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.