SELECT on a Single Column (or Only a Few Columns) Does Not Partition Prune
(Doc ID 2032295.1)
Last updated on FEBRUARY 27, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Information in this document applies to any platform.
The number of columns in a select list seems to determine whether partition pruning is used or not, when all else stays the same.
Example: (Note: BUS_DTE is the partitioning key for table FACT_PERFORMANCE_SEC)
A. Here, a single column is being selected, which results in an FTS on all 481 partitions of FACT_PERFORMANCE_SEC.
The only thing in the query that changes is the number of columns in the select list.
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document