clipped from: msdn2.microsoft.com   
Troubleshooting (SQL Server 2000)

Error 911


Severity Level 16

Message Text

Could not locate entry in sysdatabases for database '%.*ls'. No entry found with that name. Make sure that the name is entered correctly.

This error occurs when attempting to change database context (with a USE statement) to a database that does not exist, or when the default database established for a login does not exist. In the latter case, the user login then attempts to access the master database.