Re: auto_explain sample rate
| От | Craig Ringer |
|---|---|
| Тема | Re: auto_explain sample rate |
| Дата | |
| Msg-id | CAMsr+YFXQ+G_9MHfoRvVo83knPbcaCCS7+P+dft_qJY45cFeEQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: auto_explain sample rate (Andres Freund <andres@anarazel.de>) |
| Ответы |
Re: auto_explain sample rate
|
| Список | pgsql-hackers |
On 3 June 2015 at 20:04, Andres Freund <andres@anarazel.de> wrote:
---On 2015-06-03 18:54:24 +0800, Craig Ringer wrote:
> OK, here we go.
Hm. Wouldn't random sampling be better than what you do? If your queries
have a pattern to them (e.g. you always issue the same 10 queries in
succession), this will possibly only show a subset of the queries.
I think a formulation in fraction (i.e. a float between 0 and 1) will
also be easier to understand.
Could be, yeah. I was thinking about the cost of generating a random each time, but it's going to vanish in the noise compared to the rest of the costs in query execution.
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