How to "change connection" in block of T-SQL; like I do using ssmse interface when I select "Available Databases" after getting other instances?

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Of great importance is the added fact that these instances are linked as servers and they show the proper property as such in "Linked Servers" where each's catalog can be viewed.

The problem for me is that I can't specifically write a statement like this:

SQL

SELECT * FROM [COMPUTER_A\INSTANCE_01].[knowndatabase].[dbo].[knowntable]

Given the fact that INSTANCE_01 is not currently under the "USE" control within the executing interface of ssmse. Nor can I do the general sys.all_objects type of query in a loop using that same [COMPUTER_A\INSTANCE_01].sys.all_objects "expectation".

Is this question clear enough?

[EDIT]

An idea:

SQL

DECLARE @nullscript varchar(4000)
SET @nullscript = 'sqlcmd -S COMPUTER_A\INSTANCE_01 '
EXEC xp_cmdshell @nullscript

(to view what databases are now available):

SQL

SELECT * FROM sys.master_files WHERE data_space_id = 1

(And unfortunately unfruitful next to test):

SQL

DECLARE @nullscript2 varchar(4000)
SET @nullscript2 = 'sqlcmd -S COMPUTER_A\INSTANCE_02 '
EXEC xp_cmdshell @nullscript2

(Get the INSTANCE_01 tables .. drat):

SQL

SELECT * FROM sys.master_files WHERE data_space_id = 1

No change of the INSTANCE from _01 to _02

[END EDIT]

Posted 25-Oct-12 9:40am

RedDk

Updated 26-Oct-12 9:47am

v4

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RedDk · Accepted Answer · 2012-10-26T09:23:00

The solution:

There is no solution only a workaround. SSMSE will not allow another instance to be addressed after initializing a particular server, outside of committing to the use of the interface button via mouse.

A workaround to circumvent ssmse interface altogether is of the form, after sp_addLinkedServer is deployed,

EXECUTE xp_cmdshell 'sqlcmd -S COMPUTER_A\INSTANCE_01 -q " ... "'

And

EXECUTE xp_cmdshell 'sqlcmd -S COMPUTER_A\INSTANCE_02 -q " ... "'

To do the dirty work.

There is to be expected from this xp_cmdshell/sqlcmd lever only text output (or other hbn considering the ssmse options available) but very tough operations where tables are mirrored or complex operations during maintenance or upgrade are created or refreshed should perform as expected.