I am trying to shutdown the system, then I want to mount it. I have tried this:
SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount; ORA-12514: TNS:listener does not currently know of service requested in connect descriptor SQL> startup mount; ORA-24324: service handle not initialized ORA-01041: internal error. hostdef extension doesn't exist
I have googled for solution but I can't found the exact reason that causes it to go wrong.