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Moving toward a self-tuning Oracle database

With these new dynamic SGA features in Oracle, we are moving toward an architecture where the Oracle DBA can monitor UNIX RAM memory usage and re-configure the SGA and PGA regions according to existing usage patterns.

Oracle offers a degree of self-tuning capability with the new pga_aggregate_target parameter. By allowing Oracle to manage RAM memory demands according to the demands of each task, Oracle has been able to use sophisticated algorithms to improve the speed of RAM intensive tasks such as hash joins and large sorts.

However, the Oracle DBA is now able to dynamically de-allocate RAM memory from one area and re-allocate the RAM to another area of the SGA.

The above is an excerpt from the "Oracle UNIX Administration Handbook" by Oracle press, authored by Donald K. Burleson.

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