Relational database indexes / Write less tests!

Fri, 10 Feb 2017 19:00 - 21:30 JST


東京都渋谷区神宮前6-27-8 京セラ原宿ビル2F


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¥1,000 prepaid
Drinks and a light meal will be provided



19:00 〜 19:30 Doors open

Grab a drink and catch up with your fellow Rubyists.

19:30 〜 19:55 Developers need to know how indexes works in relational databases Hayato Matsuura

To write performant queries in relational databases, it is essential to understand how indexes work. This talk will give an overview of general principles of indexes (i.e., not tied to a specific database like MySQL or PostgresSQL), and show how you can speed up your queries.


An IT infrastructure engineer mainly interested in relational databases (especially MySQL). Currently working as a technical support engineer for a package software built on Ruby on Rails. Hobbies are creating Twitter bots and trekking. Known as @dblmkt on Twitter.

20:00 〜 20:25 (why & how we should) Write less tests! Zach Collins

Love or hate them, the creation and maintenance of tests are an engineering reality in modern software development. But as with most good things, there is such a thing as too much. Yet, what “too much tests” is, and what precisely makes it “bad” isn’t always clear. Let’s talk through the negatives of large test code bases and some strategies for “goal oriented” test development.


Software engineer working at a funny little B2B chat startup near Gotanda station. Been writing code nearly two decades, first as an unhealthy habit, and then as a means to feed his unhealthy habits. Loves unconventional wisdom, but is unfortunately not particularly wise for it.

20:30 〜 21:30 Open Networking

Discuss the presentations or anything else Ruby related with the other attendees.

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Tokyo Rubyist Meetup

Tokyo Rubyist Meetup

Tokyo Rubyist Meetup (trbmeetup) is an event that seeks to help bridge the Japan and international ruby and ruby on rails community. It will hold regular meetings where Japanese Rubyists can commun...

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