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optimizer_index_cost_adj

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Database Optimization: Tweaking Oracle SQL performance parameters: Oracle Corporation has invested millions of dollars in making the cost-based SQL optimizer CBO one of the most sophisticated tools ever created. The job of the CBO is to always choose the most optimal execution plan for any SQL statement.However, there are some things that the CBO cannot detect, which...; Tags: Programming languages, Databases, performance, database, Donald Burleson, optimizer_index_cost_adj, CBO, Oracle Corp., full-table scan; Technical articles 2004-01-26

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Database Optimization: Measuring Oracle disk I/O speed: Because all Oracle databases retrieve and store data, the relative cost of physical disk access is an important topic. In Oracle, we see two types of data block access:db file sequential read—A single-block read (i.e., index fetch by ROWID)db file scattered read—A multiblock read (a full-table scan, OPQ, sorting)Physical disk...; Tags: disk speed, Oracle Corp., Donald Burleson, disk, I/O, full-table scan, database; Technical articles 2004-03-01
Use Oracle9i full-index scans to read data quickly: The Oracle9i optimizer has been enhanced to further streamline SQL query performance. Learn more about these new features and how you can use them to read indexes without touching the table itself.In keeping with Oracle’s commitment to add intelligence to SQL query optimization, the full-index SQL execution plan has been...; Tags: Databases, Oracle9i, Donald Burleson, full-index scan, Oracle Corp., SQL; Technical articles 2002-11-25
Take advantage of Oracle9i full-index scans: Database administrators are constantly working to improve query performance. Oracle provides a powerful tool to facilitate the search by monitoring and tweaking RAM memory usage.In keeping with Oracle’s commitment to add intelligence to SQL query optimization, the full-index SQL execution plan has been enhanced to provide support for function-based indexes...; Tags: Programming languages, Databases, Donald Burleson, Oracle9i, full-index scan, Oracle Corp., SQL; Technical articles 2002-12-02

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