Exadata: Performance Issue During Cell Scrubbing (Doc ID 2209639.1)

Last updated on DECEMBER 29, 2016

Applies to:

Oracle Exadata Storage Server Software - Version 12.1.2.2.0 and later
Information in this document applies to any platform.

Symptoms

During Exadata Cell Scrubbing time database may see performance issue. During this time customer Database experiences increased Commit time, Logfile
synch, flashback log file sync. There is an 20%-30% increase in these waits events during the Scrubbing activity

AWR report might show increased wait for 'log file parallel write' or 'log file sync' or 'flashback log file writ'". The avg. wait time
might go up when compared to the Non scrubbing time.

You can check the the scrubbing time on the cells using below commands

cellcli –e list cell attributes name,hardDiskScrubInterval

Example output : exatestcel12 biweekly !! Enabled for biweekly

 

 

Cause

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