--日志文件收缩至多少M
    DECLARE @DBLogSise AS INT
    SET @DBLogSise=0
    --查询出数据库对应的日志文件名称
    DECLARE @strDBName AS NVARCHAR(500)
    DECLARE @strLogName AS NVARCHAR(500)
    DECLARE @strSQL AS VARCHAR(1000)
    
    SELECT 
        @strLogName=B.name,
        @strDBName=A.name
    FROM master.sys.databases AS A
    INNER JOIN sys.master_files AS B
    ON A.database_id = B.database_id
    WHERE A.database_id=DB_ID() 
        
    SET @strSQL=‘
    --设置数据库恢复模式为简单
    ALTER DATABASE [‘+@strDBName+‘] SET RECOVERY SIMPLE;
    --收缩日志文件
    DBCC SHRINKFILE (‘‘‘+@strLogName+‘‘‘ , ‘+CONVERT(VARCHAR(20),@DBLogSise)+‘);
    --恢复数据库还原模式为完整
    ALTER DATABASE [‘+@strDBName+‘] SET RECOVERY FULL ‘
    exec(@strSQL)