USE [master]
GO
ALTER DATABASE DBNAME SET RECOVERY SIMPLE WITH NO_WAIT
GO
ALTER DATABASE DBNAME SET RECOVERY SIMPLE   -- 设置简单模式
GO
USE DBNAME
GO
DBCC SHRINKFILE (N'DBNAME_log' , 2, TRUNCATEONLY)  -- 设置压缩后的日志大小为 2M
GO
USE [master]
GO
ALTER DATABASE DBNAME SET RECOVERY FULL WITH NO_WAIT
GO
ALTER DATABASE DBNAME SET RECOVERY FULL  -- 还原为完全模式
GO

-- 修改 DBNAME 为要清理的数据库名

# help
https://www.cnblogs.com/IIXS/p/11710759.html