22: Running migrations in production with Patryk Bąk
Thinking Elixir Podcast
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Migrating Data
The idea of not using our elixir code, the structs and things that are modeling the data in our application during migrations. When you deploy changes to the production and the system starts up, the new migration is run in a transaction. It means that until the whole process of migrating data is finished, the changes entered by the migration are not visible by the system. What if the table which migration updates contains thousands of records or even more? Then it can take several minutes, sometimes hours, and during that time, for instance users won't be able to register themselves.
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