Seum-Lim Gan <slgan@lucent.com> writes:
> We did a few (like 5 to 8 times) vacuum analyze <tablename> (no full), the
> pg_statistics relfilenode grew.
Well, sure. ANALYZE puts new rows into pg_statistic, and obsoletes old
ones. You need to vacuum pg_statistic every so often (not to mention
the other system catalogs).
> If we do plain simple "vacuum <tablename>" (again no full), we see
> pg_statistics_relid_att_index relfilenode grew instead of
> pg_statistics.
Don't think I believe that. Plain vacuum won't touch pg_statistic
at all (unless it's the target table of course). I'd expect ANALYZE
to make both the stats table and its index grow, though.
regards, tom lane