Ideas, releases, practical guides, and perspectives from the people building with MySQL.
Percona announces the release of Percona XtraDB Cluster 5.6.41-28.28 (PXC) on September 18, 2018. Binaries are available from the downloads section or our software repositories.
Percona XtraDB Cluster 5.6.41-28.28 is now the current release, based on the following:
Fixed Bugs
It’s 2018. Maybe now is the time to start migrating your network to IPv6, and your database infrastructure is a great place to start. Unfortunately, many legacy applications don’t offer the option to connect to MySQL directly over IPv6 (sometimes even if passing a hostname). We can work around this by using ProxySQL’s IPv6 support which was added in version 1.3. This will allow us to proxy incoming IPv4 connections to IPv6-only database servers.
Note that by default ProxySQL only listens on IPv4. We don’t recommended changing that until this bug is resolved. The bug causes ProxySQL to segfault frequently if listening on IPv6.
In this example I’ll use centos7-pxc57-1 as my database server. It’s running …
[Read more]This blog will show how to install the Percona XtraDB Cluster on three CentOS 7.3 servers, using the packages from Percona repositories. This is a step-by-step installation and configuration blog, We recommend Percona XtraDB Cluster for maximum availability / reliability and scale-out READ/WRITE optimally. We are an private-label independent and vendor neutral consulting, support, managed services and education solutions provider for MySQL, MariaDB, Percona Server and ClickHouse with core expertise in performance, scalability, high availability and database reliability engineering. All our blog posts are purely focussed on education and research across open source database systems infrastructure operations. To engage us for building and managing web-scale database infrastructure operations, Please contact us on contact@minervadb.com
This cluster will be assembled of three servers/nodes:
…[Read more]This blog will show how to install the Percona XtraDB Cluster on three CentOS 7.3 servers, using the packages from Percona repositories. This is a step-by-step installation and configuration blog, We recommend Percona XtraDB Cluster for maximum availability / reliability and scale-out READ/WRITE optimally. We are an private-label independent and vendor neutral consulting, support, managed services and education solutions provider for MySQL, MariaDB, Percona Server and ClickHouse with core expertise in performance, scalability, high availability and database reliability engineering. All our blog posts are purely focussed on education and research across open source database systems infrastructure operations. To engage us for building and managing web-scale database infrastructure operations, Please contact us on contact@minervadb.com
This cluster will be assembled of three …
[Read more]I was recently asked a question by mail about MySQL Lossless Semi-Synchronous Replication. As I think the answer could benefit many people, I am answering it in a blog post. The answer brings us to the internals of transaction committing, of semi-synchronous replication, of MySQL (server) crash recovery, and of storage engine (InnoDB) crash recovery. I am also debunking some misconceptions that I have often seen and heard repeated by many. Let’s start by stating one of those misconceptions.
One of those misconceptions is the following (this is NOT true): semi-synchronous enabled slaves are always the most up-to-date slaves (again, this is NOT true). If you hear it yourself, then please call people out on it to avoid this spreading more. Even if some slaves have semi-synchronous replication disabled (I will use semi-sync for …
[Read more]In this post we will see a case study of a Galera Cluster migration to AWS Aurora and quick solution to the replication issue. A friend received an error in…
The post Galera cluster to AWS Aurora migration & HA_ERR_FOUND_DUPP_KEY first appeared on Change Is Inevitable.
Recently, I wrote a blog post showing how to enforce SELinux with Percona XtraDB Cluster (PXC). The Linux distributions derived from RedHat use SELinux. There is another major mandatory discretionary access control (DAC) system, AppArmor. Ubuntu, for example, installs AppArmor by default. If you are concerned by computer security and use PXC on Ubuntu, you should enforce AppArmor. This post will guide you through the steps of creating a profile for PXC and enabling it. If you don’t want to waste time, you can just grab my profile, it seems to work fine. Adapt it to your environment if …
[Read more]Please join Percona’s Architect, Tibi Köröcz as he presents Utilizing ProxySQL for Connection Pooling in PHP on Tuesday August 14, 2018, at 8:00 am PDT (UTC-7) / 11:00 am EDT (UTC-4).
ProxySQL is a very powerful tool, with extended capabilities. This presentation will demonstrate how to use ProxySQL to gain functionality (seamless database backend switch) and correct problems (applications missing connection pooling).
The presentation will be a real-life study on how we use ProxySQL
for connection pooling, database failover and load balancing the
communication between our (third party) PHP-application and our
master-master MySQL-cluster.
Also, we will …
In this post we will review the most important Linux settings to adjust for performance tuning and optimization of a MySQL database server. We’ll note how some of the Linux parameter settings used OS tuning may vary according to different system types: physical, virtual or cloud. Other posts have addressed MySQL parameters, like Alexander’s blog MySQL 5.7 Performance Tuning Immediately After Installation. That post remains highly relevant for the latest versions of MySQL, 5.7 and 8.0. Here we will focus more on the Linux operating system parameters that can affect database performance.
Server and Operating System
Here are some Linux parameters that you should check and consider modifying if you need to improve database performance.
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[Read more]Percona announces the release of Percona XtraDB Cluster 5.7.22-29.26 (PXC) on June 29, 2018. Binaries are available from the downloads section or our software repositories.
Percona XtraDB Cluster 5.7.22-29.26 is now the current release, based on the following:
Deprecated
The following variables …
[Read more]