Mysql on FromDual GmbH

MariaDB or MySQL, that is the question

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 26 Mar 2021 16:23:32 +0000

Many customers come to us and ask us whether to use MariaDB or MySQL. The answer is not so simple. FromDual is a neutral and vendor independent MariaDB/MySQL consulting company. So we should not have (in the meaning of neutral) a clear preference. For us internally we have chosen our strategy according to some clearly defined criteria. But what we have chosen for us is not necessarily the right choice for you.

Databases are standardized but in detail they behave different

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 10 Feb 2021 11:47:20 +0000

For a fancy application we want to query a chunk of rows from a table and therefore we need the minimum and the maximum of the Primary Key of these rows.
Because InnoDB is an Index Organized Table or Index Clustered Table we know that this access will use the Primary Key. But to be sure and to be compliant with the standard (and compatible) we use and ORDER BY on the Primary Key.

Shutdown with MySQL 8

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 01 Apr 2020 16:52:48 +0000

On StackExchange for Database Administrators I recently have seen a question which attracted my interest.

Migration from MySQL 5.7 to MariaDB 10.4

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 30 Nov 2019 14:17:48 +0000

Up to version 5.5 MariaDB and MySQL can be considered as “the same” databases. The official wording at those times was “drop-in-replacement”. But now we are a few years later and times and features changed. Also the official wording has slightly changed to just “compatible”.
FromDual recommends that you consider MariaDB 10.3 and MySQL 8.0 as completely different database products (with some common roots) nowadays. Thus you should work and act accordingly.

MySQL - MariaDB migration

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 07 Apr 2019 21:37:32 +0000

More and more MySQL users want to switch from MySQL/Percona Server to MariaDB over time or, more rarely, the other way around. This is mostly caused by the change of the default in the Linux Distributions (RHEL/CentOS 7, SLES 12, Debian 8) to MariaDB.
Up to MySQL/MariaDB 5.5 everything was quite easy, both Branches claim to be a drop-in replacement of each other. But after the separation into different forks (MariaDB 10.0 ff. vs. MySQL 5.6 ff.) we expect more and more problems migrating from one branch to the other what we call sidegrade.
Percona Server code is genetically closer to MySQL than MariaDB. So we expect to see less problems on this sidegrade.

MariaDB and MySQL consulting by plane

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 01 Mar 2019 15:27:06 +0000

Since January 2019 FromDual tries to contribute actively a little bit against global warming too.

Upgrade MySQL 5.7 to MySQL 8.0

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 05 Feb 2019 14:30:52 +0000

Early adopters of our customers are considering to upgrade to MySQL 8.0. To be prepared we have created a check-list:

Advanced MySQL Enterprise Training by FromDual

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 06 Feb 2018 15:29:05 +0000

Due to the increasing demand FromDual has developed an Advanced MySQL Enterprise Training for DBAs and DevOps. After testing this training extensively with some selected customers last year we offer this MySQL Enterprise Training in 2018 for a broader audience.

Oracle releases MySQL security vulnerability fixes 2018-01

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 17 Jan 2018 11:27:28 +0000

As in every quarter of the year Oracle has released yesterday its recommendation for the MySQL security updates. This is called, in Oracle terminology, Critical Patch Update (CPU) Advisory.

First Docker steps with MySQL and MariaDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 24 Nov 2017 23:05:22 +0000

The Docker version of the distributions are often quite old. On Ubuntu 16.04 for example:

Reset MySQL 5.7 password on macOS over the command line

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 09 Jan 2017 13:17:57 +0000

This one is for all MySQL-DBA’s, which are working on macOS. Since the Apple OS has a rather peculiar way of starting and stopping MySQL, compared to Linux, you can run into some issues. These problems occur especially, if you have no access to the GUI.

Non-standard database set up with SELinux

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 13 Dec 2016 15:26:19 +0000

What is SELinux?

The Security-Enhanced Linux is an extension to the Linux Kernel, made by the NSA (National Security Agency). It implements Mandatory Access Controls (MAC), which allow an administrator to define, how applications and users can access resources on a system.

MySQL and MariaDB variables inflation

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 12 Dec 2016 21:43:42 +0000

MySQL is well known and widely spread because of its philosophy of Keep it Simple (KISS).

New Features in MySQL and MariaDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 22 Nov 2016 15:45:48 +0000

As you probably know MySQL is an Open Source product licensed under the GPL v2. The GPL grants you the right to not just read and understand the code of the product but also to use, modify AND redistribute the code as long as you follow the GPL rules.

How to build your own RPM repository for MySQL Enterprise Server 5.7 on RHEL 7

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 24 Oct 2016 23:01:26 +0000

Prepare the RPM repository server

Install the software to create a RPM repository server (on an Ubuntu web server):

How to Install MySQL Enterprise Server 5.7 on Red Hat Enterprise Linux 7

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 24 Oct 2016 22:03:42 +0000

If you have already Red Hat Enterprise Linux 7 (RHEL 7) or CentOS 7 in use you probably found out, that it is not that easy to install MySQL Enterprise Server because there are already pre-installed MariaDB 5.5 libraries:

Differences between MySQL and MariaDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 22 Apr 2016 08:45:05 +0000

max_user_connections Can be changed online in MySQL. Cannot be changed in MariaDB if value was set to 0.
PERFORMANCE_SCHEMA is enabled in MySQL 5.6 and 5.7 by default. In MariaDB disabled by default.
Replication incompatibilities from MariaDB (Master) to MySQL (Slave)
MariaDB 10.2.0 still contains XtraDB 5.6. So MySQL 5.7 features cannot be used.
MariaDB 10.2 Window Functions are missing in MySQL 5.7
SHOW PROCESSLIST has additional column Progress in MariaDB.
Progress indication in: mysqldump --progress-reports (default on) for MariaDB.
MariaDB 10.0 on CentOS 7 uses still SysV init script. MySQL 5.6 on CentOS 7 uses SystemD init script.
binlog_row_image is implemented in MySQL 5.6 and does not exist in MariaDB 10.0.
MariaDB 10.1 and older (containing XtraDB 5.6) does not provide flexible/general tablespaces yet which where introduced by MySQL 5.7.
EXPLAIN FOR CONNCECTION does exist in MySQL 5.7 and does not exist in MariaDB 10.1 or 10.2.

Other sources

FromDual Nagios and Icinga plugins v1.0.1 for MySQL/MariaDB released

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 23 Feb 2016 18:27:03 +0000

FromDual has the pleasure to announce the release of the new version 1.0.1 of the FromDual Nagios and Icinga plugins for MySQL, Galera Cluster and MariaDB.

MariaDB and MySQL developer training

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:48:44 +0000

You are already a database application developer or on the way there. Now you would like to learn more about, what MySQL and MariaDB features are available which you can use later to build even better applications, to develop more efficiently applications and shorten your time to market.

MariaDB, Galera and MySQL training class schedule

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:39:58 +0000

We offer our MySQL and MariaDB trainings together with well-respected training organizations: The Linuxhotel in Essen (Germany), the Heinlein Academy in Berlin (Germany) and GFU Cyrus AG in Cologne (Germany). Our own MySQL and MariaDB training classes are hold in the building of the HSO in Zürich (Switzerland).

MariaDB, Galera und MySQL training modules

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:36:34 +0000

FromDual offers different MySQL, Galera Cluster and MariaDB training modules. For training dates see our MySQL and MariaDB training class schedule.

Download Performance Monitor

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 07 Aug 2015 15:41:50 +0000

FromDual Performance Monitor for MySQL and MariaDB including MaaS

The FromDual Performance Monitor for MySQL, Galera Cluster, MariaDB and Percona Server is a Monitoring solution based on Zabbix. Its various alerts, advisors and graphs help you to monitor and operate your MySQL databases. This solution is also available as Monitoring as a Service solution if you want to avoid the hassle of installing your own monitoring solution.

Migration from other databases to MySQL or MariaDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 03 Jul 2015 08:32:31 +0000

Database migration tools

A generic database migration tool to MySQL and MariaDB is the MySQL Workbench.

Nagios and Icinga plugins for MySQL/MariaDB released

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 04 Mar 2015 13:03:58 +0000

FromDual is pleased to announce the release of a new version 1.0.0 of the Nagios and Icinga plugins for MySQL, MariaDB, Percona Server and Galera Cluster.

Impacts of max_allowed_packet size problems on your MySQL database

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 18 Jan 2015 11:18:46 +0000

We recently run into some troubles with max_allowed_packet size problems during backups with the FromDual Backup/Recovery Manager and thus I investigated a bit more in the symptoms of such problems.

Migration between MySQL/Percona Server and MariaDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 08 Oct 2014 21:40:16 +0000

This week, we did some migrations from MariaDB 10.0 to Percona Server 5.6 at the IT department of a big German bank.

Comparing MySQL, MariaDB and Percona Server

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 29 Sep 2014 09:22:08 +0000

	MySQL	Percona	MariaDB
Company	Oracle Corp. (former MySQL AB)	Percona LLC	MariaDB Corp. (former SkySQL)
FromDual support
GA versions	5.5, 5.6	5.5, 5.6	5.5, 10.0
Galera Cluster	supported	supported	supported
License	GPL, commercial (OEM!)	GPL	GPL, LGPL, BSD
Ancestry	Mother of all	Branch of actual release	Fork of MySQL 5.5
Storage Engines	Archive, Blackhole, CSV, Federated (disabled), InnoDB (default), Memory, MyISAM	Archive, Blackhole, CSV, Federated (disabled), InnoDB (default), Memory, MyISAM, TokuDB	Archive, Aria (crash-safe MyISAM), Blackhole, Cassandra, CSV, FederatedX, InnoDB (default), Memory, MyISAM, OQGraph (Graph-SE), TokuDB
Storage Engine enforcement		yes
Fulltext search	MyISAM: yes InnoDB: yes	MyISAM: yes InnoDB: yes	MyISAM: yes Aria: yes InnoDB: yes, Sphinx-SE
Partitions	available	available	available
Plugins	Auth, Auth Socket, MemcacheD, SemiSync Repl	Auth PAM, Auth Socket, Handlersocket, MemcacheD, SemiSync Repl	Auth PAM, Auch Socket, Connect SE, Handlersocket, Sequence, Sphinx, Spider, QueryCache Info, SemiSync Repl
MemcacheD	available
virtual Columns	Since 5.7.6		since 5.2
Performance
General	All 3 branches/forks have roughly the same performance. They mostly distinguish in features not in performance.
`PERFORMANCE_SCHEMA`	enabled (5.6)	enabled (5.6), userstats	enabled (10.0)
Thread Pool	5.5, commercial plugin	5.5 and 5.6	5.1 - 5.3 (old), 5.5 (new)
`DML EXPLAIN`	5.6	5.6?
JSON `EXPLAIN`	5.6	5.6?
Optimizer Trace	5.6	5.6?
Table elimination			available
Security
Roles			since 10.0.5
Password expiration	since 5.6	since 5.6	since 10.0?
Password validation	Plugin since 5.6.6	Plugin since 5.6	Worklog, comes in 10.1/10.2
Password complexity	commercial?
PAM Authentication	MySQL 5.5, commercial plugin	since 5.5	since 5.2
Backup	mysqldump, mysqlbackup	mysqldump, XtraBackup	mysqldump, XtraBackup
Audit Plugin	5.5 a, b MyAfee Audit Plugin	5.5 and 5.6 MyAfee Audit Plugin	5.5 MyAfee Audit Plugin
Slow Query Log	available	available, improved	available
Replication
Master/Slave
multi-Source Replication	MySQL 5.7-labs	unknown	MariaDB 10.0
parallel Replication	MySQL 5.6 (per Schema)	Percona 5.6 (per Schema)	MariaDB 10.0 (per Instance!)
GTID	MySQL style	MySQL style	MariaDB style (incompatibility!)
	MySQL	Percona	MariaDB

MySQL and MariaDB support subscription

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 23 Dec 2013 15:40:51 +0000

Will you be at a loss having a MySQL or MariaDB database problem? Will you need urgently help from experienced FromDual staff when your production MySQL or MariaDB database stops working? Or do you need a third party opinion for one of your MySQL or MariaDB solutions?

What are the costs of one hour MySQL downtime?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 17 Dec 2013 14:59:10 +0000

Hello,

there are companies which earn tens of thousands of Euros per hour with their MySQL databases. Other companies operate their ERP system on MySQL, to which 1000 employees are attached to. Is the database down 1000 people are not working any more until the system is working again! Downtime costs starting at EUR 30'000.- per hour upwards.

MySQL single query performance - the truth!

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 13 Dec 2013 17:33:44 +0000

MySQL single query performance - the truth!

As suggested by morgo I did a little test for the same query and the same data-set mentioned in Impact of column types on MySQL JOIN performance but looking into an other dimension: the time (aka MySQL versions).

Impact of column types on MySQL JOIN performance

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 11 Dec 2013 20:12:40 +0000

In our MySQL trainings and consulting engagements we tell our customers always to use the smallest possible data type to get better query performance. Especially for the JOIN columns. This advice is supported as well by the MySQL documentation in the chapter Optimizing Data Types:

MySQL and MariaDB Security

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 18 Jan 2013 09:27:09 +0000

Overview

MySQL Security Products

Database Firewall: GreenSQL
MySQL Database Security: McAfee

Useful Security Links

STIG Update: DISA releases the MariaDB Enterprise 10.x Security Technical Implementation Guide
OWASP: Database Security Cheat Sheet
CIS MySQL 4.1/5.0/5.1 Benchmark (v1.0.2)
CIS Oracle MySQL Community Server 5.6 Benchmark (v1.1.0)
CIS Oracle MySQL Community Server 5.7 Benchmark (v1.0.0)
CIS Oracle MySQL Enterprise Edition 5.6 Benchmark (v1.1.0)
CIS Oracle MySQL Enterprise Edition 5.7 Benchmark (v1.0.0)
MySQL Documentation: Security
BSI certified database servers
CVE Details
RHSA-2013:0121-1
RHSA-2012:1462-1
full-disclosure@lists.grok.org.uk
MySQL Security Forum
MySQL SQL Injection Cheat Sheet

Security Vulnerabilities Fixed in MariaDB

Oracle Critical Patch Update (CPU) Advisory for MySQL

Oracle Critical Patch Update Advisory - Overview
Oracle Critical Patch Update Advisory - October 2024 (45 fixes / 9.1 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2024 (37 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2024 (36 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2024 (40 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2023 (37 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2023 (24 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2023 (34 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2023 (37 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2022 (37 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2022 (34 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2022 (43 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2022 (78 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2021 (66 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2021 (41 fixes / 8.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2021 (49 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2021 (43 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2020 (53 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2020 (40 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2020 (45 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2020 (19 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2019 (34 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2019 (45 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2019 (45 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2019 (30 fixes / 9.1 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2018 (38 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2018 (31 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2018 (33 fixes / 7.7 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2018 (25 fixes / 8.1 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2017 (25 fixes / 8.8 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2017 (30 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2017 (39 fixes / 10.0 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2017 (27 fixes / 8.8 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2016 (31 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2016 (22 fixes / 8.1 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2016 (31 fixes / 9.8 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2016 (22 fixes / 7.2 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2015 (30 fixes / 9.0 max score), verbose text form
Oracle Critical Patch Update Advisory - July 2015 (18 fixes / 6.5 max score), verbose text form
Oracle Critical Patch Update Advisory - April 2015 (26 fixes / 10.0 max score), verbose text form
Oracle Critical Patch Update Advisory - January 2015 (9 fixes / 7.5 max score), verbose text form
Oracle Critical Patch Update Advisory - October 2014 (24 fixes / 8.0 max score)
Oracle Critical Patch Update Advisory - July 2014 (10 fixes / 6.5 max score)
Oracle Critical Patch Update Advisory - April 2014 (14 fixes / 6.5 max score)
Oracle Critical Patch Update Advisory - January 2014 (18 fixes / 10.0 max score)
Oracle Critical Patch Update Advisory - October 2013 (8 fixes / 8.5 max score)
Oracle Critical Patch Update Advisory - July 2013 (18 fixes / 6.8 max score)
Oracle Critical Patch Update Advisory - April 2013 (25 fixes / 6.8 max score)
Oracle Critical Patch Update Advisory - January 2013 (18 fixes / 9.0 max score)
Oracle Critical Patch Update Advisory - October 2012 (15 fixes / 9.0 max score)
Oracle Critical Patch Update Advisory - July 2012 (6 fixes / 6.8 max score)
Oracle Critical Patch Update Advisory - April 2012 (6 fixes / 6.8 max score)
Oracle Critical Patch Update Advisory - January 2012 (27 fixes / 5.5 max score)

RedHat/CentOS vulnerabilities by CVE name

Red Hat vulnerabilities by CVE name for MySQL

DOAG SIG MySQL - Replication: September 4, 2012 in Hamburg

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 30 Jul 2012 15:11:17 +0000

On Tuesday, September 4, 2012 the next DOAG SIG MySQL meeting will take place in Hamburg (Germany) with the topic Replication.

MySQL @ FrOSCon 7 in St. Augustin (Germany)

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 01 Jun 2012 16:21:11 +0000

Also this year we will have a special track for MySQL, Galera, Percona und MariaDB at the FrOSCon in St. Augustin in Germany. The conference is scheduled for August 25 and 26 2012.

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.

Codership partners with FromDual to offer consulting and support services for Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 19 Feb 2012 09:56:45 +0000

Helsinki, Finland, Uster, Switzerland – February 18, 2012 – Codership, the provider of Galera Cluster for MySQL, and FromDual, a MySQL consulting company, today announced collaboration to offer Galera Cluster technology and related support and consulting services for Galera users all over the world, especially in German speaking countries Germany, Austria and Switzerland (DACH). Galera Cluster is a synchronous, true multi-master replication cluster for MySQL using the well known InnoDB storage engine. Customers can deploy Galera Cluster locally in LAN environments, as geo-clusters over the WAN or as virtual cluster in the cloud.

MaaS Key Request

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 18 Jan 2012 17:26:37 +0000

' . 'ERROR: Internal error. File does not exist.' . '

Example 1

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 09 Dec 2011 10:07:51 +0000

CREATE TABLE `order` (
 id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY
, name VARCHAR(64) NOT NULL
) ENGINE = InnoDB;

INSERT INTO `order` VALUES
 (NULL, 'Test order 1')
, (NULL, 'Test order 2')
, (NULL, 'Test order 3');


CREATE TABLE pos (
 id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY
, order_id INT UNSIGNED NOT NULL
, name VARCHAR(64) NOT NULL
, amount SMALLINT NOT NULL
, price DECIMAL (6,2) NOT NULL
, status TINYINT NULL
) ENGINE = InnoDB;

INSERT INTO pos VALUES
 (null, 1, 'Schrauben', 50, 0.10, 0)
, (null, 1, 'Muttern', 50, 0.10, 0)
, (null, 2, 'Nägel', 1000, 0.05, 1);


CREATE TABLE pos_shadow LIKE pos;
ALTER TABLE pos_shadow ENGINE = MEMORY;
INSERT INTO pos_shadow SELECT * FROM pos;

delimiter //

CREATE TRIGGER upd BEFORE UPDATE ON pos
FOR EACH ROW
BEGIN
 UPDATE pos_shadow AS p
 JOIN `order` AS o ON o.id = p.order_id and o.id = NEW.order_id
 SET status = 1
 WHERE o.id = 1;
END;
//

delimiter ;

SELECT o.name, p.name, p.amount, p.price, (p.amount*p.price) AS total, p. status
 FROM `order` AS o
 JOIN pos_shadow AS p ON p.order_id = o.id
;

UPDATE pos AS p
 JOIN `order` AS o ON o.id = p.order_id AND o.id = 1
 SET p.status = 1, p.order_id = 1
 where o.id = 1;

SELECT o.name, p.name, p.amount, p.price, (p.amount*p.price) AS total, p. status
 FROM `order` AS o
 JOIN pos AS p on p.order_id = o.id
;

Migrating from MySQL Master-Master Replication to Galera Multi-Master Replication

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 02 Dec 2011 14:48:58 +0000

Introduction

Galera is a synchronous Multi-Master Replication for MySQL. It is therefore in competition with several other MySQL architectures:

MySQL Vala Program Example

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 08 Sep 2011 13:28:10 +0000

Summary: In this article we have a short look at a simple MySQL example program written in Vala.

Advanced MySQL DBA Workshop

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 18 Aug 2011 12:42:57 +0000

With a partner we are planning and Advanced MySQL DBA workshop. As the name says it should be a workshop. Its planned duration is 2 days. So within 2 days we can cover 4 to 8 topics more deeply. Requirements: VirtualBox, VMware, own Laptop?

How good is MySQL INSERT TRIGGER performance

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 03 Aug 2011 17:08:36 +0000

Abstract: In this article we discuss how big is the performance impact of MySQL TRIGGERs compared to application side logging (with INSERT) into a MySQL table.

Mysql on FromDual GmbH

MariaDB or MySQL, that is the question

Databases are standardized but in detail they behave different

Shutdown with MySQL 8

Migration from MySQL 5.7 to MariaDB 10.4

MySQL - MariaDB migration

Table of Contents

MariaDB and MySQL consulting by plane

Upgrade MySQL 5.7 to MySQL 8.0

Advanced MySQL Enterprise Training by FromDual

Oracle releases MySQL security vulnerability fixes 2018-01

First Docker steps with MySQL and MariaDB

Reset MySQL 5.7 password on macOS over the command line

Non-standard database set up with SELinux

What is SELinux?

MySQL and MariaDB variables inflation

New Features in MySQL and MariaDB

How to build your own RPM repository for MySQL Enterprise Server 5.7 on RHEL 7

Prepare the RPM repository server

How to Install MySQL Enterprise Server 5.7 on Red Hat Enterprise Linux 7

Differences between MySQL and MariaDB

Other sources

FromDual Nagios and Icinga plugins v1.0.1 for MySQL/MariaDB released

MariaDB and MySQL developer training

MariaDB, Galera and MySQL training class schedule

MariaDB, Galera und MySQL training modules

Download Performance Monitor

FromDual Performance Monitor for MySQL and MariaDB including MaaS

Migration from other databases to MySQL or MariaDB

Database migration tools

Nagios and Icinga plugins for MySQL/MariaDB released

Impacts of max_allowed_packet size problems on your MySQL database

Migration between MySQL/Percona Server and MariaDB

Comparing MySQL, MariaDB and Percona Server

MySQL and MariaDB support subscription

What are the costs of one hour MySQL downtime?

MySQL single query performance - the truth!

MySQL single query performance - the truth!

Impact of column types on MySQL JOIN performance

MySQL and MariaDB Security

Overview

MySQL Security Products

Useful Security Links

Security Vulnerabilities Fixed in MariaDB

Oracle Critical Patch Update (CPU) Advisory for MySQL

RedHat/CentOS vulnerabilities by CVE name

DOAG SIG MySQL - Replication: September 4, 2012 in Hamburg

MySQL @ FrOSCon 7 in St. Augustin (Germany)

Troubles with MySQL 5.5 on FreeBSD 9

Codership partners with FromDual to offer consulting and support services for Galera Cluster for MySQL

MaaS Key Request

Example 1

Migrating from MySQL Master-Master Replication to Galera Multi-Master Replication

Introduction

MySQL Vala Program Example

Advanced MySQL DBA Workshop

How good is MySQL INSERT TRIGGER performance