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Parameter Sensitivity Plan Optimization and Monitoring Scripts

Erik Darling gives us a warning:

You can read the full documentation here. But you don’t read the documentation, and the docs are missing some details at the moment anyway.

– It only works on equality predicates right now

– It only works on one predicate per query

– It only gives you three query plan choices, based on stats buckets

There’s also some additional notes in the docs that I’m going to reproduce here, because this is where you’re gonna get tripped up, if your scripts associate statements in the case with calling stored procedures, or using object identifiers from Query Store.

It’s not a deal-breaker but it does make things a lot harder for tool writers, as Erik points out. Hopefully there’s some way to tie this all together before GA.