Query latencies in one data center are larger than elsewhere for one replication hierarchy, but only in the high percentiles. This impacts production and traffic is being failed away from that data center to protect production.

When the P50 and P90 look okay, but the P99 and the P99.9 do not, the database(s) operate normally, and only some queries are running slow. The initial guess was “for some queries the plan has flipped, but only in that data center.”

But first let’s have a look at the database size and the schema.

A tiny database

The schema in question holds metadata for a change data capture process, and that is not a lot.

# du -sh *
0    coredumps
5.6G    data
704M    log
0    tmp
# du -sh data/theschema
93M    data/theschema

and in memory:

The mysqld process has a …

We are bringing you another issue of OpenLampTech this week with many great curated articles. Enjoy those you like most and please share the publication with others. Thank you so much for reading!

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

This week in OpenLampTech, we have articles covering:

• MySQL UUIDs
• PHP implode() and explode() functions
• LAMP stack on MySQL HeatWave
• WordPress custom single post template
• And much much more

Head over to the OpenLampTech …

Chapter 9 of Efficient MySQL Performance changed in development. Originally, it was a chapter titled “Not MySQL”, as in “how not to use MySQL.” But we (O’Reilly and I) pulled the chapter, and the current chapter 9 in print is “Other Challenges”: an important laundry list of other challenges engineers using MySQL must be aware of and address. This blog post is a sketch of the unwritten chapter 9: how not to use MySQL.

Chapter 9 of Efficient MySQL Performance changed in development. Originally, it was a chapter titled “Not MySQL”, as in “how not to use MySQL.” But we (O’Reilly and I) pulled the chapter, and the current chapter 9 in print is “Other Challenges”: an important laundry list of other challenges engineers using MySQL must be aware of and address. This blog post is a sketch of the unwritten chapter 9: how not to use MySQL.

Chapter 9 of Efficient MySQL Performance changed in development. Originally, it was a chapter titled “Not MySQL”, as in “how not to use MySQL.” But we (O’Reilly and I) pulled the chapter, and the current chapter 9 in print is “Other Challenges”: an important laundry list of other challenges engineers using MySQL must be aware of and address. This blog post is a sketch of the unwritten chapter 9: how not to use MySQL.

Overview One of the best things the DevOps movement has ushered in is the concept of Infrastructure as Code. IaC lets you define your infrastructure in specially formatted files, and allows you to use automation tools to create or modify your infrastructure based on those files. But did you know that you can also manage your database schemas in a similar approach? Atlas CLI is a command line tool that helps manage the structure of your database by keeping a representation of the schema in a file. It can be used by itself to manage your schema changes, or as part of a CI/CD pipeline to automate the process of updating your schema based on the definition file. In this article, we’ll cover the basics of using Atlas CLI to generate a schema definition file, as well as updating the schema of a PlanetScale database using the tool. To follow along, you should have the following: A PlanetScale account. The PlanetScale CLI installed and configured. The …

Learn how to use Atlas CLI with PlanetScale to define your database as code.

This article outlines the basic configurations for setting up and deploying Percona XtraDB Cluster 8.0 (PXC) on Amazon EC2, as well as what is new in the setup compared to Percona XtraDB Cluster 5.7.

What is Percona XtraDB Cluster an ideal fit for?

Percona XtraDB Cluster is a cost-effective, high-performance clustering solution for mission-critical data. It combines all the improvements, and functionality found in MySQL 8 with Percona Server for MySQL‘s Enterprise features and Percona’s upgraded Galera library.

A Percona XtraDB Cluster environment is an ideal fit for applications requiring 5-9s uptime with high read …

list of conferences where you can MySQL.

The availability of MySQL HeatWave on Amazon Web Services (AWS) was announced on Monday, September 12, extending Oracle’s commitment to multi-cloud access. Many industry experts applaud this new platform support for MySQL HeatWave -- some of their quotes are included here.