Previous Episodes:

• MySQL-Docker operations. - Part 1: Getting started with MySQL in Docker

After seeing the basics of deploying a MySQL server in Docker, in this article we will lay the foundations to customising a node and eventually using more than one server, so that we can cover replication in the next one.
Enabling GTID: the dangerous approach.To enable GTID, you need to set five variables in the database server:

• master-info-repository=table
• relay-log-info-repository=table
• enforce-gtid-consistency
• gtid_mode=ON
• log-bin=mysql-bin

For MySQL 5.6, you also need to set log-slave-updates, but we won't deal with such ancient versions here.
Using the method …

Some time ago, Peter Boros at Percona wrote this post: Rotating MySQL slow logs safely. It contains good info, such as that one should use the rename method for rotation (rather than copytruncate), and then connect to mysqld and issue a FLUSH LOGS (rather than send a SIGHUP signal).

So far so good. What I do not agree with is the additional construct to prevent slow queries from being written during log rotation. The author’s rationale is that if too many items get written while the rotation is in process, this can block threads. I understand this, but let’s review what actually happens.

Indeed, if one were to do lots of writes to the slow query log in a short space of time, a write could block while waiting.

Is the risk of this occurring greater during a logrotate operation? I doubt it. A FLUSH LOGS has to …

MySQL 5.7 comes with built-in JSON support, comprising two major features:

• A native JSON data type
• A set of built-in functions to manipulate values of the JSON type

Despite being added rather recently (in MySQL 5.7.8 to be precise - one point release number before the 5.7.9 GA version), I feel the JSON support so far looks rather useful. Improvements are certainly possible, but compared to for example XML support (added in 5.1 and 5.5), the JSON feature set added to 5.7.8 is reasonably complete, coherent and standards-compliant.

(We can of course also phrase …

Hi!

Thanks everyone who attended the hands-on lab session on MySQL Cluster at Oracle OpenWorld today.

The following are the links for the slides, the HOL instructions, and the HOL extra instructions.

Will try to summarize the HOL session below.

Aim of the HOL was to help attendees to familiarize with MySQL Cluster. In particular, by:

1. Learning the basics of MySQL Cluster Architecture
2. Learning the basics of MySQL Cluster Configuration and Administration
3. Learning how to start a new Cluster for evaluation purposes and how …

Time really flies. A bit less than 4 months ago, I wrote a post about my decision to join ScaleDB. Today, after 4 months and a lot of excitement working with a great team and genuinely good people, I am proud to announce that the first version of ScaleDB is available to the public.
ScaleDB 15.10 Ararat We decided to number this version 15.10 and to name it Ararat. Indeed, we intend to follow the release cycle of other famous software projects, such as Ubuntu, OpenStack and recently CentOS. Our logo is a peak, we are all about scaling, as in our name and as the main objective of our products.

To scale comes from the Latin word scandere, i.e. …

The client library — libmysqlclient — is part of the same source code repository as the server. It comes both as a dynamic link library (.so), also called a shared library, and as a static link library (.a). During the 5.7 development cycle, we’ve made several improvements to the library, which has resulted in a bump from ABI version 18 to version 20.…

The MySQL family has grown with the introduction of the Router, which brings high-availability and Fabric integration to all MySQL clients independently of any specific connector support for them. This blog focuses on the throughput of the Connection Routing plugin for Router and evaluates the overhead it may bring to application performance compared to direct connection.…

Download MariaDB 10.0.22 Release Notes Changelog What is MariaDB 10.0? MariaDB APT and YUM Repository Configuration Generator The MariaDB project is pleased to announce the immediate availability of MariaDB 10.0.22. This is a Stable (GA) release. See the Release Notes and Changelog for detailed information on this release and the What is MariaDB 10.0? page […]

The post MariaDB 10.0.22 now available appeared first on MariaDB.org.

Here are the slides for my talk at Oracle OpenWorld 2015:

Enjoy!

With MySQL 5.7 becoming GA it’s a good time to highlight how much performance has improved in replication since the 5.6 era. A previous blog post focused on the performance of the multi-threaded slave applier and on this one the target is the semi-synchronous replication plug-in (SemiSYNC), whose performance has improved greatly.…