Active Session Count Increases, and V$SESSION.USERNAME is NULL for Majority of User Sessions (Doc ID 1490865.1)

Last updated on JULY 20, 2017

Applies to:

Advanced Networking Option - Version 10.2.0.4 and later
Oracle Database - Enterprise Edition - Version 10.2.0.4 and later
Information in this document applies to any platform.

***Checked for relevance on 21-Jul-2017***

Symptoms

The number of sessions in the V$SESSION view is far greater than what you customarily find -- perhaps two or three times as many sessions as usual.  When you examine V$SESSION, you find that the USERNAME for most sessions is NULL, but the sessions are listed as being active.  The customers accessing the database may report logon timeouts.

The majority of the wait events in V$SYSTEM_EVENT is on the null event.

Changes

 You have made no changes, either to the Oracle Database software home nor to the client software.

Cause

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