In a database Undo, in spite of the name, is the act of applying a transaction l... | Hacker News

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edge17 on May 10, 2018 | parent | context | favorite | on: Amazon Aurora Backtrack

In a database Undo, in spite of the name, is the act of applying a transaction log to return to a particular state. I used to work on databases earlier in my career, so selling this as a new invention seems somewhat bizarre to me.

delta-v on May 11, 2018 [–]

That's not what Aurora is doing. What you have described is more like "git revert". It's O(num of transcation in the undo log).

Aurora is a log structured db, they can just reset their DB to a particular LSN. i.e. doing "git reset --hard", which's O(1).

awgupta on May 16, 2018 | [–]

that's correct.

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