Table on FromDual GmbH

Dropped Tables with FromDual Backup Manager

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 24 May 2019 07:23:55 +0000

Some applications have the bad behaviour to CREATE or DROP tables while our FromDual Backup Manager (bman) backup is running.

To NULL, or not to NULL, that is the question!

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 14 Dec 2018 08:33:25 +0000

As we already stated in earlier articles in this blog
[1 and 2
] it is a good idea to use NULL values properly in MariaDB and MySQL.

Get rid of wrongly deleted InnoDB tables

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 22 Oct 2014 22:10:58 +0000

Precaution: Before you try this out on your production system do a BACKUP first! FromDual Backup Manager can help you with this.

Troubles with MySQL 5.5 on FreeBSD 9

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 29 Mar 2012 11:55:05 +0000

FreeBSD 9 seems to have some troubles with MySQL 5.5.20. A customer has moved from MySQL 5.0 on Linux to MySQL 5.5 on FreeBSD 9. He experienced a lot of periodic slow downs on the new, much stronger, system which he has not seen on the old Linux box.

How MySQL behaves with many schemata, tables and partitions

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 30 Nov 2011 15:35:28 +0000

Introduction

Recently a customer claimed that his queries were slow some times and sometimes they were fast.

Using NULL as default values

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 21 Jul 2011 18:35:34 +0000

Abstract:

It is common practice in MySQL table design that fields are declared as NOT NULL but some non-sense DEFAULT values are specified for unknown field contents. In this article we show why this behavior is non optimal an why you should better declare a field to allow NULL values and use NULL values instead of some dummy values.

When a MySQL table was last touched

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 02 Jun 2011 20:56:29 +0000

In our last customer project we had around 600 Gbyte of data in a MySQL database. Because this database consumed a significant amount of our disk space and backups with the InnoDB backup tool took pretty long we wanted to find out if we could get rid of some of the tables.

Stealthy migrating MySQL tables and MySQL data access interfaces using enlarged updateable VIEW functionality

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 03 Oct 2006 22:18:00 +0000

Applications occasionally require redesign. However, redesigning an application cannot be done in one step because the application is distributed or several versions of applications must be supported. MySQL 5.0 provides the necessary means to stealthy migrate your data. In a short overview let’s look at what we plan to do: Stealthy Migration (PDF 98.7 kByte).