Thursday, June 5, 2008

Self-Tuning Oracle9i Database: Oracle SGA

As DBAs become more sophisticated in their self-tuning endeavors, many Oracle metrics may become self-tuning. In Oracle Database 10g, more self-tuning capability will be seen than ever before. For example, the dynamic memory allocation features of Oracle Database 10g make it possible to create a self-tuning Oracle SGA. By means of demonstration, in this paper the author will explain how to examine the Oracle instance in Oracle 9i Database and adjust the memory regions for sort_area_size or pga_aggregate_target, large_pool_size, sga_max_size and db_cache_size according to the processing demands on the server and within the database. The techniques discussed are based on the use of Statspack to monitor memory regions over time and develop signatures of system resource usage.

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