Repeating TNS-12518, TNS-12549, ... Error: 11: 'Resource Temporarily Unavailable' Errors in listener log (Doc ID 430686.1)

Last updated on JULY 14, 2016

Applies to:

Oracle Net Services - Version 10.2.0.2 to 11.2.0.4 [Release 10.2 to 11.2]
Information in this document applies to any platform.
***Checked for relevance on 14-JUL-2016***
This problem can occur on any platform.

Symptoms

Listener log shows repeating error stack below for connection requests to an Oracle10g R2 instance:

 TNS-12518: TNS:listener could not hand off client connection
   TNS-12549: TNS:operating system resource quota exceeded
    TNS-12560: TNS:protocol adapter error
      TNS-00519: Operating system resource quota exceeded
       IBM/AIX RISC System/6000 Error: 11: Resource temporarily unavailable

Connection requests fail to connect to the Oracle instance.  This is clearly a resource depletion problem.

Cause

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