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2min chapter
Zero-downtime migrations
Postgres FM
How to Create a Check Constraint for a Transactional Table
Before post- the solar event, if you create check constraint, it cannot be done in two phases. But using some brain power, we solve the problem for post- this 11 as well. We have real values that not not now is there. So I can rely on it to the two rigid validators, to all rows. It's magic. Postgres thinks, oh, this minus one, this default is virtual. Then we backfill in batches and drop default minus one goes away. This is like very interesting. You've used what you have to achieve something like multiple things work together and you achieve something very useful.
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