Question

我有一个非常大的prod数据库。我需要复制此数据库以创建测试环境，但磁盘空间不足。

但实际上不需要从包含用户数据的表中复制行，只需要那些描述功能的表。对于具有用户数据的表，我只需要复制表“description”（列，索引，触发器......）。

如果没有来自某些表的数据，我如何（使用什么查询）估算数据库的大小？

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

AlexanderGroß*

* 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;

有点整洁可能是：

;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

将我的扩展发布到Aaron Bertrand的答案，只是为了便于阅读。唯一的区别是将连接添加到SCHEMAS表，并在输出和组中包含模式名称。

  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正确地指出的那样，尝试过滤表格和模式的组合可能会非常快速地变得难看。你很容易得到大量的OR：

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

获取表列表的总大小

3 个答案: