Setting database option SINGLE_USER to ON for database

You can find more details on following post

http://support.microsoft.com/kb/911847
http://support.microsoft.com/kb/259551
http://support.microsoft.com/kb/247181/EN-US/
http://support.microsoft.com/kb/274799/

Backing Up and Restoring Your MySQL Database

You can find more details on following links

http://www.devshed.com/c/a/MySQL/Backing-up-and-restoring-your-MySQL-Database/1/
http://www.mysqlperformanceblog.com/2006/07/30/mysql-crash-recovery/
http://dev.mysql.com/tech-resources/articles/recovering-from-crashes.html.
http://bytes.com/topic/mysql/answers/631163-how-change-mysql-database-directory

Login failed for user 'sa'. [CLIENT: ]

You can find more details on following post

http://support.microsoft.com/kb/322336
http://blogs.msdn.com/sql_protocols/archive/2006/02/21/536201.aspx
http://www.eggheadcafe.com/forumarchives/SQLServersecurity/Jul2005/post23406881.asp
http://social.msdn.microsoft.com/forums/en-US/sqldataaccess/thread/a50f79ab-a877-4e50-a5bc-8bd0f88384a2/
http://www.tek-tips.com/viewthread.cfm?qid=1344607&page=11
http://support.microsoft.com/kb/907284

How to: Change Server Authentication Mode

You can find more information on MSDN
http://msdn.microsoft.com/en-us/library/ms188670.aspx