From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: Elielson Fontanezi <ElielsonF@prodam.sp.gov.br>
Cc: pgsql-general <pgsql-general@postgresql.org>
Cc: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: [SQL] ERROR: DefineIndex: index function must be marked iscachable
Date: Fri, 25 Jul 2003 12:21:15 -0700 (PDT)
Message-ID: <20030725121618.G37941-100000@megazone.bigpanda.com> (raw)
In-Reply-To: <A799F7647794D311924A005004ACEA9709699783@cprodamibs249.prodam>
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.
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone.bigpanda.com, ElielsonF@prodam.sp.gov.br, pgsql-general@postgresql.org
Subject: Re: [SQL] ERROR: DefineIndex: index function must be marked iscachable
In-Reply-To: <20030725121618.G37941-100000@megazone.bigpanda.com>
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