获取表格列表的总大小

Question

我有一个非常大的prod数据库。我需要复制这个数据库来创建一个测试环境，但是没有足够的磁盘空间。

但实际上不需要从包含用户数据的表中复制行，只有那些描述功能的表是必需的。对于包含用户数据的表，我只需要复制表“description”（列，索引，触发器...）。

如何（使用什么查询）我可以估计没有来自某些表的数据的数据库的大小？

Answer 1

SET NOCOUNT ON 

DBCC UPDATEUSAGE(0) 

-- DB size. 
EXEC sp_spaceused 

-- Table row counts and sizes. 
CREATE TABLE #t 
( 
    [name] NVARCHAR(128), 
    [rows] CHAR(11), 
    reserved VARCHAR(18), 
    data VARCHAR(18), 
    index_size VARCHAR(18), 
    unused VARCHAR(18) 
) 

INSERT #t EXEC sp_msForEachTable 'EXEC sp_spaceused ''?''' 

SELECT * 
FROM #t 

-- # of rows. 
SELECT SUM(CAST([rows] AS int)) AS [rows] 
FROM #t 

DROP TABLE #t 

* 由亚历山大·格罗斯*整洁 Link to source

Answer 2

SELECT 
    schema_qualified_table = s.name + '.' + t.name, 
    KB = SUM(ps.reserved_page_count) * 8192/1024.0 
    FROM sys.tables AS t 
    INNER JOIN sys.schemas AS s ON t.[schema_id] = s.[schema_id] 
    INNER JOIN sys.dm_db_partition_stats AS ps 
    ON t.[object_id] = ps.[object_id] 
    WHERE s.name + '.' + t.name IN (N'dbo.table1', N'dbo.table2', ...) 
    -- list of tables you do care about ^^^^^^^^^^  ^^^^^^^^^^ 
    GROUP BY s.name + '.' + t.name; 

一点可能是：

;WITH x AS 
(
    SELECT o = t.[object_id], n = s.name + '.' + t.name 
    FROM sys.tables AS t 
    INNER JOIN sys.schemas AS s 
    ON t.[schema_id] = s.[schema_id] 
) 
SELECT 
    schema_qualified_table = x.n, 
    KB = SUM(ps.reserved_page_count) * 8192/1024.0 
    FROM x INNER JOIN sys.dm_db_partition_stats AS ps 
    ON x.o = ps.[object_id] 
    WHERE x.n IN (N'dbo.table1', N'dbo.table2', ...); 

Answer 3

发布我的扩展阿龙贝特朗的回答，只是可读性。唯一的区别是将连接添加到SCHEMAS表中，并在输出和组合by中包括模式名称。

SELECT 
    s.name, 
    t.name, 
    KB = SUM(ps.reserved_page_count) * 8192/1024.0 
    FROM sys.tables AS t 
    INNER JOIN sys.dm_db_partition_stats AS ps 
    ON t.[object_id] = ps.[object_id] 
    INNER JOIN sys.schemas S 
    ON t.schema_id = s.schema_id 
    WHERE t.name IN (<YOUR TABLES GO HERE) -- list of tables you do care about 
    GROUP BY t.name, 
    s.name; 

正如Aaron正确指出的，试图过滤表和模式的组合可能会变得非常快。你可以很容易地结束了手术室的一个巨大的集合：

(S.SCHEMA = 'SCHEMA1' and T.NAME = 'FOO') 
OR 
(S.SCHEMA = 'SCHEMA2' and T.NAME = 'FOO') 
OR 
(S.SCHEMA = 'SCHEMA1' and T.name = 'BAR') 
...