T-SQL使用链接服务器查询结果填充本地表

Question

Hi I am trying to get smart ideas how to accomplish this. I have a table T1 with a column named 'Servers' containing a whole list of linked server names. And I want to query some tables on each of these linked servers and use the result to populate the other columns, named DB_Nmaes for example, of this table.

The ideal resulted table after would be like this

T1

Servers  DB_Names    Datafile_Size, …. 

S1       D1           2M
S1       D2           3M
S1       D3           5M
S2       D1           3M
S2       D2           6M
.
.
.

One way I could think of is to loop through the whole table T1 and construct a dynamic SQL in each loop to query the corresponding linked server and insert to the other fields DB_Names and Datafile_size. But I am trying to avoid doing this because I have many linked servers rows in that column. Is there any way we could accomplish this by using set based operations?

Thanks.

Answer 1

Since you want all databases on the remote servers I would consider changing to a 2 table approach. Your first table will be a table containing all of the linked servers you wish to query. You'd then need to loop through a cursor that would formulate dynamic SQL statements in order to make the call across the linked servers.

Answer 2

I would also suggest to store the result in separate table. Then you can approach it in this way:

CREATE TABLE ServerDbs (LinkedServer VARCHAR(100), DbName VARCHAR(100))

DECLARE @q VARCHAR(MAX)
SET @q = 
    (SELECT 'INSERT INTO ServerDbs SELECT ''' + T.Server + ''', name FROM ' + T.Server + '.master.sys.databases'
    FROM T
    FOR XML PATH(''))

EXEC (@q)