What happens if you kill a long-running alter query?

Posted by B T on Stack Overflow See other posts from Stack Overflow or by B T
Published on 2010-04-28T17:47:54Z Indexed on 2010/04/28 19:57 UTC
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mysql

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kill

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query

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alter

What happens if you kill a long-running alter query? Will the alter query simply revert? How long could that take (as a proportion of the time it has already been running)?

What if that query is being replicated onto another server? Will killing the process on the other server revert the original server's alter query?

We're running mysql

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