I'm running in this misconception second time in a week or so, so it is time to blog about it.
How blobs are stored in Innodb ? This depends on 3 factors. Blob size; Full row size and Innodb row format.

But before we look into how BLOBs are really stored lets see what misconception is about. A lot of people seems to think for standard ("Antelope") format first 768 bytes are stored in the row itself while rest is stored in external pages, which would make such blobs really bad. I even seen a solution to store several smaller blobs or varchar fields which are when concatenated to get the real data. This is not exactly what happens

With COMPACT and REDUNDANT row formats (used in before Innodb plugin and named "Antelope" in Innodb Plugin and XtraDB) Innodb would try to fit the whole row onto Innodb page. At least 2 rows have to fit to each page plus some page data, which makes the limit about …

This is a quick update on the O’Reilly MySQL Conference & Expo 2010, happening April 12-15 2010 in Santa Clara.

1. We’ve put up a preliminary schedule, and you can expect this to be fast moving/changing, as we confirm more talks. A tradeoff of this, is that you can now also see the sessions by track, which helps give you an overview of where the content really is.
2. If you’re attending the conference, why not promote it? We have lots of badges and banners for attendees.
3. If you’re a speaker, you sure want to fill that room up, so why not help promote the conference using the …

Merci d'avoir assisté au webinar sur la sécurité  pour les applications Web, et merci pour vos questions. Cette présentation était réservée aux membres du programme Sun Startup Essentials. Comme promis, voici une liste de liens utiles qui viennent compléter les sujets abordés pendant la présentations :

•  ZFS triple parity
• Securing Apache using SSL
• Securing MySQL in production
• Using virtualization to …

Our patches for 5.0 have attracted significant interest.  You can read about SecondLife's experience here, as well as what Flickr had to say on their blog.  The main improvements come in both performance gains and improvements to diagnostics (such as the improvements to the slow log output, and INDEX_STATISTICS).

Despite having many requests to port these patches to 5.1, we simply haven't had the bandwidth as our main focus has been on developing XtraDB and XtraBackup.  Thankfully a customer (who prefers to stay unnamed) as stood up and sponsored the work to move the patches to 5.1.

To refresh, the most interesting patches are:

• Performance patches for InnoDB ®. Although …

Are you interested in working with an outstanding development team that is creating some of the finest database technology that’s out in the analytic/data warehouse marketplace? If so, let us know because we’re hiring! We’re continuing to grow our team and are in need of the following:

Senior Developer

This position will work directly with our current engineering team in developing our database server. To be considered, you’ll need the following:

StrRead More...

Taking TOTD #121 forward, this blog explains how to create a JPA Persistence Unit for a MySQL sample database and package it as a library. This JAR file can then be easily included in other web applications.

Lets get started!

1. Configure GlassFish for using the MySQL sample database (sakila) as described in TOTD #121.
2. Add the GlassFish instance in NetBeans IDE using "Services" panel.
3. Create JPA entities using NetBeans IDE.
   1. Create a Java class library:
      
      
      
      Our ultimate goal is …

Taking TOTD #121 forward, this blog explains how to create a JPA Persistence Unit for a MySQL sample database and package it as a library. This JAR file can then be easily included in other web applications.

Lets get started!

1. Configure GlassFish for using the MySQL sample database (sakila) as described in TOTD #121.
2. Add the GlassFish instance in NetBeans IDE using "Services" panel.
3. Create JPA entities using NetBeans IDE.
   1. Create a Java class library:
      
      
      
      Our ultimate goal is …

Fosdem 2010 was my 10th fosdem Edition (including the first OSDEM)
As every year Fosdem suffered even more from it's own success.

On Friday evening ther was the obligatory Beer event... however as people need to eat to .. the Devops crowd fled the scene

I had made reservations for a 20 something group and with the CentOS crowd joining us (as there was some overlap anyhow) we were 25 when we arrived in the restaurant .

Dinner and Discussions were great .. I learned about some new projects and we had some insightfull dicussions on how fat your thin foil should be ...

After dinner we went back to the Beer Event were lots of Free Beer was tasted ...

Saturday was the first full day of Fosdem, as usual Fosdem was the victim of it's own success , too much interresting stuff to see .. too little time.

Lots of Devrooms had the "FULL" sign put up more than you want as a visitor ...
I …

Building and installing the Ruby mysql gem on freshly-installed Red Hat based systems sometimes produces the frustratingly ambiguous error below:

# gem install mysql
/usr/bin/ruby extconf.rb
checking for mysql_ssl_set()... no
checking for rb_str_set_len()... no
checking for rb_thread_start_timer()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Searching the web for info on this error yields two basic solutions:

1. Install the mysql-devel package (this provides the mysql.h file in /usr/include/mysql/).
2. Run gem install mysql -- …

Am kommenden Donnerstag, den 11.02.2010 findet wieder ein öffentlicher Vortrag im Mayflower Büro in Würzburg statt (Pleichertorstrasse 2, 97070 Würzburg, Straßenbahn und die Haltestelle Congress Centrum).
Beginn ist um 18:00 Uhr, Thema des Vortrags ist "Praktische Anwendung von MySQLDumper".

Intelligentes Backup-Management bei MySQL-Datenbanken? Kein Problem, denn mit dem MySQLDumper kann jeder Sicherungskopien seiner wichtiger Datenbestände erstellen - und bei Bedarf auch kinderleicht wieder herstellen. Daniel Schlichtholz zeigt wie MySQLDumper einem das Leben erleichtert. Frei nach dem Motto: back it up the easy way...

Die "Donnerstags-Vorträge" werden sowohl in Würzburg als auch in München gehalten. Bei Interesse einfach das Blog beobachten, um auf dem Laufenden zu bleiben!
Wir freuen uns auf viele Teilnehmer!

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