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

Last updated on DECEMBER 26, 2019

Applies to:

Advanced Networking Option - Version and later
Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform.

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


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.


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


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