Currently I installed Oracle RAC 11g .
In enterprise manager I find following error.
Failed to connect to database instance: ORA-12505: TNS:listener does not currently know of SID given in connect descriptor (DBD ERROR: OCIServerAttach).
Can anyone plz suggest how to rectify it.
Are you sure you provided the good SID in Enterprise Manager ? Make lsnrctl status on your RAC server, you should have the SID registered in the listener. This SID sould be used in the connect descriptor of your target in EM.
i) Check the listener control status and it should listen the sid for what you configuring the enterprise manager. Check the hostname in listener.ora file
ii) Check the tns entry is there or not.