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Easy Oracle Automation
Chapter 6 -
Automatic System Resource Management

AWR in Memory Statistics

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

  • v$sysstat, v$sql, v$segment_statistics, v$sys_time_model, v$sysmetric_history, v$active_session_history.

The AWR collects performance data on resources and stored the data insidewrh$ tables. AWR takes snapshots of the system every 60 minutes. Therefore, AWR does not contain enough information to perform current analysis.  Typically, the nature of current analysis requires information on activity in the last five to ten minutes. 

These tables are viewable through Oracle Enterprise Manager or through the dba_hist views. The AWR captures all important SGA metrics about the SGA in the dba_hist_sga views and interfaces with the ADDM. SGA advisory functions dynamically optimize the shared pool, data buffer cache, Java pool, and PGA memory areas.  

Figure 6.8 - SGA information in the dba_hist_sga views


ASH and its influence on memory statistics will be reviewed next.

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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