sql - ORA-01219: database not open: queries allowed on fixed tables/views only

Question

I Am using oracle 11g and SQL developer tool. When i tried to retrieve rows from db i am getting error message as :-

ORA-01219: database not open: queries allowed on fixed tables/views only)

I looked for sgadef.dbf file and it was missing in home directory.. Can someone help me to make it working.

Answer 1

First of all check the status of the instance you work with (this may need to connect under administrator account):

select status from v$instance;

Probably you will get

STATUS
------------
MOUNTED

Under sys account try to complete

ALTER DATABASE OPEN;

and check that it's completed successfuly. If not - please share the result of output and alert log in your question.