Re: Postgres consuming way too much memory???

Added to TODO:

> o Fix memory leak from exceptions
>
> http://archives.postgresql.org/pgsql-performance/2006-06/msg0$

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Tom Lane wrote:
> "jody brownell" <jody(dot)brownell(at)Q1Labs(dot)com> writes:
> > BEGIN
> > INSERT into attacker_target_link (attacker_id, target_id) values (p_attacker, v_target);
> > v_returns_size := v_returns_size + 1;
> > v_returns[v_returns_size] := v_target;
>
> > EXCEPTION WHEN unique_violation THEN
> > -- do nothing... app cache may be out of date.
> > END;
>
> Hmm. There is a known problem that plpgsql leaks some memory when
> catching an exception:
> http://archives.postgresql.org/pgsql-hackers/2006-02/msg00885.php
>
> So if your problem case involves a whole lot of duplicates then that
> could explain the initial bloat. However, AFAIK that leakage is in
> a transaction-local memory context, so the space ought to be freed at
> transaction end. And Linux's malloc does know about giving space back
> to the kernel (unlike some platforms). So I'm not sure why you're
> seeing persistent bloat.
>
> Can you rewrite the function to not use an EXCEPTION block (perhaps
> a separate SELECT probe for each row --- note this won't be reliable
> if there are concurrent processes making insertions)? If so, does
> that fix the problem?
>
> regards, tom lane
>
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