The EUS Sessions Keep Persistent LDAP Connections (Doc ID 1055311.1)

Last updated on JANUARY 28, 2010

Applies to:

Advanced Networking Option - Version: 10.2.0 to 11.2.0.1 - Release: to 11.2
Information in this document applies to any platform.

Symptoms

For each user session connecting using LDAP authentication (EUS), there is one session between the database server and OID server that is left alive. In time, they tend to pile up until the OID server becomes unresponsive.
This fact can be checked using network utilities such as netstat (here on OID side):
netstat -an|grep 4031
*.4031 *.* 0 0 262144 0 LISTEN
14.64.33.73.4031 14.64.3.47.58979 263536 0 263536 0 ESTABLISHED
14.64.33.73.4031 14.64.3.47.58980 263536 0 263536 0 ESTABLISHED
14.64.33.73.4031 14.64.3.47.58981 263536 0 263536 0 ESTABLISHED
...

Setting:
NAMES.NO_PERSISTENT_RESOURCES = TRUE

does not help.

The OID setting: orclLDAPconnTimeOut on OID does work, only that it cuts down all the existing connections to the OID server, hence disrupting other activities that use LDAP for whatever purpose.

Cause

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