I did some drawing exercise and put XtraDB / InnoDB internals in Visio diagram:

The XtraDB differences and main parameters are marked out.

PDF version is there http://www.percona.com/docs/wiki/percona-xtradb:internals:start.

Entry posted by Vadim | 4 comments

Add to: | …

Just a quick notice to let everyone know that there is a new version of Kontrollkit available. There are some required bug fixes to the formerly new python backup script and some Solaris compatible changes to the various my.cnf files. You can download the new version here: http://kontrollsoft.com/software-downloads, or here: http://code.google.com/p/kontrollkit/

Uster, Switzerland -- April 26, 2010 -- FromDual has signed the Service Provider Partnership Agreement of the Open Database Alliance (ODBA).

FromDual is the first official ODBA consulting partner in Europe. The growing number of downloads and use of MariaDB, an improved and enhanced derivation of the MySQL database, also requires consultancy services for MariaDB in Europe.

“We are excited to be working with ODBA as their first consulting partner in Europe” says Oliver Sennhauser, Owner of FromDual. “Through our ODBA partnership, we will significantly help strengthen the position of MariaDB and ODBA in the Open Source database market.”

About FromDual

FromDual is the leading vendor independent and neutral MySQL consulting company in Europe!
As a ODBA Silver Partner, FromDual provides consultancy services for MySQL and its derivatives like MariaDB, Percona-Server, …

Uster, Switzerland -- April 26, 2010 -- FromDual has signed the Service Provider Partnership Agreement of the Open Database Alliance (ODBA).

FromDual is the first official ODBA consulting partner in Europe. The growing number of downloads and use of MariaDB, an improved and enhanced derivation of the MySQL database, also requires consultancy services for MariaDB in Europe.

“We are excited to be working with ODBA as their first consulting partner in Europe” says Oliver Sennhauser, Owner of FromDual. “Through our ODBA partnership, we will significantly help strengthen the position of MariaDB and ODBA in the Open Source database market.”

About FromDual

FromDual is the leading vendor independent and neutral MySQL consulting company in Europe!
As a ODBA Silver Partner, FromDual provides consultancy services for MySQL and its derivatives like MariaDB, Percona-Server, …

MySQL stored procedures are programs that are stored and can be executed on the MySQL server. You can call stored procedure from any application over a distributed network. Stored procedures provide a means of interacting in a prescribed way with the database without placing any additional traffic on the network. Here I’m describing a stored procedure that I used to create some sample data.

To learn more about stored procedure checkout this link.

Suppose you may need to create a large number of dataset for a table and your table structure looks like this

CREATE TABLE IF NOT EXISTS `dictionary` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `word` varchar(100) NOT NULL,
  `mean` varchar(300) NOT NULL,
  PRIMARY KEY (`id`)
);

Now you’ve to add 110000 dummy data to this table. You can dump some dummy data to the table …

The new Twenty Ten theme is now live on WordPress.com and the default for all new blogs created on the service. As an aside, WP.com (11 million sites) was switched over to 3.0 over the weekend. I love it when we’re able to do that early because we find a ton of bugs in the integration and merge, and then we have 11 million beta testers banging on the software before we do the shrink-wrap release.

I was installing the latest MySQL 5.5.4 on a new machine and I came across the following issues during installation, steps I generally perform on other versions without any incidents.

$ sudo su -
$ cd /opt
$ wget http://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.4-m3-linux2.6-x86_64.tar.gz/from/http://mysql.mirrors.hoobly.com/
$ tar xvfz mysql-5.5.4-m3-linux2.6-x86_64.tar.gz
$ cd mysql-5.5.4-m3-linux2.6-x86_64
$ scripts/mysql_install_db
Neither host 'barney' nor 'localhost' could be looked up with /usr/bin/resolveip
Please configure the 'hostname' command to return a correct hostname.
If you want to solve this at a later stage, restart this script with the --force option

Perform some checks

$ /usr/bin/resolveip
-su: /usr/bin/resolveip: No such file or directory

$ hostname
barney

$ head -2 /etc/hosts
127.0.0.1       localhost
127.0.1.1       barney

I was surprised to find that my Ubuntu 10.04 Lucid Lynx box had a …

Last week, my colleague Massimo and I discussed how to handle big result sets coming from MySQL in Python. The problem is that MySQL doesn't support server-side cursors, so you need to select everything and then read it. You can do it either buffered or not. MySQL Connector/Python defaults to non-buffered, meaning that you need to fetch all rows after issuing a SELECT statement. You can also turn on the buffering, mimicking what MySQL for Python (MySQLdb) does.

For big result sets, it's better to limit your search. You can do this using an integer primary key or some temporal field for example. Or you can use the LIMIT keyword. The latter solution is what is used in …

A lot of systems are relatively easy to make HA (highly available). You just slap them into a well-known HA framework such as Linux-HA and you’re done. But databases are different, especially replicated databases, especially replicated MySQL.

The reason has to do with some properties that hold for many systems, but not for most databases. Most systems that you want to make HA are relatively lightweight and interchangeable, with little to zero statefulness, easy to start, easy to stop, don’t care a lot about storage (or at least don’t write a lot of data; that’s usually delegated to the database), and there’s little or no harm done if you ruthlessly behead them. The classic example is a web server or even most application servers. Most of the time these things are all about CPU power and network bandwidth. If I were to compare them to a car, I’d say they are like matchbox cars: there are many of them, and they are cheap …

Some days ago I was working in a vocabulary game and dictionary. The dictionary contains 1,10,000 words and meanings. I developed a vocabulary game where I had to randomly choose 10 words out of 1,10,000 dataset. Here I’m describing the possible solutions for this problem and which solution I used.

Data table

Table name is dictionary and it has id, word and meaning fields. id contains auto incremented id and it is unbroken sequence 1,2,3…..n.