Query Reviews part 2: pt-query-digest

One task that can really help reduce future problems is to do a periodic query review. I’ve been using pt-query-digest to do this since 2010 (back when it was part of Ma’atkit, mk-query-digest!), and while I have presented the idea several times at conferences, I have never blogged about it.

I am going to share a secret with you – I blog not just to share information with YOU, but to share information with ME. Future me. This comes up because I am working on a query review at Salesforce.com for one of our busiest shards. I went to go look up a blog post on using pt-query-digest, because it’s a handy cheat sheet….and….I never did it. So, here goes!

This is the first blog post in what will …

Dear MySQL Users,

MySQL Connector/J 5.1.42, a maintenance release of the production 5.1
branch has been released. Connector/J is the Type-IV pure-Java JDBC
driver for MySQL.

MySQL Connector Java is available in source and binary form from the
Connector/J download pages at
http://dev.mysql.com/downloads/connector/j/5.1.html
and mirror sites as well as Maven-2 repositories.

MySQL Connector Java (Commercial) is already available for download on the
My Oracle Support (MOS) website. This release will be available on eDelivery
(OSDC) in next month’s upload cycle.

As always, we recommend that you check the “CHANGES” file in the
download archive to be aware of changes in behavior that might affect
your application.

MySQL Connector/J 5.1.42 includes the …

The place is still frantic here at Percona Live 2017 as everybody tries to squeeze in a few more talks before the end of the day. One such talk was given by Red Hat’s Stefan Negrea on Hawkular Metrics.

Hawkular Metrics is a scalable, long-term, high-performance storage engine for metric data. The session was an overview of the project that includes the history of the project, an overview of the Hawkular ecosystem, technical details of the project, developer features and APIs and third party integrations.

Hawkular Metrics is backed by Cassandra for scalability. Hawkular Metrics is used and exposed by Hawkular Services.The API uses JSON to communicate with clients.

Users of Hawkular Metrics include: …

The last day of Percona Live 2017 is still going strong, with talks all the way until 4:00 pm (and closing remarks and a prize giveaway on the main stage then). I’m going to a few more sessions today, including one from Stephane Combaudon from Slice Technologies: Lessons learned while automating MySQL deployments in the AWS Cloud.

In this talk, Stephane discussed how automating deployments is a key success factor in the cloud. It is actually a great way to leverage the flexibility of the cloud. But often while automation is not too difficult for application code, it is much harder for databases. When Slice started automating their MySQL servers at Slice, they chose simple and production-proven …

Welcome to the third (and final) day of the Percona Live Open Source Database Conference 2017, and the third (and final) set of Percona Live keynotes! The enthusiasm hasn’t waned here at Percona Live, and we had a full house on Thursday morning!

Day three of the conference kicked off with three keynotes talks, and ended with the Community Awards Ceremony:

Spinaltap: Airbnb’s Change Data Capture System

Xinyao Hu (AirBnB)

In this talk, Xinyao introduced Airbnb’s change data change system, Spinaltap. He briefly covered its design, and focused on various use cases inside Airbnb. These use cases covered both online …

The recent “Unified Data Dictionary Lab Release” quietly delivered an important change to the MySQL server with InnoDB engine: the “InnoDB System Tables” are now officially “decommissioned”. And InnoDB is now deriving its metadata from the new “Transactional Data Dictionary” delivered in 8.0.0 DMR.…

phpMyAdmin is the most popular and most widely used web-based database management tools. It a free and open source PHP application, that allows the users to manage single or multiple SQL database servers, locally or on a remote server using a web browser with easy to use graphic user interface. Today, we are going to […]

Every day at Percona Live 2017 brings something new and unusual – and on this particular day, we found out that MySQL makes toast.

A lot of people think that with MySQL and open source software, you can do anything. While many might view this metaphorically, Percona’s Alexander Rubin (Principal Consultant) takes this statement very seriously. He demonstrated on Tuesday at Percona Live that not only is possible to accomplish just about anything with MySQL, but MySQL makes toast!

Originally, Alexander took on this project to provide an open source fix for MySQL Bug#2 (MySQL Doesn’t Make Toast). After some effort, and some ingenuity, he provided a patch for the infamous bug.

…

Percona Live 2017 is done for Wednesday, but there was still time to get in one more talk before tonight’s Community Networking Reception – and the last one of the evening was about Amazon RDS.

Darin Briskman, Lead Developer Outreach & Technical Evangelist for Amazon, held two back-to-back sessions on Database management made simple – Amazon RDS. Amazon Relational Database Service (or Amazon RDS) is a distributed relational database service by Amazon Web Services (AWS).

Darin reviewed how Amazon Relational Database Service (Amazon RDS) makes it easy to set up, operate, and …

The afternoon at Percona Live 2017 is slipping by quickly, and people are still actively looking for sessions to attend – like the session I just sat in on histograms in MySQL and MariaDB.

Histograms are a type of column statistic that provides more detailed information about data distributions in table columns. A histogram sorts values into buckets.

MariaDB Server has had histograms since MariaDB 10.0. Now, MySQL 8.0 will have them too. This session presented an overview of histogram implementations in MariaDB, MySQL 8.0, and looked at PostgreSQL for comparison. The session covered everything about histograms:

• Why do query optimizers need histograms
• What are the costs of collecting and maintaining a …