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Approaches to self-tuning Oracle databases

Until Oracle evolves into a complete self-tuning architecture, the Oracle DBA is responsible for adjusting the RAM memory configuration according to the types of connections. In general, we can use queries against the v$ structures and STATSPACK to locate those times when Oracle connections change their processing characteristics. We see three types of approaches to automated tuning:

* Normal scheduled re-configuration – A bi-modal instance that performs OLTP and DSS during regular hours will benefit from a scheduled task to re-configure the SGA and PGA.
* Trend-based dynamic reconfiguration – You can use STATSPACK to predict those times when the processing characteristics change and use the dbms_job package to fire ad-hoc SGA and PGA changes.
* Dynamic reconfiguration – Just as Oracle dynamically re-distributes RAM memory for tasks within the pga_aggregate_target region, the Oracle DBA can write scripts that steal RAM from an underutilized area and re-allocate these RAM pages to another RAM area.

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


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