Josh Berkus <josh@agliodbs.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