SQL SERVER - 查詢 TABLE 大小、清除 TABLE 未使用空間，縮小 DB 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 
GROUP BY 
    t.Name, s.Name, p.Rows
ORDER BY 
    --t.Name
SUM(a.total_pages) DESC

清空 TABLE

TRUNCATE TABLE XXX_TABLE

修改 DB 的復原模式為簡單

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

縮小 DB 實體檔案，清出未使用空間

USE XXX_DB;
DBCC SHRINKFILE (XXX_DB, 7);
GO
DBCC SHRINKFILE (XXX_DB_log, 7);
GO

修改 DB 邏輯名稱 - 備份還原時使用

Alter DataBASE DB_NAME

MODIFY FILE(NAME= 'DB_NAME' ,NEWNAME= 'DB_NAME-BACKUP' )

Alter DataBASE DB_NAME

MODIFY FILE(NAME= 'DB_NAME_log', NEWNAME= 'DB_NAME-BACKUP_log' )

參考：
[MS SQL]查詢資料庫中每個資料表之列數與資料表大小(容量)資訊。Get size of all tables in database