The binary version for MySQL Cluster 7.2.7 has now been made available at http://www.mysql.com/downloads/cluster/ (GPL version) or https://support.oracle.com/ (commercial version).

A description of all of the changes (fixes) that have gone into MySQL Cluster 7.2.7 (compared to 7.2.6) are available from the 7.2.7 Change log.

Introduction

Attracting over 2m subscribers in just 4 months and growing by 30,000 new users per day, Playful Play needed a database that was able to keep pace with the massive scalability and high availability demands of the wildly successful La Vecindad de El Chavo Facebook game.

Playful Play selected MySQL Cluster CGE running on a public cloud to power their gaming platform, providing:

• 45% improvement in performance;
• 99.999% uptime;
• 80% reduction in DBA overhead;
• Local language support, 24x7.

As a result, Playful Play has been able to maintain user growth rates and attract new advertisers to the platform, while enhancing agility and reducing cost. …

Engineering threads within a Data Node

A new version of the white paper “Guide to Optimizing Performance of the MySQL Cluster Database” has been released; download it here.

This paper steps you through:

• Identifying if your application is a good fit for MySQL Cluster
• Measuring performance and identifying problem performance areas to address
• Optimizing performance:
  • Access patterns
  • Using Adaptive Query Localization for complex Joins
  • Distribution aware applications
  • Batching operations
  …

MySQL Cluster partitioning key

I’ll be presenting a webinar covering MySQL Cluster performance on Thursday, July 26. As always, the webinar will be free but you’ll need to register here – you’ll then also receive a link to the charts and a recording of the session after the event.

The replay of this webinar is now available from here.

Here’s the agenda (hoping that I can squeeze it all in!):

• Introduction to MySQL Cluster
• Where does MySQL Cluster fit?
• Benchmarks:
  • ANALYZE TABLE
  …

In my last post, I wrote that I observed many similarities between TokuDB and MySQL Cluster. Many features that benefit TokuDB also benefit MySQL Cluster, and vice versa, with Hot Column Addition and Deletion (HCAD) being an example. Over my next few posts, I expand on some more of these possibly unexpected similarities.

Today I want to focus on optimizer support for clustering keys. Both MySQL Cluster and TokuDB can benefit from the MySQL optimizer supporting clustering keys. For TokuDB, the benefit is obvious, as TokuDB supports clustering keys. A non-negligible part of our effort is changing the …

The MySQL Cluster engineering team recently ran a live webinar, available now on-demand demonstrating the ClusterJ and ClusterJPA NoSQL APIs for MySQL Cluster, and how these can be used in building real-time, high scale Java-based services that require continuous availability.

Attendees asked a number of great questions during the webinar, and I thought it would be useful to share those here, so others are also able to learn more about the Java NoSQL APIs.

First, a little bit about why we developed these APIs and why they are interesting to Java developers.

ClusterJ and Cluster JPA

ClusterJ is a Java interface to MySQL Cluster that provides either a static or dynamic domain object model, similar to the data model used by JDO, …

These past couple of weeks have been quite intense and generated a lot of news.

What stood out to me was the escalation in the race between MySQL/Oracle and MariaDB to be better. I have to say that all of us are benefiting from this competition. I am also not fully sure that Oracle would have put in such effort if Monty and his team was not pushing so hard. Certainly, Thomas Ulin has his agenda, but Monty is doing a great job for his product and in pushing the competitor to do his best. The result is that MySQL is becoming a better product day by day.

Thanks guys!

MySQL Internals

Is it a crazy idea to use MySQL for Json and HTTP embedded? I love crazy things, and this seems crazy, but it is closer to our reality than we can imagine:

“PoC: HTTP, JSON, JavaScript, Map&Reduce built-in to MySQL

What if MySQL had an HTTP interface and would reply JSON? What if MySQL …

The South East LinuxFest is this weekend (June 7-9) in Charlotte, North Carolina and SkySQL will be attending the conference both as a sponsor and with talks. 

read more

Stalls During DDL, Faster DROP TABLE Courtesy of the InnoDB Team

Mark Callaghan mentioned a simple issue on DDL operation. I found the back porting interesting, but not always a possible option. I have nothing to comment on top of what was already stated there, but I’ll mention it because it is interesting to read.

Why do threads sometimes stay in ‘killed’ state in MySQL?

Customers often ask me (and I believe all MySQL DBAs can relate): “Why did that query remain in a KILL state and does not go away?”

As we know, KILLed queries remain in MySQL until a clean up takes place, given that the action is not done synchronously. I found this article to be a good description of such events …

Summary (aka TL/DR):

Support for Foreign Key constraints has been one of the most requested feature enhancements for MySQL Cluster. We are therefore extremely excited to announce that Foreign Keys are part of the first Labs Release of MySQL Cluster 7.3 – available for download, evaluation and feedback now! (Select the mysql-cluster-7.3-labs-June-2012 build)

In this blog, I will attempt to discuss the design rationale, implementation, configuration and steps to get started in evaluating the first MySQL Cluster 7.3 Labs Release.

Pace of Innovation

It was only a couple of months ago that we announced the General …