Storage Engine

Switching from MySQL/MyISAM to Galera Cluster requires that all tables (except those from the mysql, information_schema and performance_schema) are using the InnoDB Storage Engine.

For altering the Storage Engine of the tables we wrote a script (alter_engine.pl) long time ago already. Because we have made many of those switches recently we have extended its functionality.

New features

• Recognizes VIEW’s and does NOT try to alter their Storage Engine (bug).
• Script is MySQL version aware. Complain if …

In the old days everything was simpler. We had one maker of our favourite database management system and possibly the choice between different Storage Engines. Mostly the decision has to be taken between MyISAM and InnoDB. When you care about your data integrity you have chosen InnoDB.

Nowadays it is more complex. We have several different makers of our favourite database management system: Oracle/MySQL, Monty Program AB and Percona with their products: MySQL, MariaDB and Percona Server.

We have different …

Introduction

In his presentation about PBXT at the DOAG Conference 2010 Paul McCullagh was speaking about memory resident PBXT tables. They will be available in version 1.1 of the PBXT Storage Engine Plugin. Memory resident PBXT tables should have similar characteristics like normal MySQL MEMORY</span> tables</a>. But in addition to the MEMORY tables they are transactional and can handle BLOB</span> and TEXT attributes.

An alternative to this feature would be the MySQL dynamic heap row …

At the DOAG 2010 we found that there are already a lot of Plugins etc. for MySQL available. Therefor it will be a good time to start with a collection of Plugins, UDF’s etc. available.

Because we have done already a collection of MySQL Storage Engines earlier please look there form more information.

A little summary about the MySQL CSV table engine:

• The SQL-Demo script (930 byte) for the following article.
• The CSV converter to convert normal CSV files into a CSV format which is for MySQL acceptable.

Caution: Use on your own risk!

MySQL CSV tables (internally also called TINA tables) are driven by the MySQL CSV storage engine. This feature was added in MySQL release 4.1.4. CSV tables store data in text files using the Character-Separated-Value format.

mysql> SELECT version();
+------------+
| …

What is a Federated Table?

A Federated Table is a table which points to a table in an other MySQL database instance (mostly on an other server). It can be seen as a view to this remote database table. Other RDBMS have similar concepts for example database links.

What can I do with a Federated Table?

To show what you can do with a federated table let us assume the following constellation: Two MySQL databases on two different servers. The first one called provider (it provides the data) the second one called …

One of the big advantages of MySQL is its concept of Pluggable Storage Engines. This means you can choose the most optimal Storage Engine for your needs. This also has a disadvantage: You have to know what you are doing…

If you need some help deciding which is the right Storage Engine or even strategy for you or if you want us to make an independent and vendor neutral comparison of those Storage Engines consider our FromDual Consulting Services!

MySQL provides the following storage engines:

mysql> …

In a round-robin database (RRD) usually time-series data like network bandwidth, temperatures, CPU load etc. is stored. The data is stored in the way that system storage footprint remains constant over time. This avoids resource expensive purge jobs and reduces complexity.

MySQL does NOT yet provide this kind of storage engine. Although some people were thinking about and some prototypes exists.

Nevertheless in this paper it is shown how you can build your own RRD tables: Round-Robin Database Storage …

One of the big advantages of MySQL is its concept of pluggable Storage Engines (SE). This means you can choose the most optimal storage engine for your needs. This also has a disadvantage: You have to know what you are doing…

More details you can find here: MySQL pluggable Storage Engines (SE).