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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.

Optimising or fixing SQL queries: how to ask for help

Optimising or fixing SQL queries: how to ask for help

If you need free help or paid support, you should phrase your questions correctly and provide the necessary information. ...
London Meetup – Open Source Communities: vendors and users working together (September 2019)

London Meetup – Open Source Communities: vendors and users working together (September 2019)

Open Source Communities: vendors and users working together. Event organised by London open source databases meetup, on 18th September. ...
Choosing Cassandra consistency levels

Choosing Cassandra consistency levels

Good practices and advice to use #Cassandra consistency levels in practice, with an eye on performance and scalability ...
READ ONLY transactions in MySQL

READ ONLY transactions in MySQL

MySQL transactions can be read only. Here's how to use them, and why they are useful. ...
Cassandra error on login: Cannot achieve consistency level LOCAL_ONE

Cassandra error on login: Cannot achieve consistency level LOCAL_ONE

Cassandra login fails with: "Cannot achieve consistency level LOCAL_ONE"? Let's see why it happens, and how to solve the problem ...