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Troubleshooting: Missing Automatic Workload Repository (AWR) Snapshots and Other Collection Issues (Doc ID 1301503.1)

Last updated on JUNE 30, 2021

Applies to:

Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.
Oracle RDBMS Automatic Workload Repository



Purpose

The purpose of this document is to describe the diagnostic data that can be collected and the corrective steps that can be taken when encountering issues with slow, hung or missing AWR snapshots.

AWR snapshots may fail to create for a number of reasons, the main two being:

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 Detecting Missing snapshots
 Snapshots creation does not start
 Database Settings and Status
 STATISTICS_LEVEL setting
 Database is Closed
 Database Open Mode
 Snapshots creation starts but does not complete
 General Reasons
 ADDM takes a significant amount of time to complete
 Workarounds
 Complications
 Timing information for each individual table flush
 Known Issues
 Community Discussions
References

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