To Kill SQL Server Connections for a database

Disclaimer: Snagged & Sharing

1. Manual way:

Get all processes attached to the database
SELECT spid FROM master..sysprocesses WHERE dbid = DB_ID(@DatabaseName)
and AND spid != @@SPID

Note : @@SPID is your connected instance Service Process id "SPID"

and Perform Kill operation
EXEC('KILL '+RTRIM(@spid) )

2. Create Script

Use Master
Go

Declare @dbname sysname

Set @dbname = 'name of database you want to drop connections from'

Declare @spid int
Select @spid = min(spid) from master.dbo.sysprocesses
where dbid = db_id(@dbname)
While @spid Is Not Null
Begin
Execute ('Kill ' + @spid)
Select @spid = min(spid) from master.dbo.sysprocesses
where dbid = db_id(@dbname) and spid > @spid
End

3. Use Stored procedure

CREATE PROCEDURE dbo.clearDBUsers
@dbName SYSNAME
AS
BEGIN
SET NOCOUNT ON

DECLARE @spid INT,
@cnt INT,
@sql VARCHAR(255)

SELECT @spid = MIN(spid), @cnt = COUNT(*)
FROM master..sysprocesses
WHERE dbid = DB_ID(@dbname)
AND spid != @@SPID

PRINT 'Starting to KILL '+RTRIM(@cnt)+' processes.'

WHILE @spid IS NOT NULL
BEGIN
PRINT 'About to KILL '+RTRIM(@spid)
SET @sql = 'KILL '+RTRIM(@spid)
EXEC(@sql)
SELECT @spid = MIN(spid), @cnt = COUNT(*)
FROM master..sysprocesses
WHERE dbid = DB_ID(@dbname)
AND spid != @@SPID
PRINT RTRIM(@cnt)+' processes remain.'
END
END
GO