SQL Server 2008 R2 Stuck in Single User Mode

问题

Having executed a DB deploy (from a VS SQL Server database project) on a local database, which failed, the database has been left in a state where it has single user mode left on (the deploy runs as single user mode).

When I connect to it from SSMS and try something like the following:

ALTER DATABASE MyDatabase
SET MULTI_USER;
GO

I get the error:

Changes to the state or options of database 'MyDatabase' cannot be made at this time. The database is in single-user mode, and a user is currently connected to it.

I tried taking the database offline, which SSMS tells me succeeds, but it doesn't appear to actually do anything. So far, I've only been able to get around this by dropping and recreating the database (which is kind of okay, because it's only a local test database). However, I'd like to be able to reset the status.

How can I convince SQL Server to take this database out of single user mode?

回答1:

In first run following query in master database

exec sp_who

If you can't find the culprit, try

SELECT request_session_id FROM sys.dm_tran_locks 
WHERE resource_database_id = DB_ID('YourDatabase')

Then kill all process that use your database with following query:

KILL spid

Then run following query:

USE Master
ALTER DATABASE YourDatabase SET MULTI_USER

回答2:

This was answered here, the code is:

use master
ALTER DATABASE YourDatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE 

--do you stuff here 

ALTER DATABASE YourDatabase SET MULTI_USER

回答3:

Try the below commands

First run these three commands

USE [master] 
SET DEADLOCK_PRIORITY HIGH
exec sp_dboption MyDBName, 'single user', 'FALSE';

Second run these two commands

ALTER DATABASE MyDBName SET MULTI_USER WITH NO_WAIT
ALTER DATABASE MyDBName SET MULTI_USER WITH ROLLBACK IMMEDIATE

回答4:

Use DAC (Dedicated Admin Connection). Make sure you have enabled it first In SSMS type in admin: for Server Name after connecting to master ALTER DATABASE SET MULTI_USER