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 | [EMAIL PROTECTED]
>
> 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
