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.

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→

The risks of replication filters in MariaDB and MySQL

Posted on 23 April 2021 by Federico Razzoli — No Comments ↓

MariaDB/MySQL replication filters may be useful, but they come with some risks that Database Administrators should be aware of. Continue reading The risks of replication filters in MariaDB and MySQL→

Vettabase is now a MariaDB Foundation Technology Partner

Posted on 24 February 2021 by Federico Razzoli — No Comments ↓

Vettabase is a MariaDB Foundation partner. We contributed documentation about automating MariaDB deployments and configuration management. Continue reading Vettabase is now a MariaDB Foundation Technology Partner→

Sizing Aria Pagecache

Posted on 18 February 2021 by Federico Razzoli — No Comments ↓

Aria pagecache is used to cache frequently read index blocks, reducing the accesses to disks. Let’s see how to check if its size is adequate. Continue reading Sizing Aria Pagecache→