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Rollback segments contention should be counted as ratio of waits to t… #15

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@agapoff agapoff commented May 10, 2016

…he total amount of gets

I believe this is incorrect to get the ratio of undo waits to total amount of waits and consider is as a rollback segment contention. There could be a situation when for some period of time there were only several undo waits and no other waits. So in this case the ratio will be 100% and the check result will be CRITICAL.

It's better to take the ratio to total amount of gets.

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