How To Run A Query In Sql Server Management Studio

How To Run A Query In Sql Server Management Studio – Imagine a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be amazing? Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quargus or Play Framework. So spend a Saturday night doing things you love rather than fixing performance issues in your production system!

In this article, we will look at how to derive a query execution plan when using a SQL Server relational database system.

How To Run A Query In Sql Server Management Studio

How To Run A Query In Sql Server Management Studio

An execution plan allows you to understand the operations performed by the database engine when executing a particular SQL query.

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The first step is to parse the SQL query into an AST (Abstract Syntax Tree). During the analysis, the database checks the SQL query syntax and the specified database resources (eg tables, columns). Parsing, removing unnecessary parts, and preoptimizing the query.

How To Run A Query In Sql Server Management Studio

The resulting query tree is passed to the optimizer, which creates a step-by-step list of operations required to obtain the desired result set.

The resulting execution plan is sent to the executor, which executes it and sends the resulting result back to the database client.

How To Run A Query In Sql Server Management Studio

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For brevity, not all columns are included in the implementation plan estimated above. However, you can get an idea of ​​what is in the program and how it can help you figure out what the database engine is doing behind the scenes when executing a given SQL query.

After executing the query, we are interested in getting the estimated execution plan and you should disable it

How To Run A Query In Sql Server Management Studio

Otherwise, the current database session will only generate an estimated execution plan instead of executing the provided SQL queries.

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In the SQL Server Management Studio application, you can easily get an estimated execution plan for any SQL query with a click of a button.

How To Run A Query In Sql Server Management Studio

The actual SQL execution plan is generated by the optimizer when executing the SQL query. If the database table statistics are accurate, the actual project should not differ significantly from the estimate.

After executing the query we are interested in to get the actual execution plan, you need to disable

How To Run A Query In Sql Server Management Studio

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I’m running an online workshop on High Performance SQL on October 11th. If you liked this article, I bet you will also like my books and video courses. Conclusion

If you need to improve the execution of a given SQL query, you should examine the execution plan to determine what is causing the query to run slowly. Without looking at the query execution plan, you cannot tell what the database is doing behind the scenes when it executes a given SQL statement. Slow running queries are one of the common problems in all organizations dealing with large amounts of data. The most challenging problem with every client I work with is how to find the slow queries and what is the real cause of the performance problem. Fortunately, the solution is, in most cases, simple.

How To Run A Query In Sql Server Management Studio

I always recommend spending most of your time on finding the real cause behind the problem and not thinking about possible solutions.

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Fortunately, there are a few tools and techniques that a developer or DBA should always (at least) use to get a fair idea of ​​slow queries.

How To Run A Query In Sql Server Management Studio

Before going into details, I would like to mention here that the tools and techniques I am covering here are intended for SQL developers who are not experts in database administration and database administrators who are at the beginning of their careers.

Note: I am using SQL Server 2016 for my test cases in this article. If you have an earlier version, you won’t have access to the query store, but all other tools will work.

How To Run A Query In Sql Server Management Studio

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As with all types of work in the world, special tools are required. The process of identifying slow queries is no different. In this article I will only mention tools that are already on your computer or that you can download for free. I wouldn’t say that commercial tools don’t really help large companies; I highly recommend saving time by doing a deep analysis on each server to highlight slow running queries. But for the purposes of this article, we prefer to roll up our sleeves and learn the basics using the tools we already have.

The first tool I’ll mention here is a tool integrated into SQL Server Management Studio; “Activity Monitor”. You can view this by right-clicking on the instance name in SQL Server Management Studio and selecting “Activity Monitor”.

How To Run A Query In Sql Server Management Studio

The screenshot above shows an Activity Monitor overview window. This screen displays graphs of processing times, waiting tasks, and block requests. Generally, the lower the number, the better the performance. In large, heavily loaded organizations, there may be a large number of batch requests with high processor times, but this does not necessarily indicate a performance problem.

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After the overview, you should focus on Processes, which gives you access to see all the processes running on your instance and a deeper look at how many processes are waiting, blocked, or blocked. This way you can get an idea if there are slow queries due to some specific wait or if time consuming queries are blocked by other processes. In this view, you can right-click and click any process

How To Run A Query In Sql Server Management Studio

Are actually suspended due to some other process operating on resources the process depends on. So if you see queries being blocked by other processes, check the root blocker which is causing all the blocking

And try to find a solution to this problem. Some of the more common wait statistics are listed in SQL Shack’s Detailed SQL Server Wait Types section. Analyze this in detail for future actions.

How To Run A Query In Sql Server Management Studio

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Active Expensive and Recent Expensive Queries provide information about high CPU, logical reads, or queries that took the longest time.

You can navigate to each section for current or recent price queries. Sort them one by one by elapsed time, logical read and CPU time and check the execution plan. In the implementation plan, you can find out why these expensive queries are taking so long, so that you can take corrective actions to resolve them. In this article I will tell you how to follow the SQL Server query execution plan, so stay tuned.

How To Run A Query In Sql Server Management Studio

. This can be useful and save your life in situations where you are called in the middle of the night to check why SQL Server was slow 1 hour ago.

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Generally, prior to SQL Server 2016, you could not view query execution history without any third-party applications or custom solutions. Hence, Query Store provides value-added functionality in this regard.

How To Run A Query In Sql Server Management Studio

I have written about Query Store here, so check out this article as it is a great resource to go deeper into Query Store.

If you have SQL Server 2016 or later, you must first enable it in database properties. After activation

How To Run A Query In Sql Server Management Studio

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After running the query store, you can expand the database objects and go to “Best Resource Consuming Queries” as shown in the screenshot below:

Note: Wait a couple of days for the production load to catch up in the query store so that you can easily work with the actual load.

How To Run A Query In Sql Server Management Studio

And select “Show resource-intensive queries above” and you will be taken to a window showing these resource-intensive queries. You can customize the view by selecting an appropriate “metric” such as duration, CPU time, logical read or memory consumption. The second thing you need to change is “Statistics”. You can change it to minimum, maximum or average. I recommend using the average statistic along with all the metrics mentioned above to derive queries.

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The next step is to highlight queries that use a lot of resources. After highlighting the map value in the left window (highlighted in the image below), you will get the query execution plan in the window below.

How To Run A Query In Sql Server Management Studio

To get the actual query text for further analysis, you can click on the highlighted button mentioned below in the query store window.

So now you have many ways to get more resource usage queries. Now let’s see how we can check why the queries are slow and what part of the query (if needed) needs to be fixed.

How To Run A Query In Sql Server Management Studio

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So here I take an example of query used in Microsoft sample database “WideWorldImporters”. TSQL executes a “[Integration].[GetOrderUpdates]” stored procedure.

It takes a second to call this stored procedure and I won’t optimize it. This will give you an example of how you can know this and how you can know this

How To Run A Query In Sql Server Management Studio

Spent. We also want to know which part of the query is taking the most time and which tables we should focus on.

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First,

How To Run A Query In Sql Server Management Studio

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