Query Store Isn’t A Forensics Engine

Grant Fritchey shows that Query Store has a limited capability of finding “ill-behaving” queries at a point in time:

Here’s a great question I received: We had a problem at 9:02 AM this morning, but we’re not sure what happened. Can Query Store tell us?

My first blush response is, no. Not really. Query Store keeps aggregate performance metrics about the queries on the database where Query Store is enabled. Aggregation means that we can’t tell you what happened with an individual call at 9:02 AM…

Well, not entirely true.

Query Store isn’t a total solution for “Why was the system slow at XX:XX?” types of questions.  This does not diminish its value as long as you do not try to treat it as your only monitoring solution.

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Monitoring Query Store Space usage

Erin Stellato has a process which alerts her when query store space utilization reaches a defined threshold: For those of you not familiar with the Query Store settings, please check out my post which lists each one, the defaults, and what I would recommend for values and why.  When discussing MAX_STORAGE_SIZE_MB, I mention monitoring via sys.database_query_store_options or […]

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Trying To Force A Plan For A Different Query With Query Store

Erin Stellato shows us that you cannot use a plan generated for one query as a forced plan for a different query in Query Store: This is question I’ve gotten a few times in class…Can you force a plan for a different query with Query Store? tl;dr No. Assume you have two similar queries, but […]

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