SQL Server移除事务日志后sys.master_files依然存在记录问题

DECLARE @db_name NVARCHAR(32);

SET @db_name=N‘TEST‘;

SELECT   f.database_id                AS database_id  

        ,DB_NAME(f.database_id)       AS database_name

        ,f.file_id                    AS primary_log_id 

        ,f.name                       AS log_logical_name

        ,f.physical_name              AS database_file_name

        ,f.type_desc                  AS type_desc

        ,CAST(f.size * 8.0 / 1024 / 1024 AS DECIMAL(8, 4)) 

                                      AS [Size(GB)]  

        ,CASE WHEN max_size = 0  THEN N‘不允许增长‘

                  WHEN max_size = -1 THEN N‘自动增长‘

              ELSE LTRIM(STR(max_size * 8.0 / 1024 / 1024, 14, 2))

                      + ‘G‘

         END                          AS max_size 

        ,CASE WHEN is_percent_growth = 1

                 THEN RTRIM(CAST(Growth AS CHAR(10))) + ‘%‘

                 ELSE RTRIM(CAST(Growth*8.0/1024 AS CHAR(10))) + ‘M‘

         END                          AS growth_size 

        ,Is_Percent_Growth            AS IsPercentGrowth 

        ,f.state_desc

FROM    sys.master_files  f

WHERE  f.database_id= DB_ID(@db_name) 

  AND  type = 1

--Step 1:    首先找出有2个或多个事务日志的数据库

USE master;

GO

SELECT  f.database_id         AS database_id  ,

        d.name                AS database_name,

        f.type_desc           AS type_desc    ,

        COUNT(*)              AS log_count

FROM    sys.master_files  f

INNER  JOIN sys.databases d ON f.database_id = d.database_id

WHERE   type = 1

GROUP BY f.database_id ,

         f.type_desc,

         d.name

HAVING  COUNT(*) >= 2;

--Step 2:    查看事务日志文件的详细信息(包括文件逻辑名，物理路径，大小，增长情况等等)

DECLARE @db_name NVARCHAR(32);

SET @db_name=N‘TEST‘;

SELECT   f.database_id                AS database_id  

        ,DB_NAME(f.database_id)       AS database_name

        ,f.file_id                    AS primary_log_id 

        ,f.name                       AS log_logical_name

        ,f.physical_name              AS database_file_name

        ,f.type_desc                  AS type_desc

        ,CAST(f.size * 8.0 / 1024 / 1024 AS DECIMAL(8, 4)) 

                                      AS [Size(GB)]  

        ,CASE WHEN max_size = 0  THEN N‘不允许增长‘

                  WHEN max_size = -1 THEN N‘自动增长‘

              ELSE LTRIM(STR(max_size * 8.0 / 1024 / 1024, 14, 2))

                      + ‘G‘

         END                          AS max_size 

        ,CASE WHEN is_percent_growth = 1

                 THEN RTRIM(CAST(Growth AS CHAR(10))) + ‘%‘

                 ELSE RTRIM(CAST(Growth*8.0/1024 AS CHAR(10))) + ‘M‘

         END                          AS growth_size 

        ,Is_Percent_Growth            AS IsPercentGrowth 

        ,f.state_desc

FROM    sys.master_files  f

WHERE  f.database_id= DB_ID(@db_name) 

  AND  type = 1

--Step 3: 确认那个是主事务日志文件,因为主日志文件（primary log）是不能删除的

DECLARE @db_name NVARCHAR(32);

SET @db_name=N‘TEST‘;

SELECT  f.database_id            AS database_id  ,

        DB_NAME(f.database_id)   AS database_name,

        MIN(f.file_id)           AS primary_log_id ,

        f.type_desc              AS type_desc    

FROM    sys.master_files  f

WHERE  f.database_id= DB_ID(@db_name) 

  AND  type = 1

GROUP BY f.database_id,f.type_desc;

--Step 4：查看对应数据库的事务日志状态

DECLARE @db_name NVARCHAR(32);

SET @db_name=N‘TEST‘;

SELECT  name ,

        log_reuse_wait_desc

FROM    sys.databases

WHERE name=@db_name

--Step 5: DBCC SQLPERF(LOGSPACE)

--查看数据库的事务日志空间使用情况统计信息

DBCC SQLPERF(LOGSPACE)

 --Step 6： 查看虚拟日志情况(虚拟日志文件 (VLF)事务日志的信息)

USE TEST;

GO

DBCC LOGINFO(‘TEST‘)

GO

USE TEST;

GO

DBCC SHRINKFILE(‘TEST_Log1‘, 1)

USE TEST;

GO

DBCC SHRINKFILE(‘TEST_Log1‘, EMPTYFILE)

--Step 7: 备份事务日志

--类似这样的脚本。

BACKUP LOG TEST TO DISK = ‘M:\DB_BACKUP\Test.Trn‘

GO

--有些情况下,Step 6 跟 Step 7要循环交叉进行，直到事务日志文件empty后，然后执行step 8

--Step 8: 移除事务日志文件

ALTER DATABASE TEST REMOVE FILE TEST_Log1