Backup concept

The backup concept in SESAM/SQL comprises the following components:

• the transaction concept, which guarantees data consistency during operation, and

• the recovery concept, in which various different measures are used to recover data consistency when errors occur.

This chapter describes

• the transaction concept

• transaction logging as the basis for transaction recovery and system recovery

• the handling of transactions during system recovery

• possible error situations and suitable recovery measures

• media recovery, based on SESAM backup copies and logging

• the use of replications

• backup-specific files.