One of the students wanted an equivalent example to an Oracle DML trigger sample that replaces a white space in a last name with a dash for an INSERT statement. Apparently, the MySQL trigger example in the Oracle Database 11g and MySQL 5.6 Developer Handbook was a bit long. I have to agree with that because the MySQL DML trigger demonstrated cursors and loops in the trigger code.

Triggers can be statement- or row-level actions. Although some databases let you define statement-level triggers, MySQL doesn’t support them. MySQL only supports row-level triggers. Row-level triggers support critical or non-critical behaviors. Critical behavior means the trigger observes an insert, update, or delete that must be stopped, which means it …

This week’s Log Buffer #296 focuses on Oracle, SQL, and MySQL weblogs from across the planet. Log Buffer Editions are the manifestation of the fact that nerd bloggers from databases are not only growing but they are also producing immense volume of quality ramblings. Enjoy. Oracle: Stelios Charalambides book on SQLTXPLAIN is now announced, Carlos...

One of my favorite tools in the Percona Toolkit is pt-query-digest.  This tool is indispensable for identifying your top SQL queries, and analyzing which queries are accounting for your database load.

But the report you get from pt-query-digest is only as good as the log of queries you give it as input.  You need a large enough sample of query logs, collected over a period of time when you have representative traffic on your database.

You also need the log to include all the queries, not just those that take more than N seconds.  The reason is that some queries are individually quick, and would not be logged if you set the long_query_time configuration variable to 1 or more seconds. …

Ashisuto greatly expands support services for Enterprise users of MySQL & MariaDB open source database software

So, this is exciting news and something that my colleague Daniel Saito had been working on for years: enterprise-ready, 24/365 Japanese support for the MySQL and MariaDB databases!

read more

Yesterday at the first Swedish MySQL User Group real meeting here in Stockholm, I presented a talk on character sets, collations and stuff like that. If you read this blog, you know that I have written about this before, but the presentation I did yesterday was a fair bit more detailed. You can view the full presentation on slideshare:
 One thing I talked a lot on was collations and how they affect matters, and this has more of an impact than you think, in particular when using UTF-8. You would think that using UTF-8 most character set problems are …

PHP MySQL developers are confronted with three PHP MySQL APIs. That is confusing. Since mid 2012 the PHP manual suggests not to use the oldest and original PHP MySQL extension any more to cure the situation. Please, swap out ext/mysql in favour of either ext/mysqli or PDO_MySQL. Why to upgrade is below. Read on, if you are a PHP beginner, your PHP application is still using mysql_* functions of ext/mysql or you are a PHP trainer.

As a PHP consumer, tease your software vendors by asking whether they use the state of the art APIs! Here is a cut&paste test question to ask your vendor: do you support secure SSL connections to MySQL?

…

I am seeking the help of the community. I am working on an evaluation project about schema design in open source applications. While it’s possible for me to download the software of many popular apps, and install the software and then do a mysqldump, it takes time. Quite often there is no simple schema.sql file, but a process for creating the schema. If you are using an open source project, would you take a moment and run the following.

$ mysqldump -u[user] -p --skip-lock-tables --no-data --databases [schema]  > [schema].sql

This will only dump the table definitions, and should therefore contain nothing company specific. I have at this time:

• WordPress
• Drupal
• Mediawiki
• OS Commerce
• Joomla
• EzPublish
• PHPWiki

I am open to any projects, and it doesn’t matter if the version is not the most current, what I am seeking is …

So a couple of blogs posts have come out recently that got me curious to do a little more digging on how I might actually use "SHOW PROCESSLIST". Btw those blogs posts are:

• Monitoring Processes with Performance Schema in MySQL 5.6 by Mark 
• SHOW PROCESSLIST in MySQL 5.6 by Baron 

 So we all know how this works:

Server version: 5.6.8-rc-log MySQL Community Server (GPL)

MySQL 5.6.8 RC> show processlist\G
*************************** 1. row ***************************
Id: 20007
User: root
Host: localhost
db: test
Command: Query
Time: 0
State: …

MySQL Workbench 5.2.41 introduced the new Migration Wizard module. This module allows you to easily and quickly migrate databases from various RDBMS products to MySQL. As of Workbench 5.2.44 you can migrate databases from Microsoft SQL Server, PostgreSQL and Sybase Adaptive Server Enterprise. It also provides for generic migrations, i.e. migrations from other RDBMSes that are not explicitely supported, provided that they have a well behaved ODBC driver. More on this in an upcoming post…

Additionally, you can use the Migration Wizard to perform MySQL to MySQL database migrations, which can be used for tasks such as copying a database across servers or migrating data across different versions of MySQL.

We have already described in a previous post how to use the Migration Wizard to migrate a Microsoft SQL Server database to MySQL. In this post we are going to …

The Winter season for conferences is catching up speed.

DOAG

As I write this the DOAG conference in Germany is happening. It is one of the biggest (or the biggest?) Oracle user group conferences outside of USA. Many of my European friends in the MySQL space are talking there. As you know I have been a big fan of Galera Cluster for MySQL for over a year now, but I was perhaps a bit of an early adopter. Lo-and-behold, I was surprised to see the DOAG related press-release from SkySQL puts the creators of Galera first in their headline: Codership, SkySQL und weitere Top-Experten rund um das Thema ‘MySQL Datenbanken” in Nürnberg versammelt. Talk about crossing the chasm! Ralf Gebhardt, my other mentor …