On Thu, Aug 30, 2012 at 3:48 PM, Tomas Vondra <t...@fuzzy.cz> wrote: > That sounds like a pretty trivial patch. I've been thinking about yet > another option - histograms (regular or with exponential bins).
I thought about that, too, but I think high-outliers is a lot more useful. At least for the kinds of things I worry about. > What I'm not sure about is which of these options should be allowed at the > same time - to me, combinations like 'sampling + aggregation' don't make > much sense. Maybe except 'latency-only-if-more-than + aggregation'. Maybe, but perhaps not even. I don't have a problem with saying that the user is allowed to pick at most one method of reducing the output volume. I think we could say: either sample, or take high outliers, or aggregate. If we want to make some of those work in combination, fine, but I don't think it's absolutely required. What WILL be required is a clear error message telling you what you did wrong if you use an unsupported combination. BTW, I think that using any of these options should automatically enable -l, rather than requiring it to be specified separately. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers