When you run a simple write, …it may look simple, but under the hood, MySQL’s InnoDB engine kicks off a pretty complex sequence to ensure your data stays safe, consistent, and crash-recoverable. In the top-left corner of the diagram, we see exactly where this begins — the moment the query is executed: [crayon-68cc95fd85331816155957/] The log […]

How do you know if your backup is truly reliable? The last thing you want is to discover your data is corrupted during a critical restore or during a migration. While MyDumper is a powerful tool for logical backups, its -M option takes backup integrity to the next level by creating checksums. This often-overlooked feature […]

It may be surprising when a new InnoDB Cluster is set up, and despite not being in production yet and completely idle, it manifests a significant amount of writes visible in growing binary logs. This effect became much more spectacular after MySQL version 8.4. In this write-up, I will explain why it happens and how to address […]

When troubleshooting a MySQL crash, having only the error log is rarely enough to pinpoint the exact root cause. To truly understand what happened, we need to go deeper—into the memory state of the process at the moment it crashed. That’s where GDB, the GNU Debugger, comes in. GDB lets us inspect a core dump […]

In my previous blog post, Understanding trx-consistency-only on MyDumper Before Removal, I talked about --trx-consistency-only removal, in which I explained that it acts like a shortcut, reducing the amount of time we have to block the write traffic to the database by skipping to check if we are going to backup any non-transactional tables. Now, […]

At Percona, we’ve always been dedicated to providing robust, open source high availability solutions that meet our users’ evolving needs. Percona XtraDB Cluster (PXC) stands as a testament to this commitment, offering a highly available and scalable solution for your MySQL and Percona Server for MySQL deployments. We understand that database high availability is critical […]

Managing farms of MySQL servers under a replication environment is very efficient with the help of a MySQL orchestrator tool. This ensures a smooth transition happens when there is any ad hoc failover or a planned/graceful switchover comes into action. Several configuration parameters play a crucial role in controlling and influencing failover behavior. In this […]

TL;DR Percona Server for MySQL now offers experimental support for stored programs in the JS language. This free and open source alternative to Oracle’s Enterprise/Cloud-only feature enables users to write stored programs in a more modern, convenient, and often more familiar language. It is still in active development, and we would very much like your […]

In this blog, we continue from where we left off in the previous post, InnoDB Cluster Setup: Building a 3-Node High Availability Architecture, where we demonstrated how to set up a MySQL InnoDB Cluster with three nodes to achieve high availability. Here, we walk through the step-by-step process of performing a rolling upgrade of that […]

Setting up an InnoDB Cluster requires three key components: Group Replication, MySQL Shell, and MySQL Router. In the previous post, we covered the process of building a 3-node InnoDB Cluster. In this post, we shift our focus to configuring MySQL Router and validating failover functionality. Environment overview We are using three InnoDB Cluster nodes along […]