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Oracle Connection Manager Load Balancing Problems (Doc ID 2632799.1)

Last updated on JUNE 30, 2021

Applies to:

Oracle Net Services - Version 12.2.0.1 to 12.2.1.3.0 [Release 12.2]
Information in this document applies to any platform.

Symptoms

Clients got timeout error or cannot connect although there are other available gateways on the node where the first gateway has "state:blocked".

After few number of days of a CMAN reboot the clients timed out or could not connect to CMAN. And we have to reboot CMAN again
At server level we detected a "state: blocked" when entering "show services" by cmctl

CMCTL:CMAN_XXXXXX> show services
Services Summary...
Proxy service "cmgw" has 1 instance(s).
Instance "cman", status READY, has 4 handler(s) for this service...
Handler(s):
"cmgw001" established:13152 refused:0 current:768 max:768 state:blocked  <<<<<<<<<<<<<<< First gateway reached the max connection limit and showing state as blocked 
<machine: localhost, pid: 6580>
(ADDRESS=(PROTOCOL=ipc)(KEY=#6580.1)(KEYPATH=/var/tmp/.oracle_5432100))       
"cmgw000" established:181403 refused:0 current:653 max:768 state:ready                    
<machine: localhost, pid: 6578>
(ADDRESS=(PROTOCOL=ipc)(KEY=#6578.1)(KEYPATH=/var/tmp/.oracle_5432100))
"cmgw003" established:38 refused:0 current:38 max:768 state:ready
<machine: localhost, pid: 14175>
(ADDRESS=(PROTOCOL=ipc)(KEY=#14175.1)(KEYPATH=/var/tmp/.oracle_5432100))
"cmgw002" established:39 refused:0 current:39 max:768 state:ready
<machine: localhost, pid: 14173>
(ADDRESS=(PROTOCOL=ipc)(KEY=#14173.1)(KEYPATH=/var/tmp/.oracle_5432100))

Cause

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In this Document
Symptoms
Cause
Solution
References


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