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Looks like your database isn't running.
The database installation should have created a menu option to startup the database.
Thank you for your reply.
If I start database(start -> all programs -> Oracle XE -> Start database), in the command prompt it says:
But, if I right click on it and do Run as administrator, it says service has already started.
But same error after that when I try to create a connection with SQL Developer.
Did you try running the following command from a Windows console:
lsnrctl statusIf XE is a valid SID, the output should contain something like the following:
If not, then your listener.ora file may not have been created/updated properly. Or possibly you have a more complex environment with multiple listeners, or a single listener which may not be the listener that comes with Oracle 10g XE. For example, I have both 188.8.131.52 and 10g XE installed, but I run only the 11g listener (and disabled the 10g listener).
Services Summary... Service "xe.<yourdomain>" has 1 instance(s). Instance "XE", status UNKNOWN, has 1 handler(s) for this service...
That means I don't care about the tnsnames.ora and listener.ora files in my
C:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN directorybut instead had to alter those files in my
C:\app\<myuserid>\product\11.2.0\<dbhome>\NETWORK\ADMIN directoryso my database listener knows about the XE instance.
SQL Developer Team
Edited by: Gary Graham on Feb 21, 2013 3:02 PM
Fixed bad reference to tnsnames.ora -- I meant to say listener.ora
When I run this command, I get the following:
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 21-FEB-2013 18:09:13
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Message 1053 not found; No message file for product=NETWORK, facility=TNSTNS-12557: Message 12557 not found; No message file for product=NETWORK, facility=TNS
TNS-12560: Message 12560 not found; No message file for product=NETWORK, facility=TNS
TNS-00527: Message 527 not found; No message file for product=NETWORK, facility=TNS
In the Sevices, the following services are showing as Started:
Any idea how to fix it?
Well, it seems the most common approach when a message is not found is to:
1. Make sure you have the ORACLE_HOME environment variable set (at least on Linux. Mine, for example, is not set on Windows).
2. Suspect some aspect of your installation process failed.
For instance, in the following:
Message file not found: DB Down
And, if all else fails, it never hurts to fall back on a very popular "catch all" solution: reboot