CENTOS
rollback_prepared
ROLLBACK
PREPARED(7) PostgreSQL 9.2.7 Documentation 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';
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))
PostgreSQL 9.2.7 2014-02-17 ROLLBACK PREPARED(7)