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V$ACTIVE_SESSION_HISTORY / DBA_HIST_ACTIVE_SESS_HISTORY / V$ASH / X$ASH are Empty (Doc ID 2984197.1)

Last updated on JULY 20, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

- V$ACTIVE_SESSION_HISTORY and DBA_HIST_ACTIVE_SESS_HISTORY are empty.
- V$ASH and X$ASH are empty.
- The parameter statistics_level is set to TYPICAL.
- The parameter _ASH_ENABLE=true and _ASH_SIZE is set to Non-zero.
- MMON and MMNL are running. their trace files
- No errors in database Alert log.

Cause

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In this Document
Symptoms
Cause
Solution
References


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