|Large Hadron Migrator
|6 months ago
|3 months ago
|BSD 3-clause "New" or "Revised" License
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Large Hadron Migrator
GitHub downtime root cause analysis
4 projects | /r/programming | 3 Dec 2021
No you didn't. They're doing what is often referred as "online schema change" using https://github.com/github/gh-ost (but the concept is the same than percona's pt-online-schema-change, or https://github.com/soundcloud/lhm.
Database... or Goose?
4 projects | /r/ruby | 28 Jun 2021
Is there anything similar for MySQL? There is https://github.com/soundcloud/lhm but it's pretty much outdated nowadays
Do you use migrations for data manipulations? What are the pro's and con's ?
3 projects | /r/rails | 17 Feb 2021
I may do it from the console or a task if I wanted to modify a large number of records, e.g. something in my Users table. I think you need a sense of how long the update will take - I'm not sure if there's any issue with migrations timing out or such like. If I modify my Users schema it takes 5 minutes or so as it has to make a copy of the table and swap it in and that works fine - https://github.com/soundcloud/lhm
We haven't tracked posts mentioning Seedbank yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
Seed Fu - Advanced seed data handling for Rails, combining the best practices of several methods together.
Seed dump - Rails 4/5 task to dump your data to db/seeds.rb
Squasher - Squasher - squash your old migrations in a single command
Lol DBA - lol_dba is a small package of rake tasks that scan your application models and displays a list of columns that probably should be indexed. Also, it can generate .sql migration scripts.
Upsert - Upsert on MySQL, PostgreSQL, and SQLite3. Transparently creates functions (UDF) for MySQL and PostgreSQL; on SQLite3, uses INSERT OR IGNORE.
Database Cleaner - Strategies for cleaning databases in Ruby. Can be used to ensure a clean state for testing.
Rails DB - Rails Database Viewer and SQL Query Runner
Foreigner - Adds foreign key helpers to migrations and correctly dumps foreign keys to schema.rb
BatchLoader - :zap: Powerful tool for avoiding N+1 DB or HTTP queries
PgHero - A performance dashboard for Postgres
QueryTrack - Find time-consuming database queries for ActiveRecord-based Rails Apps