If you cannot connect to the database, refer to the section Database connection issues for troubleshooting
suggestions.
If you can connect to the database and you previously started
the server with forced recovery, refer to the section Analysis of Allocation Problems for information
on verifying database allocation and recovering leaked blocks.
If you can connect to the database, but suspect the database
may be inconsistent, refer to the section Database Verification for information
on checking the consistency of your database.