So I came across an odd situation today.

I have a system that creates memory tables using the PHP  $_COOKIE['PHPSESSID'] value.

Once some work is done it then drops the table.

Two sample tables are below for my example .


@@VERSION: 5.6.19-log
CREATE TABLE `f7a7a8d3a7ba75b5eb1712864c9b27eb` (
    ->   `id` int(11) NOT NULL AUTO_INCREMENT,
    ->   PRIMARY KEY (`id`)
    -> ) ENGINE=MEMORY;

CREATE TABLE `8865e52c7e1bea515e7156f240729275` (
    ->   `id` int(11) NOT NULL AUTO_INCREMENT,
    ->   PRIMARY KEY (`id`)
    -> ) ENGINE=MEMORY;


Now some simple processing occurs on the real tables I used then like I said I dropped them.
…

Monitoring MySQL and MariaDB databases without a powerful tool like MONyog can be challenging. However, if you already use MONyog you might not be using it to it’s full potential. In this webinar, we will introduce you to the entire feature set of MONyog followed by a Q&A session.

You’ll also be delighted to know that one lucky winner gets MONyog Ultimate worth $399 for free. So, make sure you book your spot.

Date: Tuesday, July 8, 2014
Time: 10:00 am PT
Presenter: Rohit Nadhani (CEO, Webyog)
Register your spot for free

Update: Congratulations to Vandana Sharma on …

Metadata locking has been an exciting adventure for the last couple years in MySQL and MariaDB. Users and applications using only MyISAM tables are learning the joys of locking conflicts between transactions/connections.

read more

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 …