Question

我计划迁移并尝试获取行数从一台服务器迁移到另一台服务器的行数。我已经写了一个动态查询来保持超时，我不确定从服务器上的所有数据库获取行数的最佳方法，因为我们有超过500个数据库。我附上了我迄今为止写过的代码。

DECLARE @sql NVARCHAR(MAX);
DECLARE @ix INT = 1;

DECLARE @temptbl TABLE (
dbname VARCHAR(500),
cnt INT
 )

 DECLARE @dbs TABLE (
dbname NVARCHAR(500)
 )
 SET @sql = CAST(N'' AS NVARCHAR(MAX));
 INSERT INTO @dbs
    SELECT
        Org_dbname
    FROM [ourdatabases].dbo.tbl_datbases om
    INNER JOIN sys.databases S
        ON om.Org_dbname = S.name
    WHERE Org_dbname IS NOT NULL

 ;


 DECLARE @dbname VARCHAR(255)

 WHILE EXISTS (SELECT
    *
FROM @dbs)
 BEGIN
 SELECT TOP 1
@dbname = dbname
 FROM @dbs

 PRINT @dbname
 SELECT
@sql = @sql + N' 

use ' + QUOTENAME(@dbname) + ';

      SELECT

SUM(q1.[RowCount]) cnt
 FROM (SELECT
        QUOTENAME(SCHEMA_NAME(sOBJ.schema_id)) + ''.'' +               QUOTENAME(sOBJ.name) AS [TableName]
    ,SUM(sdmvPTNS.row_count) AS [RowCount]
FROM sys.objects AS sOBJ
INNER JOIN sys.dm_db_partition_stats AS sdmvPTNS
    ON sOBJ.object_id = sdmvPTNS.object_id
WHERE sOBJ.type = ''U''
AND sOBJ.is_ms_shipped = 0x0
AND sdmvPTNS.index_id < 2
GROUP BY    sOBJ.schema_id
        ,sOBJ.name) q1

      '

 DELETE FROM @dbs
 WHERE dbname = @dbname

 END

 SET @sql = STUFF(@sql, 1, 10, '');
 PRINT @sql

 INSERT INTO @temptbl

 EXEC sp_executesql @sql

 SELECT
     SUM(cnt)
 FROM @temptbl

Answer 1

你真的不需要游标，表变量或任何循环。我们可以利用动态sql在所有数据库中生成全面的查询。以下是如何在您的实例上跨每个数据库执行此查询（除少数例外）。

declare @SQL nvarchar(max) = N'';

select @SQL = @SQL + 
    N'SELECT DatabaseName = ''' + QUOTENAME(d.name) + N'''      
        ,SUM(sdmvPTNS.row_count) AS [RowCount]
    FROM ' + QUOTENAME(d.name) + N'.sys.objects AS sOBJ
    INNER JOIN ' + QUOTENAME(d.name) + N'.sys.dm_db_partition_stats AS sdmvPTNS
        ON sOBJ.object_id = sdmvPTNS.object_id
    WHERE sOBJ.type = ''U''
    AND sOBJ.is_ms_shipped = 0x0
    AND sdmvPTNS.index_id < 2 UNION ALL '
from sys.databases d
where name not in ('master', 'tempdb', 'model', 'msdb')

set @SQL = left(@SQL, len(@SQL) - 10) --Need to remove the last UNION ALL

--select @SQL
exec sp_executesql @SQL

所有SQL Server数据库的行数

1 个答案: