how to grant sysdba privileges to user

[ramanan ram]

i am using toad11.5 version ,here a schema name is(ex:sa) database name(ex:wttest) .i need full backup of wttest DB.
now i am trying to get through rman(recovery manager) script in databse browser.here, its showing one message 'you must have the sysdba privilege to use RMAN'

how can i give the sysdba privilege grant to the user .
but i tried,while i am open the user in tns,mode set as sysdba .but its showing insuffient privileges..

plz help..

[rski]

GRANT SYSDBA TO <USERNAME>

But only user with SYSDBA privilege can do that.

[ramanan ram]

rski i tried this query but insufficient privileges error display ..
thanks in advance..

[bharthi]

Hi Ramanan sir ,
Try this one,

grant connect ,resource,DBA to USER