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Rules for changing memory sizes

There are three conditions that effect the decision to re-size the Oracle RAM regions, one for the data buffer cache, another for the shared pool and the third for PGA memory usage.

* db_cache_size – We may want to add RAM to the data buffer cache when the data buffer hit ratio falls below a pre-defined threshold.
* shared_pool_size – A high value for any of the library cache miss rations may signal the need to allocate more memory to the shared pool.
* pga_aggregate_target – When we see high values for multi-pass executions, we may want to increase the available PGA memory.

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

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