Optimizing SQL Insert Performance - GSE Belux
Optimizing SQL Insert Performance - GSE Belux
Optimizing SQL Insert Performance - GSE Belux
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Identifying Unreferenced Indexes<br />
• Additional indexes require overhead for<br />
– Data maintenance<br />
• INSERT, UPDATE, DELETE<br />
– Utilities<br />
• REORG, RUNSTATS, LOAD etc<br />
– DASD storage<br />
– Query optimization time<br />
• Increases DB2 Optimizer’s choices to consider<br />
• But identifying i unused indexes is a difficult task<br />
– Especially in a dynamic <strong>SQL</strong> environment<br />
42<br />
© 2010 IBM Corporation
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