[SOLVED] Oracle - TNS:no appropriate service handler found

This means that you have too many database connections basically. Unfortunately since the demise of svrctl, it also means that you as a DBA cannot connect internal to do something about it!

You need to either ask a couple of users to log out, or you need to kill some sessions at the OS level. Once you managed to connect, see if you can spot anyone making abnormal numbers of connections. If you can't find anything you will need to increase the init parameter 'processes'. Unfortunately, this will require a restart of the database to take effect:

please connect the oracle 10g's system first : SQL>connect system/system and press enter

Note. The maximum allowed processes is one less than the init parameter 'processes'

credited to: http://www.shutdownabort.com/errors/ORA-00020.php


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