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Agenda: 18:00 Welcome 18:15 How not to sell the same ticket to two different people by Jose Muñoz (ClickHouse) 19:00 Online schema changes at Scale with TiDB by Mattias Jonsson (PingCAP) 19:45 Lightning Sessions 20:15 Pizza & networking

How not to sell the same ticket to two different people by Jose Muñoz (ClickHouse) Summary: Let’s say we build an app to sell movie theater tickets using your favorite database and framework. We design a stunning interface, pack it with amazing features, and ensure every detail of accessibility is perfect. We deploy it to production, and once users start arriving, we notice some very strange things happening: some customers have purchased the same seat for the same movie at the same time, and in some showings, people are sitting on the floor because we've sold more tickets than there are seats. What could have gone wrong?

In this talk, we’ll explore how these kinds of issues can occur when we don’t use transactions, share some real-world cases, and examine techniques modern databases use to help us avoid these problems.

Bio: Jose is a software engineer with close to nine years of experience building data-centric products at companies such as Tuenti and Tinybird. He now works at ClickHouse, where he maintains the dbt connector. Passionate about community, he has helped organize events with GDG Cáceres and Databeers Madrid and tries to share what he learns by speaking at meetups and conferences.

Online schema changes at Scale with TiDB by Mattias Jonsson (PingCAP) Summary: ALTER TABLE in production databases are tricky, this talk will go through some of the challenges, as well as how the Distributed SQL database TiDB solves the issues as well as providing high speed index addition and more.

Bio: Mattias has worked as a Principal Software Engineer at PingCAP working on TiDB, since April 2021. Previously he worked with MySQL at Booking.com and before that working on MySQL server at Oracle. So more than 20 years of Database experiences, mostly in the MySQL community.

Location: Nexthink's office - Avda. Del General Perón 40, bloque D, planta 1. 28020 Madrid (the entrance in on the opposite side of the building from the Avenida - in front of the Torre Picasso or look for the Bicai restaurant, it is next door)

Hey there, data enthusiasts and ClickHouse aficionados! We've got some exciting news to share - our next meetup is on the horizon, and it's going to be an epic data-driven shindig!

Get ready for a delightful mix of mind-boggling data tales, insightful conversations, and maybe even a surprise or two up our sleeves. But here's the deal: to secure your spot, make sure you register ASAP!

Agenda: 18:30 - Doors Open & Networking & Snacks 19.00 - 19:10 - Intro by ClickHouse Melvyn Peignon, Principal Product Manager, ClickHouse Valentin Chanmala, EMEA South Sales, ClickHouse 19.10 - 19:30 - Feedback session n°1 - Verve Javier Vidal, Software Engineer Team Lead, Verve 19.30 - 19:50 - Feedback session n°2 - Nexthink Rodrigo Garcia, Cloud Engineer, Nexthink 20:00 - 20:30 - Food & Conversation

Location: Contentsquare Office (WeWork), 7 Rue de Madrid, 75008 Paris

Hey there, data enthusiasts and ClickHouse aficionados! We've got some exciting news to share - our next meetup is on the horizon, and it's going to be an epic data-driven shindig!

Get ready for a delightful mix of mind-boggling data tales, insightful conversations, and maybe even a surprise or two up our sleeves.

But here's the deal: to secure your spot, make sure you register ASAP!

Agenda: 18:30 - Doors Open & Networking & Snacks

19.00 - 19:10 - Intro by ContentSquare Christophe Kalenzaga, Senior staff software engineer, ContentSquare

19.10 - 19:30 - Introduction to ClickHouse Melvyn Peignon, Principal Product Manager, ClickHouse Valentin Chanmala, Sales, ClickHouse

19.30 - 19:50 - Retour d'expérience - Ringover Martial Salgues, Administrateur système & DevOps, Ringover

19:50 - 20:10 - Retour d'expérience - Withings Paul Jouhaud, Data Analytics Team Lead, Withings Paul-Matthieu Riolacci, Lead Data Engineer, Withings

20:10 - 20:30 - Retour d'expérience - Rapid Delivery Analytics Andrey Dyatlov, Co-Founder, Rapid Delivery Analytics

20:30 - 21:30 - Food & Conversation