Why is varchar(255) not varchar(255)?
Recently I was working on a clients question and stumbled over an issue with replication and mixed character sets. The client asked, wether it is possible to replicate data to a table on a MySQL slave,...
View ArticleHow to move InnoDB-Logfiles on a Galera Cluster
Somebody recently asked, what they had to do, if they wanted to move their InnoDB-Logfiles back to the datadir. As a challenge, the servers were part of a Galera Cluster.My first thought was: The...
View ArticleNon-standard database set up with SELinux
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...
View ArticleReset MySQL 5.7 password on macOS over the command line
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...
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Migration of SQLite to MySQL
In my first Blog ever, I am going to cover the migration of a SQLite-Database to MySQL. The Tool used is MySQL-Workbench, which you can Download from the MySQL website. In this particular case, it is...
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Replication in a star
Most of you know, that it is possible to synchronize MySQL and MariaDB servers using replication. But with the latest releases, it is also possible to use more than just two servers as a multi-master...
View ArticleDefine preferred SST donor for Galera Cluster
One of our customers recently ran into a problem, where he wanted to have a preferred donor for SST, whenever a node came up. The problem was, that the node did not come up, when the preferred donor...
View ArticleHow to become a certified DBA
I recently managed to get my certification as MySQL 5.6 DBA, and was asked to write a blog about it, because I had trouble getting the informations I needed.You may have figured out too, that Oracle...
View ArticleWhy is varchar(255) not varchar(255)?
Recently I was working on a clients question and stumbled over an issue with replication and mixed character sets. The client asked, wether it is possible to replicate data to a table on a MySQL slave,...
View ArticleHow to move InnoDB-Logfiles on a Galera Cluster
Somebody recently asked, what they had to do, if they wanted to move their InnoDB-Logfiles back to the datadir. As a challenge, the servers were part of a Galera Cluster.My first thought was: The...
View ArticleNon-standard database set up with SELinux
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...
View ArticleReset MySQL 5.7 password on macOS over the command line
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...
View Article