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Analysis of Active Session History (Ash) Online and Offline (Doc ID 243132.1)

Last updated on SEPTEMBER 22, 2022

Applies to:

Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database 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
Information in this document applies to any platform.


The note describes how to dump ASH information to trace to do online or offline analysis.

The ASH infrastructure provides a single V$ view (V$ACTIVE_SESSION_HISTORY), to view the in-memory contents of ASH along with a way to dump the in-memory contents of its circular buffer into an external file in a human readable format. The ASH dump file can be transported to another system,  imported onto a user table, and analyzed using the ADDM in that system.


 The intended audience is for database DBA's


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