On 2013-02-27 10:19, Ryan How wrote:
This doesn't really help, but I thought the idea of MVCC is to be an optimistic lock?. So by definition it shouldn't be able to timeout as it doesn't even need to get a "lock" ? Or am I grossly misunderstanding something here? Does "FOR UPDATE" still lock a table for other "writers", it just doesn't lock it for other "readers" ?

Try reading about MVCC first.
http://en.wikipedia.org/wiki/Multiversion_concurrency_control

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