ALTER DATABASE failed because a lock could not be placed on database

Question

I need to restart a database because some processes are not working. My plan is to take it offline and back online again.

I am trying to do this in Sql Server Manage

Answer 1

I managed to reproduce this error by doing the following.

Connection 1 (leave running for a couple of minutes)

CREATE DATABASE TESTING123
GO

USE TESTING123;

SELECT NEWID() AS X INTO FOO
FROM sys.objects s1,sys.objects s2,sys.objects s3,sys.objects s4 ,sys.objects s5 ,sys.objects s6

Connections 2 and 3

set lock_timeout 5;

ALTER DATABASE TESTING123 SET SINGLE_USER WITH ROLLBACK IMMEDIATE;