The latest from the MySQL community

The preFOSDEM MySQL Belgian Days 2025 will occur at the usual place (ICAB Incubator, Belgium, 1040 Bruxelles) on Thursday, January 30th, and Friday, January 31st, just before FOSDEM. Again this year, we will have the chance to have incredible sessions from our Community and the opportunity to meet some MySQL Engineers from Oracle. DimK will […]

This is the agenda of the preFOSDEM MySQL Belgian Days 2025, an Oracle MySQL technical event managed by the MySQL Community Team for customers, partners & community users.

This article will be helpful if you use the Percona Monitoring and Management (PMM) instance and alert notifications, as it is nice to capture the image of the graph when you receive the alert. We will see how to capture and attach the image of the graph when receiving the alert notification (email, telegram, Slack, […]

Here is part two of my MySQL with Diagrams series (Here’s part one – MySQL with Diagrams Part One: Replication Architecture). We are going to explore how MySQL handles thread termination using the KILL command, as visualized in the provided diagram, and provide sample demonstrations to help you better understand. Many people think they know […]

This blog post is about importing and exporting databases in MySQL or MariaDB. Importing and Exporting are fundamental processes that ...

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The post How To Import and Export Databases in MySQL or MariaDB appeared first on RoseHosting.

Did you ever need to determine the performance of a query over time? One of the problems with database query optimizations is that the underlying data is always churning. Add in an increase in the number of users, expanding server demand use, and other items that impact your query. What was optimized is no longer performing as expected.

MySQL added a JSON format option to the output of the EXPLAIN command quite a while ago. More recently, Oracle added the feature of saving the output into a variable (see https://dev.mysql.com/doc/refman/9.0/en/mysql-nutshell.html and https://dev.mysql.com/blog-archive/explain-into-and-explain-for-schema-in-mysql-81-and-82). This provides a way to access the data in that variable and plop it into a database. The saved result can be compared to current or other past responses for analysis. 

mysql> explain format=json into @var
       SELECT * from …

At Percona, we’ve always prioritized performance, and recent trends in MySQL’s development have been a point of concern for us. In particular, the performance deterioration in the MySQL 8.4.x and 9.y versions caught our attention, as highlighted in Marco Tusa’s insightful blog post, Sakila, Where Are You Going? We’re pleased to report that the latest […]

Percona Toolkit 3.7.0 has been released on Dec 23, 2024. The main feature of this release is MySQL 8.4 support.

In this blog, I will explain what has been changed. A full list of improvements and bug fixes can be found in the release notes.

TLDR;

• Replication statements in 8.4 are fully supported by the Percona Toolkit
• pt-slave-delay has been deprecated.
• pt-slave-find has been renamed to pt-replica-find. The old name has been deprecated but exists in the repository as an alias of the pt-replica-find.
• pt-slave-restart has been renamed to pt-replica-restart. Old name has been deprecated but exists in the repository as an alias of the …

Used to be that replication lag was as simple as Seconds_Behind_Master (renamed to Seconds_Behind_Source). But with multi-threaded replication (MTR) this is no longer the case. It’s time to relearn replication lag monitoring using Performance Schema tables.

For this penultimate article before Christmas, let's announce the 30th anniversary of MySQL!