I have an Oracle 10g database which is connected to another server with instance client. Problem is all of users(SYS/SYSTEM/SYSMAN/FATASAN/JAVAHER) are expired (I forgot to change expire date) and also sqlpus and instance client are faced with ORA-12560 error (Both servers were good but now I have no connection to data!)
How can I login into my own database when all usernames are expired ?!