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Chapter 4 - Automatic Workload Repository and Automatic Database Diagnostic Monitor

What is AWR?

In-Memory Statistics Collection Facility – This is useful for 10g components to collect statistics. These metrics are stored in memory for performance reasons and are accessible through v$ performance views. The memory version of the statistics is written to disk regularly by a new background process called Memory Monitor or Memory Manageability Monitor (MMON).

            AWR Snapshots - represent the persistent portion of the facility. AWR snapshots can be viewed through data dictionary views.

The AWR statistics are kept in persistent storage to survive any database instance crashes and to provide historical data for baseline comparisons.

Now that the data has been collected, the next topic to cover is what can be done with it.

Uses of AWR

Automatic Workload Repository (AWR) helps with collection and retention of Oracle Database 10g statistics for self-tuning. Oracle Database 10g captures and retains this historical data without any DBA intervention.

The historic data is used for analysis of performance problems that occurred during a certain time period in the past and for trend analysis. After a problem had been reported in previous versions of Oracle, the DBA had no way of recreating the problem unless it had been written to alert logs. Using AWR, if there is a record of system events, the cause can be identified and solutions developed for problems that happened in the past.

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