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

Last updated on FEBRUARY 02, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.6 to 11.2.0.2 [Release 11.1 to 11.2]
Information in this document applies to any platform.
Reviewed 09-July-2015.

Symptoms

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.

DIAGNOSTIC ANALYSIS:
--------------------
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

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms