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Easy Oracle Automation
Chapter 6 - Automatic System Resource Management

Automatic Shared Memory Management (ASMM)

For example if sga_target is set to 8g and db_16k_cache_size is set to 1g, then the total size for the four auto-tuned components is limited to 7g.  The 7g size includes the fixed SGA and log buffer, and only after those have been allocated is the rest of the memory divided between the auto-tuned components. A list of parameters and their values can be accessed using the v$parameter view.

More about using memory advisor through OEM will be presented in the next section.

Using Memory Advisor through OEM

The Memory Advisor can be used only when the automatic memory tuning is disabled. This will help to tune the size of memory structures. The Memory Advisor has three advisors that give recommendations: Shared pool in SGA; Buffer Cache in SGA; and PGA.

To use Memory Advisor and tune its underlying structures, do the following steps:

1. Click on Memory Advisor in the Advisor Central Page.

Figure 6.1 - Memory Advisor


The Memory Parameters page: The SGA page appears. This page has all the details on memory usage for the System Global Area. The shared pool and buffer cache are part of the SGA. For more information on the structure shown here, click on Help.

Figure 6.2 - Memory Parameters


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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