ORA-12514 Error coming whenever trying to connect to database in TOAD

Question

Hi,
When i'm logging in database(10g) through TOAD, i'm getting the error as:
"ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor"
My listener.ora contains
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = E:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
My tnsnames.ora contain:
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
The listener status is as follows:
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Produ
ction
Start Date 05-OCT-2008 06:40:42
Uptime 0 days 0 hr. 16 min. 31 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File E:\oracle\product\10.2.0\db_1\network\admin\listener.o
ra
Listener Log File E:\oracle\product\10.2.0\db_1\network\log\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
The database is up and running and I've stopped-started the listener.
Still the error occurs. Could anyone suggest what can be done.
Regards,
Souvik

Answer 1

The error basically means that the connection service which you are requeting in your connection string is not yet to known to the listener of yours. See here the output of the listener's supported services from your post.
Listening Endpoints Summary...
+(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))+
+(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))+
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
It clearly shows that the listener is only working to listen for the PLSExtproc service which is meant for external procedures.
Is the database just started? If that's the case than it may take a while to get the PMON register the db with the listener. Or you can issue,
alter system register from your db's sql prompt which can ask listener for immediately register the db with it. Try this command and post feedback. If that won't work than you may have to manualy register your db with the listener.
HTH
Aman....