Re: Why memory is not used ? Why vacuum so slow ?

=?iso-8859-15?q?Herv=E9=20Piedvache?= <herve@elma.fr> writes:
> and I have also saw that the full vacuum for pg_atribute seems
> to be so slow ... more than 1 min for 7256 tupples ? Is this is normal ?

> INFO:  --Relation pg_catalog.pg_attribute--
> INFO:  Pages 119: Changed 0, reaped 1, Empty 0, New 0; Tup 7256: Vac 0, Keep/
> VTL 0/0, UnUsed 3, MinLen 128, MaxLen 128; Re-using: Free/Avail. Space
> 14664/504; EndEmpty/Avail. Pages 0/1.
>         CPU 0.00s/0.00u sec elapsed 0.08 sec.
> INFO:  Index pg_attribute_relid_attnam_index: Pages 21082; Tuples 7256:
> Deleted 0.
>         CPU 0.83s/0.13u sec elapsed 59.32 sec.
> INFO:  Index pg_attribute_relid_attnum_index: Pages 5147; Tuples 7256: Deleted
> 0.
>         CPU 0.26s/0.03u sec elapsed 8.79 sec.

You're suffering from index bloat (21000 pages in an index for a
119-page table!?).  Updating to 7.4 would probably fix this, but
if that's not practical consider reindexing pg_attribute.

            regards, tom lane