March 17, 2022 at 9:23 pm
Does DTC estimate cardinality when Joining tables from 2 different servers so that the work is evenly distributed to those 2 servers based on cardinality?
We're using SSMS 2016.
The goal is to optimize transactions between the OLTP server and source servers. The source servers have indexes applied that I want to leverage during processing for JOINS and WHERE clauses.
March 18, 2022 at 8:05 am
DTC just coördinaties the transactions!
Stay away of linked servers as much as you can!
Chances are the sql instance that runs your sql statement ( join with linked server involved ) doesn't run it efficiently at the remote server !
( e.g. by pulling over the full set of data to its local temdb and only then processing the join )
Johan
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