Comments on: Why isn’t my filtered index being used?

By: Not Entirely Parameterized Dynamic SQL | Erik Darling Data

Not Entirely Parameterized Dynamic SQL | Erik Darling Data — Tue, 07 Jul 2020 23:06:39 +0000

[…] Since we don’t, we can can use a trick that works on filtered indexes. […]

By: Not Entirely Parameterized Dynamic SQL – Erik Darling Data

Not Entirely Parameterized Dynamic SQL – Erik Darling Data — Wed, 30 Jan 2019 14:29:27 +0000

[…] Since we don’t, we can can use a trick that works on filtered indexes. […]

By: Rob Farley

Rob Farley — Tue, 21 Jun 2016 13:29:47 +0000

Oh Matt – I’m totally in favour of using views to help developers make good decisions about predicates they should use. 🙂

By: Matt

Matt — Tue, 21 Jun 2016 13:24:33 +0000

Nice article, this is quite subtle but very useful knowledge that needs to be thought about.
If filtered indexes are susceptible to this problem then is it a good alternative idea to embed the filter clause in a view, index the view and then query on the view? Clearly the developer has to know how to make this work safely but this may well satisfy a lot of situations where the filtered index might be applied.

By: Rob Farley

Rob Farley — Wed, 25 Feb 2015 02:03:53 +0000

Hi Marcel,
Yes (as per my post that I linked to above), but if you use parameters (with OPTION (RECOMPILE)) then the QO needs to come up with a plan that is general and is unlikely to use your filtered index.

By: Marcel

Marcel — Wed, 25 Feb 2015 01:47:07 +0000

You can use parametrized dynamic SQL alternatively which is immune to injection.

By: Alvin Park

Alvin Park — Mon, 23 Feb 2015 12:53:46 +0000

Well how can I register myselg on this site??