Deleting User Objects in Master Database

This script erases everything in the master database that is not Microsoft-shipped. Be careful: some user objects belong in the master database (database triggers, security objects, for example). Backing up the master database first would be a prudent step.

-- Drops all user objects that have been accidentally created in the master database.
USE master

DECLARE @sName     sysname
DECLARE @sTypeDesc NVARCHAR(1024)
DECLARE @sType     NVARCHAR(1024)
DECLARE @nScore    INT
DECLARE @sSql      NVARCHAR(1024)

DECLARE TheCursor CURSOR FOR
 SELECT name, type_desc
   FROM sys.objects
  WHERE is_ms_shipped = 0

OPEN TheCursor

FETCH NEXT FROM TheCursor
 INTO @sName, @sTypeDesc

WHILE @@FETCH_STATUS = 0
BEGIN
 SET @sType  = REVERSE(@sTypeDesc)
 SET @nScore = CHARINDEX('_', @sType)
 SET @sType  = SUBSTRING(@sType, 0, @nScore)
 SET @sType  = REVERSE(@sType)

 SET @sSql = 'DROP ' + @sType + ' ' + @sName
 RAISERROR('%s', 10, 1, @sSql) WITH NOWAIT 
 EXEC sp_sqlexec @sSql
 
 FETCH NEXT FROM TheCursor
  INTO @sName, @sTypeDesc
END

CLOSE TheCursor
DEALLOCATE TheCursor

PRINT 'Done.'