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Editorial Team
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Asked: 2026-05-19T05:56:07+00:00

I have a sql script running on a server (ServerA) This server, has a

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I have a sql script running on a server (ServerA)
This server, has a linked server set up (ServerB) – this is located off site in a datacenter.

This query works relatively speeidily:

SELECT OrderID
FROM [ServerB].[DBName].[dbo].[MyTable]
WHERE Transferred = 0

However, when updating the same table using this query:

UPDATE [ServerB].[DBName].[dbo].[MyTable]
SET Transferred = 1

It takes > 1 minute to complete (even if there’s only 1 column where Transferred = 0)

Is there any reason this would be acting so slowly?
Should I have an index on MyTable for the “Transferred” column?

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1 Answer

  1. Editorial Team

    If you (I mean SQL server) cannot use index on remote side to select records, such remote update in fact reads all records (primary key and other needed fields) from remote side, updates these locally and sends updated records back. If your link is slow (say 10Mbit/s or less), then this scenario takes lot of time.

    I’ve used stored procedure on remote side – this way you should only call that procedure remotely (with set of optional parameters). If your updateable subset is small, then proper indexes may help too – but stored procedure is usually faster.

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