Interpreting the results and exit codes of your upgrade tests is essential for assessing the process’s outcome. In this blog, we’ll explore the significance of pt-upgrade return codes and how…
The post Understanding Return Codes of pt-upgrade: A quick guide first appeared on Change Is Inevitable.
Learn how Multi-Valued Indexing in MySQL 8.0 can enhance query performance by efficiently indexing and querying JSON arrays. Discover the benefits, implementation steps, and considerations for optimizing your MySQL database.
EverSQL is a platform that intelligently tunes your SQL queries by providing query optimization recommendations, and feedback on missing indexes. This is the second post of our EverSQL series, if you missed our introductory post take a look there first and then come back to this article.
We’ll use the Stackoverflow data set again as we did in our first post.
Diving into query optimization
We’ll grab the worst performing query in the list from PMM and optimize it. This query builds a list of the top 50 most recent posts which have a score greater than two, and involves joining two large tables – posts and comments. The original runtime of that query is …
[Read more]A common challenge with continuously deployed applications is that new and modified SQL queries are constantly being introduced to the application. Many companies choose to use a database monitoring system (such as PMM) to identify those slow queries. But identifying slow queries is only the start – what about actually optimizing them?
In this post we’ll demonstrate a new way to both identify and optimize slow queries, by utilizing the recent integration of Percona Monitoring and Management with EverSQL Query Optimizer via Chrome browser extension. This integration allows you to identify slow queries using PMM, and optimize them automatically using EverSQL Query Optimizer.
Optimizing queries with PMM & EverSQL
We’re using PMM to monitor our MySQL …
[Read more]In this blog post, we’ll look at ways you can use MySQL 5.7 generated columns (or virtual columns) to improve query performance.
Introduction
About two years ago I published a blog post about Generated (Virtual) Columns in MySQL 5.7. Since then, it’s been one of my favorite features in the MySQL 5.7 release. The reason is simple: with the help of virtual columns, we can create fine-grained indexes that can significantly increase query performance. I’m going to show you some tricks that can potentially fix slow reporting queries with GROUP BY and ORDER BY.
The Problem
Recently I was working with a customer who was struggling with this query:
SELECT CONCAT(verb, ' - …[Read more]
MySQL has a nice feature, slow query log, which allows you to log all queries that exceed a predefined about of time to execute. Peter Zaitsev first wrote about this back in 2006 – there have been a few other posts here on the MySQL Performance Blog since then (check this and this, too) but I wanted to revisit his original subject in today’s post.
Query optimization is essential for good database …
[Read more]The Percona Cloud Tools beta service continues to grow its query analysis capabilities with new features for reviewing queries. These enhancements will:
Join the hundreds of other users who are using Percona’s MySQL expertise and Percona Cloud Tools to improve the performance of their applications. Of course, it’s free during the beta.
What’s newQuery Review
Query Review gives you the right resources to efficiently review your application’s most important database activities. New tools enable you to assess, categorize, and comment on each of your application’s queries.
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