How To Find Optimal Index Key COMPRESS Level For Indexes
(Doc ID 601690.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Information in this document applies to any platform.
***Checked for relevance on 04-JUN-2014***
In a test comparing resulting object size and the COMPRESS integer for index key compression, increasing the COMPRESS integer when creating/altering indexes does not always result in a smaller size.
How do you know what the value of N should be for this SQL?
ON test_table (keycol1, keycol2, keycol3, keycol4, keycol5, keycol6)
The following data was obtained by substituting various values for COMPRESS:
152 COMPRESS 1
144 COMPRESS 2
120 COMPRESS 3 <-- this would appear to be optimal for this example
168 COMPRESS 4
200 COMPRESS 5
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