TNS-12520 Occurs During Logon Storm or Spike in Number of Incoming Connections

(Doc ID 2321889.1)

Last updated on NOVEMBER 01, 2017

Applies to:

Oracle Net Services - Version 11.2.0.4 to 12.2.0.1 [Release 11.2 to 12.2]
Information in this document applies to any platform.

Symptoms

DB init parameter processes is set to 3000, TNS-12520 is seen in listener.log intermittently even v$resource_limit only shows a max value 2723 for process MAX_UTILIZATION:

 

Cause

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