从过去 6 个月的所有数据库中获取所有表的大小

Question

I'm trying to get size of all tables and size should be shown from last 6 months data below is the query which I'm using to get the results.

Note: Below query shows size of all tables since they got created

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

Below is the query which I customized and tried to get results from the last 6 months but it gives size of all tables since they got created. If someone can suggest me how I can modify it in a way it only shows UsedSpaceMB from last 6 months

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

The DATEADD() function returns a date time (smalldatetime). Its syntax is,

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

sample query in you case:

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

I applied above query on sys.objects to filter objects with modified date is less than last 6 months It will return all the objects where modified date is from last 6 months even the create_date is greater. before applying filter there was 182 records after filtering it reduced to 92.

I customized and tried to get results from the last 6 months but it gives size of all tables since they got created.

if you want tables only created in last 6 month then you have to apply filter on create_date .