[MS-SQL] 表格處理-查詢TABLE大小、清除TABLE未使用空間、縮小DataBase檔案

先查詢每個 TABLE 占用的空間大小

SELECT 
    t.NAME AS TableName,
    --s.Name AS SchemaName,
    p.rows AS RowCounts,
    SUM(a.total_pages) * 8 /1024 AS TotalSpaceMB, 
    SUM(a.used_pages) * 8 /1024 AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 /1024 AS UnusedSpaceMB
FROM 
    sys.tables t
INNER JOIN      
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN 
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN 
    sys.allocation_units a ON p.partition_id = a.container_id
LEFT OUTER JOIN 
    sys.schemas s ON t.schema_id = s.schema_id
WHERE 
    t.NAME NOT LIKE 'dt%' 
    AND t.is_ms_shipped = 0
    AND i.OBJECT_ID > 255 
    
    and t.NAME = 'tablename'--只看單一table
GROUP BY 
    t.Name, s.Name, p.Rows
ORDER BY 
    --t.Name
 SUM(a.total_pages) DESC

清空 TABLE

TRUNCATE TABLE tablename

修改DataBase的復原模式為簡單

ALTER DATABASE DataBaseName
SET RECOVERY SIMPLE
--SET RECOVERY FULL;
GO

縮小DataBase實體檔案，清出未使用空間

USE DataBaseName;
DBCC SHRINKFILE (DataBaseName, 7);
GO
DBCC SHRINKFILE (DataBaseName_log, 7);
GO

修改DataBase邏輯名稱 – 備份還原時使用

Alter DataBASE DB_NAME
MODIFY FILE(NAME= 'DataBaseName' ,NEWNAME= 'DataBaseName_BackUp' )
Alter DataBASE DB_NAME
MODIFY FILE(NAME= 'DataBaseName_log', NEWNAME= 'DataBaseName_BackUp_log' )