AWR Snapshots Missing Intermittently Accompanied by Spike in CPU from MMON Process (Doc ID 1466333.1)

Last updated on APRIL 29, 2015

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 and later
Information in this document applies to any platform.

Symptoms

    1. When querying the view DBA_HIST_SNAPSHOT, you find that snapshots are missing on occasion.  They should occur hourly (by default), but they are not consistently being collected on the hour.
    2. You may also notice a surge in CPU utilization occasionally at the top of the hour.

Changes

 There have been no changes to the server parameter file or to the Oracle Database software home.

Cause

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