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Cursor Pin S Wait On X High During Select With Parallel Or Gather Schema Stats (Doc ID 1350803.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.1 to 11.2]
Information in this document applies to any platform.
Reviewed 09-July-2015.


The "cursor: pin S wait on X" occurs and it is high during select with
parallel or gather schema stats with parallel degree.

The <Patch 7338648> doesn't fix this behavior.

the ASH report:

Top Event Values

Event % Event

cursor: pin S wait on X 25.39
log file parallel write 2.07
db file sequential read 1.04
direct path read 1.04
direct path sync 1.04

After installed the <Patch 7338648>:

Top Event Values

Event % Event

cursor: pin S wait on X 28.00
db file sequential read 7.20
log file parallel write 2.40
control file parallel write 1.60


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