On Fri, Jun 10, 2011 at 9:58 PM, Josh Berkus
<josh@agliodbs.com> wrote:
It's not 10%. We use a fixed sample size, which is configurable on the
system, table, or column basis.
It seems that you are referring to "alter column set statistics" and "default_statistics_target", which are the number of percentiles in the histogram (and MCV's) .
I mean the number of records that are scanned by analyze to come to the statistics for the planner, especially n_disctict.
On Fri, Jun 10, 2011 at 10:06 PM, Nathan Boley
<npboley@gmail.com> wrote:
If you need to fix ndistinct, a better approach may be to do it manually.
That would be nice, but how do i prevent the analyzer to overwrite n_distinct without blocking the generation of new histogram values etc for that column?
We use version 8.4 at the moment (on debian squeeze).
Cheers,
WBL
--
"Patriotism is the conviction that your country is superior to all others because you were born in it." -- George Bernard Shaw
