Re: Lock Wait Statistics (next commitfest)

Mark Kirkwood wrote:
> Jaime Casanova wrote:
>> On Fri, Jul 17, 2009 at 3:38 AM, Mark
>> Kirkwood<markir(at)paradise(dot)net(dot)nz> wrote:
>>
>>> With respect to the sum of wait times being not very granular, yes -
>>> quite
>>> true. I was thinking it is useful to be able to answer the question
>>> 'where
>>> is my wait time being spent' - but it hides cases like the one you
>>> mention.
>>> What would you like to see? would max and min wait times be a useful
>>> addition, or are you thinking along different lines?
>>>
>>>
>>
>> track number of locks, sum of wait times, max(wait time).
>> but actually i started to think that the best is just make use of
>> log_lock_waits send the logs to csvlog and analyze there...
>>
>>
> Right - I'll look at adding max (at least) early next week.
>

I'm also thinking of taking a look at amalgamating transaction type lock
waits. This seems like a good idea because:

- individually, and viewed at a later date, I don't think they
individual detail is going to be useful
- there will be a lot of them
- I think the statistical data (count, sum elapsed, max elapsed) may be
sufficiently interesting

Cheers

Mark