WordPress site redirects to installation page

Symptoms

• Site based on WordPress redirects to WordPress installation page https://example.com/wp-admin/install.php
• Domains > example.com > Databases shows 0 KB size for WordPress database.
  

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  WordPress base tables are missing from the database.

Cause

Corrupted WordPress database.

Resolution

1. Login to the Plesk.
2. Restore/Import valid WordPress database at  Domains > example.com > Databases > Import
   
   Another way is to restore Database from available backup.