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  Oracle Tips by Burleson

Easy Oracle Automation
Chapter 4 -
Automatic Workload Repository and Automatic Database Diagnostic Monitor

Architecture of AWR

Automatic Workload Repository (AWR) provides a new infrastructure for collecting baseline statistics. Here is a partial list of the many statistics AWR in Oracle Database 10g collects:

  • Time model statistics based on time spent by the activities.

  • Object statistics that represent the access and usage statistics of database segments.

  • Some session and system statistics retained in v$sesstat and v$sysstat.

  • Some optimizer statistics for self-learning and tuning, ADDM, and Active Session History (ASH).

The following statistics are the most important ones used by AWR:

  • OS Statistics - CPU and Memory using v$osstat.

  • Wait Classes - CPU, application, commit, concurrency, scheduler, I/O, admin, configuration, commit, cluster, and network using v$event_name.

  • Time Model - Connection management, PL/SQL compilation, parse, SQL execution, and PL/SQL execution using v$sys_time_model.

  • SQL Statistics - SQL statistics (PL/SQL Java time, wait-class time), bind variables, efficient top SQL based on CPU, elapsed and parse statistics.

The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

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