Sidegrade on FromDual GmbH

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.

What are the differences between MySQL Community and MySQL Enterprise Server 5.7

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 25 Oct 2016 22:26:55 +0000

The MySQL Server itself

The differences between the MySQL Community Server and the MySQL Enterprise Server 5.7 are as follows as claimed by Oracle:

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

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.

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).

MariaDB and MySQL Upgrade Problems

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 08 Sep 2011 20:09:25 +0200

Reasons to Upgrade MariaDB or MySQL
How to Upgrade MariaDB or MySQL
MariaDB and MySQL Reserved Keywords
MariaDB and MySQL Upgrade Problems we hit in real life
Migration between MySQL, MariaDB and Percona Server
Migration from MyISAM to InnoDB
Migration from MyISAM to Aria
Switching from Statement Based Replication (SBR) to Row Based Replication (RBR)
Switching from non-partitioned to partitioned tables
Switching from MariaDB or MySQL to Galera
Convert from latin1 Character Set to utf8mb4 Character Set

Downgrading MariaDB and Downgrading MySQL (for 5.7 and older).

Sidegrade on FromDual GmbH

Migration from MySQL 5.7 to MariaDB 10.4

MySQL - MariaDB migration

Table of Contents

What are the differences between MySQL Community and MySQL Enterprise Server 5.7

The MySQL Server itself

Differences between MySQL and MariaDB

Other sources

Migration between MySQL/Percona Server and MariaDB

MySQL single query performance - the truth!

MySQL single query performance - the truth!

MariaDB and MySQL Upgrade Problems

Table of Contents