Error 404 Page Not found when trying to access Ste Collection

Unable to access Site Collection in SharePoint 2010  Error Message:  Error 404 Page Not found

Check the site status in IIS to see if it is started
Try to browse the site from IIS.
Try restarting the site.
Checked the Logs and message says that the AppPool account is unable to connect to the database.
Checked the Content DB in CA and noticed that there are 2 content DBs
Given DB Owner permission on the content DB and retried, got a different error referring to some Microsoft URL.
Checked the Logs in event viewer and found an error :” There is a compatibility range mismatch between the Web server and database”
Checked the Upgrade &Migration from Central Admin
CA --> Upgrade and Migration  Review Database Status  WSS_Content_Intranet1 and the status is: Database is too old and upgrade is required
Hence tried running the Test-SPContentDatabase with no go .It returns an error: “Invalid object name 'Webs' “.
Checked the database in SQL Server and found that there are no tables in the database.
Hence came to a conclusion that the database is corrupted and needs to be restored from the backup.

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