UNIX: TNS-12518,TNS-12536 When Listener Load Increases (Doc ID 1920559.1)

Last updated on JUNE 07, 2017

Applies to:

Oracle Net Services - Version 11.2.0.3 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.

Symptoms


During heavy load testing, the following errors are reported in the listener log and the connection are rejected:


TNS-12518: TNS:listener could not hand off client connection
TNS-12536: TNS:operation would block
 TNS-12560: TNS:protocol adapter error
  TNS-00506: Operation would block
  Linux Error: 11: Resource temporarily unavailable


STEPS
-----------------------
The issue can be reproduced at will with the following steps:
1. Run load test

BUSINESS IMPACT
-----------------------
The issue has the following business impact:
Due to this issue, remote client connections are failing and the listener log is throwing errors.

Changes

 This is likely a new installation or there has been a significant increase in the number of incoming connections.

Cause

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