IBM E16RMLL-I Implementation Guide - Page 229
Setting the expansion trigger
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Process Number -------- 76 Process Description Database Backup Status Full backup: 0 pages of 1500 backed up. Current output volume: LTO888 tsm: LOCHNESS_SERVER1>query dbbackuptrigger Full Device Class Incremental Log Full Device Percentage Class LTO2-DC LTO2-DC 75 Incrementals Between Fulls -----------6 Minimum Backup Interval (minutes) --------- 0 Minimum Log Percentage Freed ---------0 Notice that once we defined the database backup trigger, a database backup was immediately started. To verify that the define dbbackuptrigger command was successful, issue the query dbbackuptrigger command. Tip: The combination of the dbbackuptrigger and rollforward mode may require some tuning attention. As with most automated processes, regular operational monitoring is required. 5.5 Setting the expansion trigger Tivoli Storage Manager lets you fully automate the process of increasing the database and recovery log, whenever necessary. For example, suppose you have a 4 GB database and a 2 GB recovery log. You want to increase the size of the database by 25% when it is 85% utilized, but not to more than 8 GB. You also want to increase the recovery log by 30% when it is 75% utilized, but not to more than 4 GB. Note: Setting a space trigger does not mean that the percentage used in the database and recovery log will always be less than the value specified with the FULLPCT parameter. Tivoli Storage Manager checks utilization when database and recovery log activity results in a commit. Deleting database volumes and reducing the database does not cause the trigger to activate. Therefore, the utilization percentage can exceed the set value before new volumes are online. Chapter 5. Database and recovery log 199
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