Global SQL Optimization

Oracle professionals must always undertake to perform holistic tuning before delving into the tuning of specific SQL statements, an approach that has been the bread and butter of successful corporate DBA's since the earliest days of Oracle6.

In Oracle 11g, we see this holistic approach codified in the SQL Performance Analyzer (SPA), a new tool to simplify the setting of optimizer statistics and initialization parameters. In SPA, the DBA chooses a representative workload and runs it, comparing the overall SQL execution plans with different sets of CBO statistics and settings for the silver bullet initialization parameters.

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