UNIX: TNS-12518,TNS-12536 When Listener Load Increases
(Doc ID 1920559.1)
Last updated on JANUARY 22, 2025
Applies to:
Oracle Net Services - Version 11.2.0.3 to 11.2.0.4 [Release 11.2]Oracle Database - Enterprise Edition - Version 19.13.1.0.0 and later
Gen 2 Exadata Cloud at Customer - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
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
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The issue can be reproduced at will with the following steps:
1. Run load test
BUSINESS IMPACT
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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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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |