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RDBPROD: Poor Performance With CONJUNCT: UNKNOWN (Doc ID 2215181.1)

Last updated on FEBRUARY 21, 2019

Applies to:

Oracle Rdb Server on OpenVMS - Version 7.3 to 7.3.2.0 [Release 7.3]
HP OpenVMS Itanium
HP OpenVMS Alpha

Symptoms

A SQL query specifying "where (table.column=null )" produces a poor optimizer strategy, with a sequential scan on a table that contains 4.3 million+ rows.

Using the EXECUTION flag, the sequential scan can be seen:

Changes

Upgrade from Rdb 7.2.x

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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