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I am a freelancer database consultant, specialised in MySQL and other open source databases.

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Knowledge Base

Federico-Razzoli.com articles aim to form a shared knowledge base on open source database systems. Feel free to read, contribute with comments, and share links to these contents.

MySQL stored procedures: all ways to produce an output

MySQL stored procedures: all ways to produce an output

There are many non-obvious ways to return values from MySQL stored procedures, and each of them solves particular problems. ...
Dropping useless MySQL indexes

Dropping useless MySQL indexes

How to find useless indexes and get rid of them to improve your database performance. ...
Indexes bad practices

Indexes bad practices

When creating indexes, some common mistakes should be avoided. ...
Primary Key in InnoDB: how they work and best practices

Primary Key in InnoDB: how they work and best practices

How primary key are implemented in InnoDB, and how to build fast primary keys. ...
MariaDB Stored Aggregate Functions by examples

MariaDB Stored Aggregate Functions by examples

MariaDB 10.3 supports stored aggregate functions. Let's see how to create them with examples. ...