Index Full Scan used for DBMS_STATS Query even though there is a INDEX_FFS hint in Query
(Doc ID 1073987.1)
Last updated on JANUARY 30, 2022
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 to 184.108.40.206 [Release 11.1 to 11.2]
Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform.
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When gathering stats on indexes like below, some indexes take an extreme amount of time for statistics to be gathered.
Even though there is a index_ffs hint, INDEX FULL SCAN is used on the index.
For other indexes where the query runs faster , FAST FULL SCAN is indeed used.
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