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How to Collect Oracle Sessions (Processes) Information when Cannot Collect System State Dump or Hanganalyze Output (Doc ID 2371213.1)

Last updated on NOVEMBER 04, 2019

Applies to:

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 Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 10.2.0.1 and later
Information in this document applies to any platform.

Purpose

Collecting oracle sessions (processes) information if you missed to take system state dump (SSD) or hanganalyze output (HA).

This information does not replace SSD or HA, but it could be supplementary  information to help locking and hanging issues.

There are two sources to get oracle session information:

1. (g)v$active_session_history

This is in ASH memory area which is part of shared pool and have every 1 second sample.

2. DBA_HIST_ACTIVE_SESS_HISTORY

This is backed from Ash area to SYSAUX tablespace and have every 10 seconds sample.

If hanging or locking issues happens and instance is not bounced, then hurry to get data from (g)v$active_session_history before it is purged.

 

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
References

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