Introduction

As a SQL Server DBA, I’ve often wondered about the impact of Query Store size on my databases. It’s a common concern, especially when storage isn’t an issue. In this article, we’ll dive into the world of Query Store and explore whether its size should be a cause for concern. Join me on this journey as we uncover the truth behind Query Store size and learn how to manage it effectively.

What is Query Store?

Query Store is a powerful feature introduced in SQL Server 2016. It’s like a friendly assistant that keeps track of your query performance history. With Query Store, you can easily identify problematic queries, analyze their execution plans, and even force better plans for optimal performance. It’s a game-changer in the world of SQL Server performance tuning!

Does Query Store Size Matter?

Now, let’s address the elephant in the room: does Query Store size really matter? The short answer is: it depends. If storage is not a concern in your environment, then the size of Query Store shouldn’t keep you up at night. SQL Server is designed to handle large amounts of data efficiently, and Query Store is no exception.

However, it’s important to keep an eye on the growth of your Query Store. If it starts consuming a significant percentage of your database size, it might be time to take action. But don’t worry, I’ll share some tips on managing Query Store size later in this article.

Benefits of Query Store

Before we dive into managing Query Store size, let’s take a moment to appreciate its benefits. Query Store is like a time machine for your query performance. It captures and retains a history of executed queries, allowing you to:

• Identify and troubleshoot performance issues
• Compare query performance over time
• Analyze query execution plans
• Force better execution plans for problematic queries

With Query Store, you have a powerful tool at your disposal to ensure optimal database performance.

Managing Query Store Size

If you find yourself in a situation where Query Store is growing larger than expected, don’t panic! Here are some strategies to keep its size under control:

1. Configure Query Store retention: By default, Query Store retains data for 30 days. You can adjust this retention period based on your needs. If you don’t require a long history, consider reducing the retention period to keep the size in check.
2. Set appropriate Query Store capture mode: Query Store offers different capture modes: All, Auto, and None. Choose the capture mode that aligns with your performance monitoring requirements. If you don’t need to capture all queries, consider using the Auto mode, which intelligently captures relevant queries.
3. Monitor and purge Query Store data: Regularly monitor the size of your Query Store using DMVs like sys.database_query_store_options. If the size becomes too large, you can manually purge older data using the ALTER DATABASE command with the CLEAR QUERY STORE option.

Remember, managing Query Store size is all about finding the right balance between retaining valuable performance data and keeping storage consumption in check.

Conclusion

In the grand scheme of things, the size of Query Store shouldn’t be a major concern if storage is not an issue. SQL Server is well-equipped to handle large amounts of data, and Query Store is designed to provide valuable insights into query performance.

However, it’s always a good practice to monitor and manage the size of Query Store to ensure optimal performance and storage utilization. By configuring retention settings, choosing the appropriate capture mode, and regularly purging old data, you can keep your Query Store lean and mean.

So, go ahead and embrace the power of Query Store without worrying too much about its size. With a little bit of management and monitoring, you’ll have a trusty sidekick in your quest for SQL Server performance excellence!