Oracle 12c In-memory Performance issue when there are partitions/subpartitons indexes marked unusable
(Doc ID 2106224.1)
Last updated on FEBRUARY 27, 2019
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
SQL running against in-memory and non in-memory partition/subpartitions takes longer because there are partition/subpartitions indexes marked unusable, which are not being scanned by the SQL, leading Full Table Scan instead of Index Range Scan access.
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