ORA-12514

ORA-12514: TNS:listener does not currently know of service requested in connect descriptor



One reason is default listener registration is DYNAMIC you have to change DYNAMIC to STATIC.
edit your listener.ora file like below

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.1.0\Db_1)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = orcl)
(ORACLE_HOME = C:\oracle\product\10.1.0\Db_1) )
)

C:\>LSNRCTL stop
C:\>REM WAIT FEW SECONDS
C:\>LSNRCTL start


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