Re: raising the default default_statistics_target

Josh Berkus <josh(at)agliodbs(dot)com> writes:
> It is. I've found that "problem" queries, especially those caused by real,
> uneven distribution of data, require raising statistics to 150-400 in order
> to fix. This is much to high a level to assign as a default.

That's basically what's bothering me about the suggestion to increase to
25 --- I'm dubious that it will do any good.

> Further, in 7.5 we'll be introducing correlated stats for multi-column indexes
> (unless something's gone off with that?)

News to me. It's certainly not there now.

> This will then give indexed columns "automatically" a somewhat higher
> level of stats analysis than other columns.

That is potentially a good idea. There's still the question of what is
a reasonable default, though.

regards, tom lane