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RDBPROD: Performance Advice on Using WHERE IN (SELECT FROM table) (Doc ID 602499.1)

Last updated on APRIL 16, 2024

Applies to:

Oracle Rdb Server on OpenVMS - Version 7.1.0.4 and later
HP OpenVMS Itanium
HP OpenVMS Alpha



Goal

Performance advice on using WHERE IN (in-list) when the in-list is an embedded SELECT:

  1. TAB1 contains 2 million rows and TAB2 contains 50000. Both have indexes on COL1.

Solution

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Goal
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