清除SQL DB Transaction Log

手上個9G的資料庫, LOG卻有45G
搜尋了一下做法, 用以下方式即可
1. Backup DB (也可不要)
2. Detach DB
3. Rename Log file
4. Attach DB (注意不要attach log)
New log file will be recreated
5. Delete Renamed Log file(視需要)