I have tried testing the perofmance on indexing array element using standard btree and it doesn't help anything. It still costing alot.
create index idx_properties_address_4 on properties ((address_arr[4]))
does contrib/intarray effective for text array?
On 3/16/06, Oleg Bartunov <oleg@xxxxxxxxxx> wrote:
contrib/intarray might help you
Oleg
On Wed, 15 Mar 2006, karly@xxxxxxxxxxxxx wrote:
> On Wed, Mar 15, 2006 at 09:36:04AM -0700, Brendan Duddridge wrote:
>> Hi,
>>
>> Is it possible to put an index on an array column?
>
> Apparently yes (I just did it as a test). However, consider the
> following from the manual.
>
> Tip: Arrays are not sets; searching for specific array elements
> may be a sign of database misdesign. Consider using a separate
> table with a row for each item that would be an array element. This
> will be easier to search, and is likely to scale up better to large
> numbers of elements.[1]
>
> Arrays are attractive, but it seems they most often aren't the best
> solution. FOr instance, I beleive I read somewhere that the index
> will be on the whole array, and the individual elements are not
> indexed, so
>
> WHERE ary = {foo,bar}
>
> might benefit from your index, but
>
> WHERE 'foo' = ANY(ary)
>
> probably wouldn't. At least that's the impression I got from
> reading the archives of this list. I haven't done any testing of
> it.
>
>
> -karl
>
>
>
> 1. http://www.postgresql.org/docs/8.0/interactive/arrays.html#AEN5491
>
>>
>> Thanks,
>>
>> ____________________________________________________________________
>> Brendan Duddridge | CTO | 403-277-5591 x24 | brendan@xxxxxxxxxxxxxx
>>
>> ClickSpace Interactive Inc.
>> Suite L100, 239 - 10th Ave. SE
>> Calgary, AB T2G 0V9
>>
>> http://www.clickspace.com
>>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet ( www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
---------------------------(end of broadcast)---------------------------
TIP 2: Don't 'kill -9' the postmaster
