153. CloudSQL MSSQL減少資料庫大小

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睡睡念

也不知道我怎麼也兼DBA了，有種MIS的感覺，啥都管。
如果資料量太多，刪除資料後，是不會把空間釋放的，
需要對資料庫做壓縮，容量才會還出來。

正文

順便說一下查容量的步驟

  1. 查資料庫的容量
SELECT DB_NAME(database_id) N'資料庫', physical_name N'實體檔案', type_desc N'檔案類型', state_desc N'檔案狀態', size*8.0/1024 N'檔案大小(MB)'
FROM sys.master_files
  1. 查詢資料表大小
SELECT 
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows,
    SUM(a.total_pages) * 8 AS TotalSpaceKB, 
    CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
    SUM(a.used_pages) * 8 AS UsedSpaceKB, 
    CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB, 
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB,
    CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) 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 
    TotalSpaceMB DESC, t.Name
  1. 刪除完後，可以先做交易記錄檔壓縮
ALTER DATABASE DB_name SET RECOVERY simple
use DB_name
go
dbcc shrinkfile('DB_name_log',2)

ALTER DATABASE table_name SET RECOVERY FULL
  1. 壓縮DB，將空間釋放，可以用指令，也可以直接用SSMS操作
    指令，可以跟step 3 一起動作
1.  DBCC SHRINKDATABASE(N'DB_name' )

或是直接照圖操作
153-fig.1.jpg
153-fig.2.jpg

ref.