We are researching the performance difference between SSIS Lookup and T-SQL Join. We want to join two tables; tables are in the same SQL server instance, different databases.
I suspect for small table joins, the difference is minimal or negligible. In this case, our team prefers T-SQL, easier to code/script than writing diagrams. Additionally in the DevOps perspective, we can compile/build scripts in a DB project; unfortunately, SSIS will not compile T-SQL correctly, I can write 'testabcd' in an SSIS Execute SQL statement, and the project will still build/compile.
However, for a large number of rows which will take longer processing, what is quicker? T-SQL which has indexes and statistics, or SSIS which is conducted all in memory?
I read these articles with different viewpoints, the team is trying to gain consensus.
Let's assume, T-SQL Engine and SSIS are provided same hardware: CPU and Memory. Given the same specs, I would like to know performance speed on an internal algorithm perspective.