How to Diagnose Slow TNS Listener / Connection Performance

(Doc ID 557416.1)

Last updated on FEBRUARY 14, 2017

Applies to:

Oracle Net Services - Version 9.2.0.2 to 11.2.0.4 [Release 9.2 to 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [Release 11.2]
Information in this document applies to any platform.
Connections to database are slow or intermittently fail
TNS listener performance is slow
Versions 9.2 onwards



Goal

How to diagnose slow TNS listener issues or slow connections. Often ORA-12541 and ORA-12535 errors can be due to stressed or busy TNS listener.

Solution

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