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Schulungstermine für MySQL Kurse 2013 in Deutschland

FromDual bietet auch im Jahr 2013 wieder intensive MySQL Schulungen für fortgeschrittene MySQL Anwender an.

Folgende deutschsprachigen Kurse sind geplant:

Privileges of MySQL backup user for mysqldump

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Some MySQL customers do not want to use the root user for mysqldump backups. For this user you have to grant the following minimal MySQL privileges:

mysqldump --single-transaction (InnoDB)

CREATE USER 'backup'@'localhost' IDENTIFIED BY 'secret';

mysqldump --lock-all-tables (MyISAM)

GRANT LOCK TABLES ON *.* TO 'backup'@'localhost';

If we missed a privilege please let us know.

MySQL backup to file, gzip and load in one step

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When a MySQL Slave is set-up with mysqldump you have 2 possibilities:

MySQL Backup, HA und Performance Tuning Schulung in Essen (D)

Zusammen mit dem Linux Hotel bieten wir jetzt auch in Essen MySQL Kurse an. Der erste Kurs findet noch dieses Jahr im Dezember statt:

To zip, or not to zip, that is the question

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Abstract: In this article we have a look at the compression options of common zipping tools and its impact on the size of the compressed files and the compression time. Further we look at the new parallel zip tools which make use of several cores.

MySQL Restore and Recovery methods


Backup is for sissies! Let's have a look what we can do when we are not a sissy...

First of all: Your life is much easier when you have a proper backup process implemented and verified the restore procedure of your MySQL database.

But what if you have no backup in place and did a DROP TABLE. What shall we do?

We assume our data we just dropped are located on the following device:

DBA wisdoms


Controlling developers is like herding cats.
Kevin Loney, Oracle DBA Handbook

Oh no, it's not. It's much harder than that!
Bruce Pihlamae, long-term Oracle DBA

Do not assume!
Unknown IT specialist

Backups ist was für Warmduscher!
(engl. Backup is for sissies!)
Unkown DBA

Yesterday (the DBA version)

All those backups seemed a waste of pay.
Now my database has gone away.
Oh I believe in yesterday.

Can you trust your MySQL backup?

Today a customer with corrupted data files showed up. When we enquired a bit more he told us that he had a broken I/O controller. This is one of the worst things which can happen to you!

The reason is the following: When a I/O controller starts to die it often does not happen immediately. The controller dies slowly producing more and more corrupt data. When you just write data without checking or reading them it can take days or even weeks until you discover the problem.

MySQL Cluster restore

Recently the question came up if it is faster to restore a MySQL cluster when all nodes are up or only ONE node from each node group during restore.

The answer from our gurus was: All nodes up during restore! I wanted to find out why. So I set up the following cluster and started to measure:

MySQL Cluster set up

Cluster set-up

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