In a previous post, I explained how you can collect and plot metrics using MySQL Shell.

This is a new series of article where I will explain how to read and understand some of the generated graphs.

Understanding your workload and seeing the evolution of it over time can help anticipating problems and work on solutions before the breakdown.

Let’s start the series with a concept that is not always well understood or at least not always considered at its true value: MySQL Checkpoint Age.

example of checkpoint age graphInnoDB Checkpointing

Before analyzing the graph, we need to understand what is MySQL InnoDB Checkpointing.

Each change to a data page in the InnoDB Buffer Pool are also written into the Write Ahead Logs.

In the literature they are sometimes called Transaction …

Oftentimes, you need multiple filter conditionals in a WHERE clause in order to target specific rows of data. Continue reading this blog post and learn how to use the AND logical operator in WHERE clause queries…

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

Practice Data

For the practice queries in this post, I’m using the ‘category’ table from the well-known Sakila database:

SELECT *
FROM category;

…

As you are probably aware, Red Hat Enterprise Linux 6 (RHEL 6 or EL 6 in short) officially reached “End of Life” (EOL) on 2020-11-30 and is now in the so-called Extended Life Phase, which basically means that Red Hat will no longer provide bug fixes or security fixes.

Even though EL 6 and its compatible derivatives like CentOS 6 had reached EOL some time ago already, we continued providing binary builds for selected MySQL-related products for this platform.

However, this became increasingly difficult, as the MySQL code base continued to evolve and now depends on tools and functionality that are no longer provided by the operating system out of the box. This meant we already had to perform several modifications in order to prepare binary builds for this platform, e.g. installing custom compiler versions or newer versions of various system …

During previous months, I’ve had some time to satisfy my curiosity about databases in containers and I started to test a little bit MySQL in Kubernetes.
This is how it all began…

In January I had the chance to be trained on Kubernetes attending the Docker and Kubernetes essentials Workshop of dbi services. So I decided to prepare a session on this topic at our internal dbi xChange event. And as if by magic, at the same time, a customer asked for our support to migrate a MySQL database to their Kubernetes cluster.

In general, I would like to raise two points before going into …

During previous months, I’ve had some time to satisfy my curiosity about databases in containers and I started to test a little bit MySQL in Kubernetes.
This is how it all began…

In January I had the chance to be trained on Kubernetes attending the Docker and Kubernetes essentials Workshop of dbi services. So I decided to prepare a session on this topic at our internal dbi xChange event. And as if by magic, at the same time, a customer asked for our support to migrate a MySQL database to their Kubernetes cluster.

In general, I would like to raise two points before going into …

Earlier last week, Oracle released their Q2 releases series. Unlike previous releases, backward compatibility has now been broken with previous versions of MySQL.

MySQL 8.0.29 extended the support for the online DDL algorithm INSTANT. Prior to 8.0.29 only adding columns to the end of the table was supported.

In 8.0.29, this functionality was extended to allow the INSTANT algorithm the ability to add columns in any position of the table as well to drop columns. This new functionality required the redo log version to increase and new redo log types to be added, thus making it incompatible with older versions of the MySQL server and also older versions of Percona Xtrabackup. Please note that an in-place minor version downgrade of …

You know what time it is, right? Yep, it is time for OpenLampTech issue #25. There are several great reads in this week’s newsletter for PHP/MySQL developers. Enjoy them at your leisure and share the publication with other’s who will like the content as well…

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

Ready for some PHP/MySQL content. Here you are!

In OpenLampTech issue #25, visit these article topics:

• MySQL SHOW command
• MySQL data types
• PHP data types
…

I’m always updating VMs, and I was gratified to notice that there’s a Fedora arm64 ISO. If you’re interested in it, you can download the Live Workstation from here or the Fedora Server from here.

Unfortunately, I only have macOS running on i7 and i9 Intel Processors. It would be great to hear back how it goes for somebody one of the new Apple M1 chip.

I typically install the workstation version because it meets my needs to run MySQL and other native Linux development tools. However, the server version is also available. Fedora is a wonderful option, as a small footprint for testing things on my MacBookPro.

In this blog post, we will show you a step-by-step guide on how to install and set up a MySQL server both manually on the Ubuntu 20.04 operating system, as well as by using ScaleGrid’s managed database service. In the following sections of this tutorial, we will help you through every step to successfully set […]

I recently took some time to explore the MySQL GROUP BY WITH ROLLUP modifier. As a self-starter, I’m always unknowingly studying SQL concepts that I soon need for a query requirement. Call it luck or premonition, doesn’t matter to me. I’ll take these small wins thanks to my curiosity…

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

I went for a deep dive into the WITH ROLLUP GROUP BY modifier over on the OpenLampTech publication page.

Read the article, …