This week I learned more than I'd ever thought I'd know about transaction isolation in Postgres

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@maxdeviant that sounds actually not too bad. were you debugging something?

@metasyn I was trying to figure out how to maintain an atomic counter column.

I initially started out using Serializable isolation, but after a lot of debugging it turned out that what I actually wanted was Repeatable Read isolation.

Turns out, Serializable isolation performs page-level locking, so you can run into scenarios where concurrent updates to different rows in a table can fail if they are on the same page.

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