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Orcl_Error_ORA_12520.

Posted on 2011-09-02
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Last Modified: 2012-05-12
We have a SAP client that runs batch processes against oracle.
Recently we noticed

OCI call <OCIServer Attach> for connection <tips> failed: <ORA-12520: TNS: listener could not find available handler for requested type of server.

Is this related to number of connections allowed in PROCESSES parameter?

Any ideas for troubleshootng and resolving.
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Question by:sam15
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6 Comments
 
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 36475507
I assume you have looked at the cause and action for this error:
http://ora-12520.ora-code.com/

Maxing out processes might cause this.  When you receive this error how many connections are there and what is processes set at?
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Author Comment

by:sam15
ID: 36475648
I looked at this whioh does not sound it is related to number of connections
http://download.oracle.com/docs/cd/B14117_01/network.101/b10775/troublestng.htm#CEGJGEEC

Processes=150

and normally number of session is about 100.

Does oracle count inactive processes as part of the 150 max? Someone said there is a bunch of dead unix processes showing. Does oracle normally kill the server processes after they are idle or certain time or it keeps it as long as a client is there.
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slightwv (䄆 Netminder) earned 500 total points
ID: 36476211
If they aren't in v$session then they aren't counted.

Oracle is supposed to clean up 'dead' connections but there have been several 'features' where connections are not recognized as dead and are left around.

150 is pretty low.  I would go ahead and increase it just for grins.
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Author Comment

by:sam15
ID: 36476461
so it counts INACTIVE sessions as part of the 150.
How does oracle clean up the dead connections/sessions? is there a parameter to make this faster?

Also, i found out they are not using Connection ppoling. Can this be setup in the oracle client or this is something the client application has to do?
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by:slightwv (䄆 Netminder)
ID: 36476715
I ran into issues in an ASP setup many years ago where the connections were not 'disposed' and Oracle would still see them as active and not clean them up.

I'm not sure of any setting that will detect these faster or more accurately.

Pooling can help but not if the app properly disposes of old connections.  If not, once the pool fills up, new connections will be created and you will have the same issue.
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Author Comment

by:sam15
ID: 36476748
but where do you set the connection pooling? is it using the client application or the oracle client config file?

According to this

http://www.orafaq.com/wiki/SQL*Net_FAQ

http://www.orafaq.com/wiki/Sqlnet.ora#sqlnet.expire_time


I am not sure if configuring SQLNET.EXPIRE_TIME to 1 minute will help or setting up prespawned servers or multiple listeners.

or is it simplu bumping up the PROCESSES prameter
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