MySQL is a proud sponsor of the Mountain Moodle Moot, July 9-11, 2014 – Helena, Montana. There will be sessions back-to-back covering query tuning, system tuning, and little known tricks using MySQL Workbench. This years Moot is already SOLD OUT.

Moodle is a learning management system and very popular with many schools across the world.

There are 3 three amazing social events planned for Friday afternoon – sponsored by Oracle/MySQL. Lunch, a tour train ride and a great social at the Blackfoot Brewery complete with tour and brews.

If you have your ticket and want me to cover anything specific in my sessions, please let me know!

Fre MySQL seminar on 27. august 2014 @ 13:00. Announcement by Oracle User Group Estonia:

Developing modern applications using MySQL.

In this seminar series learn how to best use MySQL for your existing and new development requirements with leading MySQL expert and Oracle Ace Director Ronald Bradford.

These presentations provide a detailed review of the essential lifecycle components for developing a successful software application and offer a checklist for your company to review the design, development, deployment and support of your business applications with MySQL.

The presentations include:

• Effective MySQL Architecture and Design Practices
• Effective Software Development with MySQL
• Effective Web Site Operations
• Upcoming MySQL features for modern applications

Detailed description about …

Earlier this month I wrote about vmstat iowait cpu numbers and some of the comments I got were advertising the use of util% as reported by the iostat tool instead. I find this number even more useless for MySQL performance tuning and capacity planning.

Now let me start by saying this is a really tricky and deceptive number. Many DBAs who report instances of their systems having a very busy IO subsystem said the util% in vmstat was above 99% and therefore they believe this number is a good indicator of an overloaded IO subsystem.

Indeed – when your IO subsystem is busy, up to its full capacity, the utilization should be very close to 100%. However, it is perfectly possible for the IO subsystem and MySQL with it to have plenty more capacity than when utilization is showing 100% – as I will show in an …

In WL#6045 we improved the innochecksum tool so that it opens the tablespace file and validates the checksum for each page. It compares the calculated checksum to the stored checksum in the page and reports mismatches, if any. It can also now rewrite page checksums in the tablespace. It is an offline tool, however, so make sure that the MySQL server is not using the tablespace files when running the innochecksum tool.

When InnoDB encounters a page checksum mismatch, it will cause an ASSERT and perform a forced shutdown. So rather than wait for InnoDB to encounter this in production, it is better to use the innochecksum tool to validate and correct any checksum issues ahead of time. You could perform these checks on your …

Genoscope, the French National Sequencing Center, was created in 1997 and is one of the largest sequencing centers in Europe. Its mission is to acquire, to "sequence" and to analyze the genetic information of various organisms presenting a scientific, medical or economic interest. DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. Genoscope produces various types of data, such as complete or partial genome sequences, that are then compared and analyzed. Following its role as a major actor in the Human Genome Project, Genoscope has changed its orientation toward environmental genomics. Since 2007, Genoscope is part of CEA, the French Alternative Energies and Atomic Energy Commission.

Challenges

• Make a large amount of scientific data available to biologists worldwide via a database combining performance, ease of use and cross-platform …

Créé en 1997, le Genoscope - Centre National de Séquençage - est un grand équipement au service de la communauté scientifique. Sa mission est d'acquérir, de "séquencer", et d'analyser l'information génétique de divers organismes d'intérêt scientifique, médical ou économique. Concrètement, le séquençage consiste à déterminer l'ordre dans lequel s'enchaînent les molécules élémentaires qui constituent les molécules d'ADN. Le Genoscope produit des données de nature diverse - séquences entières ou partielles de génomes ou de produits d'expression des gènes - qu'il compare et interprète. Après avoir été l'un des acteurs du projet génome humain, le Genoscope met aujourd'hui le cap vers la génomique environnementale. Depuis 2007, le Genoscope est intégré à l'institut de Génomique du CEA, le Commissariat à l'énergie atomique et aux énergies alternatives.

Défis

…

Tesora, previously called Parelastic, asked Percona to do a sysbench benchmark evaluation of its Database Virtualization Engine on specific architectures on Amazon EC2.

The focus of Tesora is to provide a scalable Database As A Service platform for OpenStack. The Database Virtualization Engine (DVE) plays a part in this as it aims at allowing databases to scale transparently across multiple MySQL shards.

DVE was open sourced last week. Downloads and …

Good Monday morning! Over the weekend, there was a comment to my previous post covering using Ansible to build Docker images from Michael DeHaan, CTO and creator of Ansible (thank you!) reminding me of his work discussed in his blog post Installing and Building Docker with Ansible that is definitely worth sharing and the method I first used to build Docker images and wrote my first role that will be shared in this post.

For the reader just joining, the previous posts in this series "Docker: Containers for the Masses" are:

• …

Infrequent SQL developers often get confused about when to put parentheses and/or aliases on derived tables. There has been this recent Reddit discussion about the subject, where user Elmhurstlol was wondering why they needed to provide an alias to the derived table (the subselect with the UNION) in the following query: SELECT AVG(price) AS AVG_PRICE … Continue reading Should I Put That Table Alias or Not? →

#DBHangOps 06/26/14 -- PERFORMANCE_SCHEMA in MySQL 5.7 and more!

Check out the recording below!

Hello everybody!

Join in #DBHangOps this Thursday, June, 26, 2014 at 11:00am pacific (18:00 GMT), to participate in the discussion about:

• MySQL 5.7 Semi-sync replication (Morgan Tocker)

• MySQL 5.7 PERFORMANCE_SCHEMA (from Mark Leith!)

  • New instruments
  • How to use the instruments
  • Open questions!
• Any other MySQL 5.7 discussion!

Be sure to check out the #DBHangOps twitter search, the @DBHangOps twitter feed, or this blog post to get a link for the google hangout on Thursday!

See all of you on Thursday!