Kevin Grittner wrote: > Matthew Wakeling <matthew@flymine.org> wrote: > >> This is an FAQ. > > I just added it to the wiki FAQ page: > > http://wiki.postgresql.org/wiki/FAQ#Why_is_.22SELECT_count.28.2A.29_FROM_bigtable.3B.22_slow.3F Maybe you could add a short note why an estimation like from the pg_class table is usually enough.
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Соглашаюсь с условиями обработки персональных данных