IBM E16RMLL-I Implementation Guide - Page 227
set logmode, set logmode rollforward, query status
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recovery log. Changes made to the database since the last backup cannot be recovered if the database is lost. Database backups can only be used to perform point-in-time recovery (that is, to the time of the last database backup). In NORMAL log mode, you need less space for the recovery log, since Tivoli Storage Manager deletes transactions once they have been committed to the database. ROLLFORWARD In rollforward mode, Tivoli Storage Manager caches all transaction changes made to the database since the last time it was backed up. Tivoli Storage Manager deletes cached transactions only after a successful database backup. The cached transactions can be used to restore the database to its most current state (roll-forward recovery) after loading the most current database backup series. A database backup series created in ROLLFORWARD mode can be used for either point-in-time recovery or roll-forward recovery. We recommend ROLLFORWARD mode for the superior recoverability it brings to the server database. Note that in ROLLFORWARD mode, more recovery log space is required. When you change the log mode to ROLLFORWARD, if the database backup trigger is set, a database backup will immediately run. To configure the log for ROLLFORWARD mode, issue the set logmode command, as shown in Example 5-5. The command takes effect immediately. You do not need to restart the server. Example 5-5 Set logmode to roll forward tsm: LOCHNESS_SERVER1> set logmode rollforward ANR2294I Log mode set to ROLLFORWARD. To check that the command was successful, use the query status command and note the Log Mode field. Example 5-6 Check status for log mode tsm: LOCHNESS_SERVER1>query status Server Name: LOCHNESS_SERVER1 Server host name or IP address: 9.43.86.84 ... Retry Period: 5 Minute(s) Scheduling Modes: Any Log Mode: RollForward Database Backup Trigger: Not Defined BufPoolSize: 261,120 K ... Chapter 5. Database and recovery log 197
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