Logical log backups are used mainly to achieve high availability
and reliability of the Informix® server
used by Rational® Synergy
as the RDBMS engine. Without logical log backups, you can restore
your Informix server to
the last archive. However, all work done between the last archive
and the time the Informix server
was corrupted might be lost. If logical log backups are activated,
you can recover the Informix server
to the last committed transaction before the Informix server was corrupted.
Logical log files are filled with logical log records. As they
are filled, they must be copied to a backup device (typically a tape
drive). Logical log backup accomplishes the following tasks:
- Stores the logical log records on the specified backup device.
Then, they can be used to roll forward transactions, if a data restore
operation requests such actions to be taken.
- Frees logical log file space to receive new logical log records.