ERROR: DefineIndex: index function must be marked iscachable

On Fri, 25 Jul 2003, Elielson Fontanezi wrote:

What can I do in this case?
I could not found anything about iscachable.

postgres$ cat in.sql
create index bt_proposta_f01 on proposta
using btree (func_cod_secretaria(nr_proponente));

postgres$ psql -d escola -f in.sql
psql:in.sql:2: ERROR: DefineIndex: index function must be marked iscachable

Check the create function reference page, I believe you'd need to add WITH
(iscachable) to the end of the function creation.

iscachable means that the function always returnes the same result when
given the same arguments. It's a prereq to using the function in an
index. If your function doesn't meet those requirements (for example if it
does a query on a table) making an index on that function is a bad idea.

Dnia 2003-07-25 21:09, U�ytkownik Elielson Fontanezi napisa�:

Hi all!

What can I do in this case?
I could not found anything about iscachable.

postgres$ cat in.sql
create index bt_proposta_f01 on proposta
using btree (func_cod_secretaria(nr_proponente));

postgres$ psql -d escola -f in.sql
psql:in.sql:2: ERROR: DefineIndex: index function must be marked iscachable
postgres$

You should follow the error. Your function func_cod_secretaria has to be
declared as cacheable. (Look into documentation - sql commands / create
function). IMMUTABLE function should help.

This function has also for some nr_proponente returns always the same
value (look at IMMUTABLE description)

Regards,
Tomasz Myrta

On Fri, 25 Jul 2003, Stephan Szabo wrote:

On Fri, 25 Jul 2003, Elielson Fontanezi wrote:

What can I do in this case?
I could not found anything about iscachable.

postgres$ cat in.sql
create index bt_proposta_f01 on proposta
using btree (func_cod_secretaria(nr_proponente));

postgres$ psql -d escola -f in.sql
psql:in.sql:2: ERROR: DefineIndex: index function must be marked iscachable

Check the create function reference page, I believe you'd need to add WITH
(iscachable) to the end of the function creation.

iscachable means that the function always returnes the same result when
given the same arguments. It's a prereq to using the function in an
index. If your function doesn't meet those requirements (for example if it
does a query on a table) making an index on that function is a bad idea.

Almost forgot. In recent versions you'd specify that the function was
IMMUTABLE and I believe the error message would use such as well. What
version are you using (it might be worth considering an upgrade to 7.4
when it comes out)