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 220.127.116.11 [Release 7.3]
HP OpenVMS Itanium
HP OpenVMS Alpha
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:
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