Some of you may use MySQL’s asynchronous replication feature called Semisynchronous Replication (aka semi-sync), and now with the MySQL Semi-Sync Summary Dashboard + Percona Monitoring and Management (PMM), you can see the most important metrics! Refer to the Install & Usage steps for deployment details (note you need Replication Set defined!).

What is Semisynchronous Replication

When enabled, Semisynchronous Replication instructs the Primary to wait until at least one replica has received and logged the event to the replica’s local relay log before completing the COMMIT on a transaction. This provides a higher level of data integrity because now it is known that the data exists in two places. This feature ensures a balance …

The Problem

I recently worked on a customer engagement where the customer needed to archive a high amount of rows from different tables into another server (in this example for simplicity I am just archiving the results into a file). 

As explained in this other blog post, “Want to archive tables? Use Percona Toolkit’s pt-archiver“, you can use pt-archiver to purge/archive rows from a table that match any “WHERE” condition, but this case was not that easy as the archive/delete condition was complex and involved joining many tables…

The archive conditions involved four tables with the following query and the following table schema. In the example, there are no foreign keys, but this method can be used also with foreign keys by reordering the table archive/purge.

And the delete condition is …

Don’t Try This at Home!

Disclaimer: The procedure described in this blog post is not officially supported by Percona XtraBackup. Use it under your responsibility. I tested and used it successfully, but your mileage may vary.

Note from the author: Wikipedia defines clickbait as text (or a link) that is designed to attract attention and to entice users to read that online content, with a defining characteristic of being deceptive. Maybe the headline of this post is a bit deceptive, as there is no Percona XtraBackup for Windows, but I hope you will not feel deceived after reading this blog post, I just felt that it was funny to use a clickbait-style while writing it.

He Couldn’t Believe it When He Read That Post!

Pep had to migrate a client database from Windows to Linux …

This quickstart shows you how to use the Azure portal to deploy a dedicated Percona Server for MySQL 8.0 drop-in replacement for MySQL that provides superior performance, scalability, and instrumentation. It also shows you how to connect to the server.

Prerequisites

Existing Azure subscription. If you don’t have a subscription, create a free Azure account before starting.

Create Percona Server for MySQL 8.0 Azure Instance

1. Go to the Azure portal to create a MySQL database using Percona Server for MySQL 8.0 image. Search for and select Percona Server for MySQL 8.0:
2. On the Percona Server for MySQL 8.0 page, press Create:
…

In my talk at Percona Live 2021, “Creating Chaos in Databases”, I discussed how creating a controlled interruption in available resources (I used primary pod and network interruptions) allows us to test the stability of a database, and in our case, Percona XtraDB Cluster.

I also mentioned in the talk that my testing led to diagnosing a few unpleasant bugs, namely:

• PXC-3437: Node fails to join in the endless loop
• PXC-3580: Aggressive network outages on one node makes the whole cluster unusable
• …

The practice of running databases in containers continues to grow in popularity.  As a Technical Account Manager at Percona, I get asked regularly about our Percona Distribution for MySQL Operator.  Additionally, I’m asked what I’m seeing in the industry in terms of adoption.  In most cases, the questions stem around new deployments.  Our DBaaS tool (currently in Technical Preview) makes launching a new cluster in a Kubernetes deployment trivial.  

Once the operator completes and verifies the setup, the UI displays the endpoint and credentials and you are on your way.  Voila!  You now have a cluster, behind a load balancer, that you can access from within your k8s cluster or …

In the previous release of our Percona Distribution for MySQL Operator, we implemented one interesting feature, which can be seen as “self-healing”: https://jira.percona.com/browse/K8SPXC-564.

I do not think it got enough attention, so I want to write more about this.

As it is well known, a 3-node cluster can survive a crash of one node (or pod, in Kubernetes terminology), and this case is very well handled by itself. However, if there is a problem with 2 nodes at the same time, this scenario is problematic for Percona XtraDB Cluster. Let’s see why this is a problem.

First, let’s review if the first node goes offline:

In this case, the cluster can continue work, because Node 1 and Node 2 figure out …

The combination of the information obtained from the “pt-summaries” discussed in the previous posts of this series (Part 1: The Percona Support Way, Part 2: Knowing the Server, Part 3: What MySQL?) helps us come up with the first impression of a MySQL server. However, apart from the quick glance we get at two samples of a selective group of MySQL status variables, they provide what I call a “static” view of the server, akin to looking at a still picture of an engine. We get the chance to spot some major discrepancies in the MySQL configuration in view of the available resources in the …

In the previous post of this series, we looked at the hardware specifications and operating system settings of the host server through the lenses of a pt-summary report. Now that we know the foundation on which the database is running, we can turn our focus to MySQL itself. The second of our triad of tools from the Percona Toolkit will help us with that:

pt-mysql-summary conveniently summarizes the status and configuration of a MySQL database server so that you can learn about it at a glance. 

The goal for this part is to find what MySQL distribution and version is being used if the server …

After Oracle released MySQL version 8.0.24 on April 20, 2021, our engineering team got started right away with merging our enhancements to prepare the corresponding 8.0.24 version of Percona Server for MySQL.

However, Oracle released MySQL version 8.0.25 shortly afterward on May 11, 2021, to fix a critical bug that we also observed during our initial testing and reported back to them.

Therefore, we have decided to skip releasing Percona Server for MySQL 8.0.24 both as a standalone product and a distribution as well as the …