Incorrect Estimated Cardinalitiy For Partitions After Copying Statistics From Newer Partition to Older Partition
(Doc ID 2515071.1)
Last updated on MARCH 18, 2022
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Information in this document applies to any platform.
- Incorrect Estimated Cardinality (E-Rows) for Partition(s) even after the statistics are copied at sub-partition level.
- DBMS_XPLAN.DISPLAY_CURSOR output shows the E-Rows as 1 for the partitions for which the statistics are copied from the source partition.
- Table is range-partitioned by date column and further list subpartitioned by CHAR or NUMBER column.
- COPY_TABLE_STATS is used such that the destination partition lies before the source partition as per the date.
- Problem does not happen when COPY_TABLE_STATS is used such that the destination partition comes after the source per the date range.
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Partitioned Table is created as below:-
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