從過去 6 個月的所有數據庫中獲取所有表的大小

Question

我正在嘗試獲取所有表的大小，並且應該從最近 6 個月的數據中顯示大小，下面是我用來獲取結果的查詢。

注意：下面的查詢顯示了所有表自創建以來的大小

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

下面是我自定義的查詢，並試圖從過去 6 個月中獲取結果，但它給出了自創建以來所有表的大小。 如果有人可以建議我如何以僅顯示過去 6 個月的 UsedSpaceMB 的方式修改它

SELECT 
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows,
    CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
    CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB,
    CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) AS UnusedSpaceMB,
    t.modify_date AS ModifyDate
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.modify_date >= Dateadd(Month, Datediff(Month, 0, DATEADD(m, -6, current_timestamp)), 0)
    AND t.NAME NOT LIKE 'dt%' 
    AND t.is_ms_shipped = 0
    AND i.OBJECT_ID > 255 
GROUP BY 
    t.Name, s.Name, p.Rows, t.modify_date
ORDER BY 
    TotalSpaceMB DESC, t.Name, t.modify_date;

Answer 1

DATEADD() function 返回日期時間 (smalldatetime)。 它的語法是，

DATEDADD(interval, increment (int), expression (date))

您的示例查詢：

t.modify_date >= DATEADD(MONTH, -6, GETDATE())

我在sys.objects上應用了上面的查詢來過濾修改日期小於過去 6 個月的對象它將返回修改日期從過去 6 個月開始的所有對象，即使create_date更大。 在應用過濾器之前有 182 條記錄，過濾后減少到 92 條。

我自定義並嘗試獲取過去 6 個月的結果，但它給出了自創建以來所有表的大小。

如果您只想在過去 6 個月內創建表，則必須在create_date上應用過濾器。