To set the mode for saving recovery log records, complete the following field and then click Finish, or click Cancel to end the task. The log mode determines how long Tivoli Storage Manager saves records in the recovery log and the kind of database recovery you can use.
Select one of the following modes for saving recovery log records:
Normal | Specifies that Tivoli Storage Manager saves only those
recovery log records that are needed to recover the
database in case of a system failure. When the log mode is Normal, no automatic backups are performed based on the database backup trigger. Tivoli Storage Manager deletes recovery log records that were required to perform roll-forward recovery or to restore a single database volume. However, you can still use existing database backups to perform point-in-time recovery. Tivoli Storage Manager keeps log records necessary to resume database processing if a system failure occurs. The default is Normal. |
Roll forward | Specifies that Tivoli Storage Manager saves enough log
records to ensure that the database can be restored to
its most current state using the most recent database backup
series and recovery log records. If issued from an administrative
client (not from the server console), Tivoli Storage Manager asks
whether to proceed with the change to Rollforward
mode. If the database trigger is defined, Tivoli Storage Manager automatically and immediately runs a full backup. If the database trigger is not defined when you change the log mode from Normal to Rollforward, a full backup is required the next time a backup is run. If you do not specify Type=Full the next time you back up the database, the backup fails. If you run the DSMSERV FORMAT or the DSMSERV LOADFORMAT command, Tivoli Storage Manager resets the log mode to Normal. |