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You need to ask the DBA to start the database. Or, start it up yourself:
[url http://docs.oracle.com/cd/B19306_01/server.102/b14231/start.htm#sthref491]Find out more.
You are connecting to the database using AS SYSDBA. This is an extremely powerful connection - you are in the database as SYS, not as a regular user. Consequently it is incumbent on you to understand the database and how to use it properly.
I would suggest that if you don't even understand how to start the database you should not connect as SYSDBA.