A user connect to the database is very slow.

Hi, all!
I met a problem in the database. A user(schema) connect to the database is very slow. and the user query the data is slow too.

And some errors in the listener.log :
23-Aus -2012 06:03:54 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=ora36)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxx.xxx.xxx.xxx)(PORT=24923)) * establish * ora36 * 12514
TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
23-Aus -2012 06:03:54 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=ora36)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxx.xxx.xxx.xxx)(PORT=23409)) * establish * ora36 * 12514
TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
23-Aus -2012 06:03:55 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=ora36)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=xxx.xxx.xxx.xxx)(PORT=9103)) * establish * ora36 * 12514
TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
How can I resolve this, thanks!

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