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DCD Does Not Work Due To Issue On Firewall (Doc ID 2877995.1)

Last updated on JULY 20, 2022

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

DCD(Dead Connection Detection) does not work and server processes count reduces after some time from 720 to 389 seen in ps data of OSWatcher.
Such server processes are identified by '(LOCAL=NO)'.

According to design, DCD packet should be regularly sent to client process in the interval of sqlnet.expire_time,
and gets acknoledgement from client:

Example:

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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