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Changing your huge table's data types in production

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You have a huge table, and it is necessary to change a column's data type, but your database has to keep running with no downtime. What do you do?
Here's one way to perform this change, in as unobtrusive a manner as possible while your table keeps serving users, by avoiding long DDL table locks and leveraging procedural transaction control.

Talk from the PostgreSQL devroom at FOSDEM 2021

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