Partitioned Indexes Created With 8M Initial Extent
(Doc ID 1989311.1)
Last updated on FEBRUARY 27, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Segments of type INDEX PARTITION or INDEX SUBPARTITION will be created with 8M initial extent in version 188.8.131.52, instead of 64K in earlier versions. Global indexes or indexes on non partitioned tables still have 64K.
If you create the index before the insert statement, the segment size is only 64K.
Issue can be easily reproduced on 184.108.40.206.0.
==64K are allocated in the situation the index is created when no rows are in the table:
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