If you’re integrating your Node.js service with MySQL, you probably want to execute queries.

I’ve seen a fair bit of ugly code to do this, often using callbacks. I thought I would share some of my own patterns here. Maybe this is useful to others to read.

I don’t typically use ORM’s. If you’re already happy with sequalize, this article is probably not for you.

Prequisites

The most popular NPM package for MySQL is mysql, but I use the mysql2 package instead.

The mysql2 package is also very popular, but has a few advantages. The advantage I care about is support for promises. The authors of this package have actually teamed up with the authors of the mysql package to …

Percona announces the release of Percona Toolkit 3.0.13 for January 9, 2019.

Percona Toolkit is a collection of advanced open source command-line tools, developed and used by the Percona technical staff, that are engineered to perform a variety of MySQL®, MongoDB® and system tasks that are too difficult or complex to perform manually. With over 1,000,000 downloads, Percona Toolkit supports Percona Server for MySQL, MySQL®, MariaDB®, Percona Server for MongoDB and MongoDB.

Percona Toolkit, like all Percona software, is free and open source. You can download packages  …

In less than a month, on February 2–3, the largest open source conference in Europe, FOSDEM, will take place in Brussels. The MySQL Engineering Team will of course attend and present. Here’s a short overview of our sessions. If you want to talk to us about something, or if you just want to listen and learn, this is where you’ll find us:

Friday

On February 1, the day before FOSDEM, we make an early start with a Pre-FOSDEM MySQL Day.…

One of the most exciting features Amazon Aurora Serverless brings to the table is its ability to go to sleep (pause) when idle. This is a fantastic feature for development and test environments. You get access to a powerful database to run tests quickly, but it goes easy on your wallet as you only pay for storage when the instance is paused.

You can configure Amazon RDS Aurora Serverless to go to sleep after a specified period of time. This can be set to anywhere between five minutes and 24 hours

For this feature to work, however, inactivity has to be complete. If you have so much as a single query or even maintain an idle open connection, Amazon Aurora Serverless will not be able to pause.

This means, for example, that pretty much any monitoring you may have enabled, including our own …

Percona Live Open Source Database Conference 2019 in North America has moved to Austin, Texas: a cool place to be, and host to many big names in the tech space. Read what Dave Stokes, MySQL Community Manager for Oracle, has to say in favor of Austin.

If you need a conference ticket for Austin, put in your proposal now!

Those who are successful with their presentation or tutorial submissions will receive a pass to the full three days of the event. Closing date for the call for papers is Sunday, January 20.

Percona is adopting an industry trend by organizing the conference into 13 separate tracks …

Please join Percona’s MySQL Product Manager, Tyler Duzan as he presents Walkthrough of Percona Server MySQL 8.0 on Wednesday, January 9th at 11:00 AM PDT (UTC-7) / 2:00 PM (UTC-4).

Register Now

Our Percona Server for MySQL 8.0 software is the company’s free, enhanced, drop-in replacement for MySQL Community Edition. The software includes all of the great features in MySQL Community Edition 8.0. Additionally, it includes enterprise-class features from Percona made available free and open source. …

An exciting feature-full new version of MySQL (v8.x) was released on April 2018. Along with those exciting features, there were many changes and enhancements done in MySQL's internal optimizer. Naturally, we at EverSQL keep an eye on major changes in MySQL's optimizer, to make sure we are familiar with them and co-exist with them.

So now that 2019 started, I thought it's a good point in time to look back and see how well this new version is adopted by the community. To do that, we surveyed our users for 3 months, from October to December 2018, asking which MySQL database version are they using for their main product's environment. Please note that these results are in no way scientifically-true, nor statistically-true. It's just the data we received and thought it can be interesting to share with the community.

During these 3 months, we received 2000 survey replies from professionals working in companies with more than 5 people. So …

In Part I, we introduced a High Availability (HA) framework for MySQL hosting and discussed various components and their functionality. Now in Part II, we will discuss the details of MySQL semisynchronous replication and the related configuration settings that help us ensure redundancy and consistency of the data in our HA setup. Make sure to check back in for Part III where we will review various failure scenarios that could arise and the way the framework responds and recovers from these conditions.

What is MySQL Semisynchronous Replication?

Simply put, in a …

A few days ago, I stepped into a trap !  This made me lose time for fixing things (and even more for writing this post...).  In the hope that you will avoid my mistake, I am sharing this war story.  I also obviously opened a bug, more about this below.

TL&DR: be careful when using CHANGE MASTER TO MASTER_DELAY = N: it might wipe your relay logs !

As written in the TL&DR, running CHANGE MASTER 

We know that MySQL query cache is deprecated as of MySQL 5.7.20 and removed in MySQL 8.0 and It has been recommended to use ProxySQL (or other) external query cache instead.

In this blog post, we’ll present the ProxySQL query cache functionality and how does it help us.

How to setup ProxySQL between client and database servers is out of the scope of this article.

If you are looking for other articles on ProxySQL Series :

• MySQL replication Read-Write Split up
• Replication Switchover using Proxysql And …