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89 blog posts in 13 categories

Become a MySQL DBA blog series - Troubleshooting Galera cluster issues - part 2

This is part 2 of our blog on how to troubleshoot Galera cluster - SST errors, and problems with network streaming. In part 1 of the blog, we covered issues ranging from node crashes to clusters that won’t restart, network splits and inconsistent data. Note that the issues described are all examples inspired from real life incidents in production environments.

Become a MySQL DBA blog series - Troubleshooting Galera cluster issues - part 1

In this blog post, we are going to show you some examples of things that can go wrong in Galera - inexplicable node crashes, network splits, clusters that won’t restart and inconsistent data. We’ll take a look at the data stored in log files to diagnose the problems, and discuss how we can deal with these.

ClusterControl Tips & Tricks for MySQL: Max Open Files

You have created a large database with thousands of tables (> 5000 in MySQL 5.6). Then you want to create a backup using xtrabackup. Or, if it is a Galera cluster, you have to recover a galera node using wsrep_sst_method=xtrabackup[-v2].

Become a MySQL DBA blog series - Galera Cluster diagnostic logs

In a Galera cluster, whether you use MariaDB Cluster, Percona XtraDB Cluster or the Codership build, the MySQL error log is even more important. It gives you the same information as MySQL would, but you’ll also find in it information about Galera internals and replication. This data is crucial to understand the state of your cluster and to identify any issues which may impact the cluster’s ability to operate. In this post, we’ll try to make the Galera error log easier to understand.

ClusterControl Tips & Tricks: Updating your MySQL Configuration

Requires ClusterControl 1.2.11 or later. Applies to MySQL based clusters. From time to time it is necessary to tune and update your configuration. Here we will show you how you can change/update  individual parameters using the ClusterControl UI. Navigate to Manage > Configurations.

How to Deploy and Manage MaxScale using ClusterControl

We were delighted to announce that ClusterControl now supports MaxScale, the intelligent database gateway from the MariaDB team. In this blog, we will show you how to deploy and manage MaxScale from ClusterControl. We previously blogged about MaxScale, read it if you’d like a quick overview and introduction. We also published a quick benchmark of HAProxy vs MaxScale.

Become a MySQL DBA blog series - Database upgrades

In this blog post, we will cover one of the most basic tasks of the DBA - minor and major database upgrades. This is the sixth installment in the ‘Become a MySQL DBA’ blog series. Our previous posts in the DBA series include Replication Topology Changes, Schema Changes, High Availability, Backup & Restore, Monitoring & Trending.

Deploying Galera Cluster for MySQL using Vagrant

Vagrant is a system that allows you to easily create and move development environments from one machine to another. Simply define what type of VM you want in a file called Vagrantfile and then fire them up with a single command. It integrates well with virtual machine providers like VirtualBox, VMware and AWS. In this blog, we’ll show you how to expedite the deployment of your development environment using some Vagrant boxes we’ve put together.

Become a MySQL DBA blog series - Common operations - Schema Changes

This is the fourth installment in the 'Become a MySQL DBA' series, and discusses the different approaches to schema changes in MySQL. Our previous posts in the DBA series include High Availability, Backup & Restore and Monitoring & Trending.

Introducing ClusterControl Developer Studio and Creating your own Advisors in JavaScript

With ClusterControl 1.2.10, we introduced our new, powerful ClusterControl DSL (Domain Specific Language), which allows you to extend the functionality of your ClusterControl platform by creating Advisors, Auto Tuners, or “mini Programs”. The DSL syntax is based on JavaScript, with extensions to provide access to ClusterControl’s internal data structures and functions. The DSL allows you to execute SQL statements, run shell commands/programs across all your cluster hosts, and retrieve results to be processed for advisors/alerts or any other actions.