4 Key Performance Benefits of Enabling Query Store

Query Store has been around since SQL Server 2016, but its full potential often goes untapped. Some companies were initially wary of it after some edge case problems arose during its initial rollout. However, since its initial release, Query Store has undergone numerous enhancements and is rapidly establishing itself as one of the most significant advancements in SQL Server, comparable to the SQL Server DMVs introduced in SQL Server 2005.

What are the benefits of enabling Query Store? While there are many technical reasons, here are my top four broad advantages to consider.

1. Free SQL Server monitoring

Your business has already paid for Query Store in the SQL Server licensing. With SQL Server 2016 and later, it is accessible at the database level. This means that for smaller shops that may not have a large enterprise environment, you don’t have to spend large sums of money to get observability from 3rd party software. Query Store’s native capture mechanisms can provide significant insight into your SQL Server’s performance, all without costing you any more money!

2. Capture foundational SQL Server performance indicators

Query Store collects the data already present in your SQL Server, displaying it in easy-to-understand graphs and reports. With Query Store, values for CPU, memory, duration, and more can be viewed based on MAX/AVG/STD Deviation metrics per query. This provides valuable insights into core metrics that shape the performance of your applications. Furthermore, this data allows your company to see not only how specific queries behaved when there was a performance problem but also to trend those queries over time to see shifts in performance.

SQL Server wait statistics are also captured and displayed in Query Store. When a query needs a resource, like CPU, or data read from disk, then a wait type is assigned to the query. These various waits affect query performance in a multitude of ways, and Query Store surfaces those performance-impacting waits for you. For example, the Query Wait Statistics report may show large bar graphs for BUFFER IO and CPU. Queries appearing in both graphs may be suffering from large table scans because of missing indexes.

Additionally, Query Store captures the query plans associated with queries. Think of query plans as the blueprint for how the query will be executed. These plans contain data about the decisions SQL Server is making about your data and how to process it. Some decisions revealed in the query plan can pinpoint performance issues. For example, query plans that regularly contain table scan operators may indicate missing indexes that force SQL Server to scan millions of rows when it only needs to retrieve a few thousand rows.

3. Talk to your vendors with data in hand

COTS vendors need to see hard data when approached with a performance problem. Query Store can provide that data. Without it, you can report a problem, but the software vendor is unlikely to consider making changes.

If you engage a DBA as a Service company, having performance data in hand will go a long way toward building a good relationship with that vendor. They will see your preparedness and be drawn to that. Also, it will allow them to solve your problem faster, and isn’t that what you really want anyway?

4. Allow your applications to take advantage of new performance features

Newer versions of SQL Server have a collection of features known as Intelligent Query Processing (IQP). Features such as memory grant feedback, degree of parallelism feedback, and more are tied into IQP. These features depend on Query Store. Without Query Store running and without using the appropriate database compatibility level, your applications are missing out on performance-enhancing features that make queries execute faster, use fewer resources, or do both at the same time.

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