ODBC Query Works in MS Access But Times-Out in SQL Server

Question

We have a pass-through query in MS Access that we need to convert to SQL Server.

The query in MS Access is using a 32-bit ODBC DSN to connect to a Redshift database. The query is complex (eg has about 20 sub-queries), but runs fine in MS Access within 1 to 2 minutes.

We converted that query to SQL Server and use a Linked Server connection using a 64-bit ODBC DSN with the MSDASQL provider to connect to that same database. The query in SQL Server will try to run for over 30 minutes but then eventually times-out.

Any idea why it would work in MS Access and not SQL Server?

I thought it might related to using 64-bit vs 32-bit, so I tried adding a 32-bit ODBC as a Linked Server, but SQL Server would not allow me to.

Answer 1

Given the feedback I decided to scrap using Linked Sever and used SSIS instead to pull in the data. Thanks everyone for your time and help.