Category Archives: MariaDB

MariaDB is a widely used open source database for both OLTP and OLAP workloads. It was born as a MySQL fork, which makes it very competitive for transactional environments at scale. However, MariaDB Corporation chosen to develop features and optimisation that allows MariaDB to compete with Oracle in the analytics market.

At Vettabase we are MariaDB experts, not just MySQL professional with some knowledge of MariaDB. Here we share hints and insights about MariaDB specific features, optimisations and internals.

MariaDB/MySQL: Working with MD5 or other hashes

Posted on 17 February 2022 by Federico Razzoli — 2 Comments ↓

The optimal way to store a MD5 hashes in MariaDB, and how to work with them. Continue reading MariaDB/MySQL: Working with MD5 or other hashes→

MariaDB: The regexp + LIKE optimisation

Posted on 27 January 2022 by Federico Razzoli — No Comments ↓

MariaDB supports regular expressions, but regexps won’t use indexes. Here’s a workaround that can be used in some cases. Continue reading MariaDB: The regexp + LIKE optimisation→

MariaDB: WITH TIES syntax

Posted on 13 December 2021 by Federico Razzoli — No Comments ↓

Semantics and use cases of the WITH TIES syntax. Continue reading MariaDB: WITH TIES syntax→

How to delete duplicate rows in MariaDB

Posted on 28 November 2021 by Federico Razzoli — No Comments ↓

How to remote duplicate values from a table to add a UNIQUE index, in MariaDB. Continue reading How to delete duplicate rows in MariaDB→

How slow is SELECT * ?

Posted on 18 September 2021 by Federico Razzoli — 4 Comments ↓

The most widely known query optimisation rule is that developers should always avoid SELECT *. Even when all columns are needed, they should list their names, because more columns could be created in the future. But developers find this really Continue reading How slow is SELECT * ?→

Identify useless queries in MariaDB/MySQL

Posted on 7 September 2021 by Federico Razzoli — No Comments ↓

Some queries always fail or never return rows. They should be eliminated to improve database performance. Continue reading Identify useless queries in MariaDB/MySQL→

NULL comparisons in MariaDB, PostgreSQL, and SQLite

Posted on 6 September 2021 by Federico Razzoli — No Comments ↓

Comparisons are tricky when NULL values are involved. But some databases offer some special, handy syntax to solve the problem. Continue reading NULL comparisons in MariaDB, PostgreSQL, and SQLite→

A summary of MariaDB 10.6

Posted on 7 July 2021 by Federico Razzoli — No Comments ↓

MariaDB 10.6 is now Generally Available! Let’s see what’s new and if it’s worth an upgrade. Continue reading A summary of MariaDB 10.6→

MariaDB Ignored Indexes

Posted on 12 June 2021 by Federico Razzoli — No Comments ↓

Ignored Index are a MariaDB 10.6 feature that allows us to drop an index in production reducing the risks. Continue reading MariaDB Ignored Indexes→

Finding Duplicate Indexes and Unused Indexes in MariaDB/MySQL

Posted on 8 June 2021 by Federico Razzoli — No Comments ↓

Having many indexes in our databases comes with a cost. It is good to periodically eliminate duplicate and unused indexes. Continue reading Finding Duplicate Indexes and Unused Indexes in MariaDB/MySQL→