ORA-12516, TNS:listener could not find available handler Weblogic error

Question

Hello,
I have a wierd issue while setting up a datasource in weblogic.
The database am trying to connect to is an Oracle DB and am using a LDAP based URL as the datasource URL in weblogic.
Service name : PSG03900_PEWTER_APPL.WORLD
The LDAP url given was jdbc:oracle:thin:@ldap://oid_ldap_server_ln.csfp.co.uk:1522/PSG03900_PEWTER_APPL.WORLD,cn=OracleContext,dc=uk,dc=csfb,dc=com
driver oracle.jdbc.xa.client.OracleXADataSource
When am trying to setup the datasource and test the connection configuration the test is successful. However when I try to activate the changes I get the following error:
An error occurred during activation of changes, please see the log for details.
weblogic.application.ModuleException:
Listener refused the connection with the following error: ORA-12516, TNS:listener could not find available handler with matching protocol stack The Connection descriptor used by the client was: (DESCRIPTION = (SDU = 8192) (TDU = 8192) (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = PSGLOD2008-SCAN.AP.HEDANI.NET)(PORT = 1522)) (LOAD_BALANCE = ON) (FAILOVER = ON ) ) (CONNECT_DATA = (SERVICE_NAME = PSG03900_PEWTER_APPL.WORLD) (FAILOVER_MODE = (TYPE = SESSION) (METHOD = BASIC) (RETRIES = 20) (DELAY = 5))))
The DBAs have confirmed to me that the database setup on their side is correct as they are able to do a tnsping and sqlplus connectivity succeeds.
I have also tried accessing the database through PL/SQL developer and am able to login however the weblogic activation fails for some wierd reason.
Could I request someone to enlighten me what I am missing here? I have been at it for days now.
Many thanks.
Best Regards,
Vinod
Edited by: 984452 on Jan 27, 2013 11:16 PM

Answer 1

Hi Kishore,
Thank you for the response.
The number of processes has been set to 500 and number of sessions set to 792 and currently the utilization has just reached 15% of the limit set.
We are using Weblogic 9.2 and trying to connect to Oracle 11g database, could the Oracle thin client being used in Weblogic have any issues connecting?
Many thanks.
Vinod