General query logs and slow query logs remain one of the most popular sources of auditing and diagnostic information in MySQL databases. Customers often ask about the cost of general and slow query logging so I went googling for existing research I could point them to. The data I found was not quite what I hoped for, which is why I decided to do some more testing.

Introduction Logging overhead is an obvious thing and it has been the topic of many blog posts before this one. Sure enough, my Google search returned multiple articles, however I wasn't fully satisfied the findings.
Perhaps the topic is so obvious that DBAs don't revisit it very often. In any case, most of the articles I found were several years old and that presents a few issues:

1. Most of the tests were run on MySQL 5.0 or 5.1.
2. Database hardware isn't what it used to be, which changes the perspective on database performance bottlenecks. …

    Recently we went through an exercise where we moved all of our database masters between data centers. We planned on doing this online with minimal user impact. Obviously when performing this sort of action there are a variety of considerations such as cache consistency and other pieces of shared state in stores like HBase, but the focus of this post will be primarily on MySQL.

    During this move we had a number of constraints. As mentioned above this was to be online when serving production traffic with minimal user impact. In aggregate we service hundreds of thousands of database queries per second. Additionally we needed to encrypt all data transferring between data centers. MySQL replication supports encryption, but connections to the servers themselves present several challenges. Specifically, from a performance standpoint the handshake to establish a connection across a WAN can impact latency if …

Today was the first day of sessions at Percona Live Europe 2016, and it was packed with exciting talks and important information on open source databases. Some of the most anticipated talks are those that cover what to expect in MySQL 8.0.

One of those talks was given by Oracle’s Manyi Lu, Director of Software Development. She discussed MySQL 8.0: what’s new in Optimizer.

In her talk, Manyi discussed what we could look forward to in MySQL 8.0’s optimizer. There are substantial improvements in the optimizer in MySQL 5.7 and MySQL 8.0. Most noticeably, users can now combine relational data with NoSQL using the new JSON features. MySQL also now supports functional indexes through generated columns. …

Percona announces the new release of Percona XtraDB Cluster 5.6.32-25.17 on October 4, 2016. Binaries are available from the downloads area or our software repositories.

Percona XtraDB Cluster 5.6.32-25.17 is now the current release, based on the following:

• Percona Server 5.6.32-78.1
• Galera Replication library 3.17
• Codership wsrep API version 25

Bugs Fixed:

• Fixed DONOR …

Overview

MySQL 8.0 comes with the new design of INFORMATION_SCHEMA subsystem. The blog MySQL 8.0: Improvements to Information_schema provides an overview of the improvements we made. This blog focuses mainly to demonstrate performance of the INFORMATION_SCHEMA in MySQL 8.0, giving us an idea on the kind of performance gain that one can expect.…

In this blog post, we’ll look at MySQL 8.0 general tablespaces.

Introduction

MySQL 8.0 (the DMR version is available now) has two great features (among others):

1. The new data dictionary completely removed *.frm files, which is great
2. The ability to create a tablespace and assign a group of tables to it (originally introduced in 5.7).

With those two options, we can use MySQL for creating multi-tenant environments with a “schema per customer” approach.

Schema per Customer with MySQL 8.0

Using schema per customer with older MySQL versions presents issues  … namely the number of files. (I’ve described …

Here are the last details about the Percona Live 2016 Community Dinner hosted at Booking.com:

you can still register the menu is below the program of the lightning talks is on Giuseppe blog

Booking.com will also do a short talk.  The subject is a surprise !

If you are coming directly to the dinner (not via boats), please bring your registration ticket (electronic version ok) so you can access

The Percona Live Europe Open Source Database Conference 2016 in Amsterdam got off to a great start on Monday with a day of tutorials. One of the ones most anticipated was Become a MySQL DBA Part 1 and Part 2, given by Severalnines’ Johan Andersson (CTO) and Krzysztof Książek (Senior Support Engineer).

This hands-on tutorial is intended to help you navigate your way through the steps that lead to becoming a MySQL DBA. Johan and Krzysztof discussed the most important aspects of managing MySQL infrastructure, as well as shared best practices and tips on how to perform the most common activities.

They covered:

…

• I’m thrilled to naturally be at Percona Live Europe Amsterdam from Oct 3-5 2016. I have previously talked about some of my sessions but I think there’s another one on the schedule already.
• LinuxCon Europe – Oct 4-6 2016. I won’t be there for the whole conference, but hope to make the most of my day on Oct 6th.
• MariaDB Developer’s meeting – Oct 6-8 2016 – skipping the first day, but will be there all day 2 and 3. I even have a session on day 3, focused on compatibility with MySQL, a topic I deeply care about ( …

Oracle Open World 2016 has just finished in San Francisco and we are now about to embark on Percona Live Europe in Amsterdam. I offered a presentation in San Francisco on the MySQL X protocol, the new protocol that Oracle is using to make the DocumentStore work. This new protocol also allow you to send … Continue reading OOW16 talk – MySQL X protocol – Talking to MySQL directly over the Wire

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