HI sir, i got a problem while using oracle 11g,where it is asking username

I installed Oracle11g R1 DB version 11.1.0.6 and upgraded it to 11.1.0.7 using patch set 6890831 .After that i wantd to use SQL * plus,but it is asking username & passwords. But while installing it didn't ask for any usernames ,so i tried all default usernames but didnt work. Can any one help me.

Hi,
After applying patch did u create Listener(using netca command) and created a database(using dbca command) ?
I guess u have not created the database where u would be providing the username and password to login to sqlplus.
If u have any other queries let me know.
Thanks,
Edwin

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