Re: Tuning queries inside a function - Mailing list pgsql-general

From Mike Nolan
Subject Re: Tuning queries inside a function
Date
Msg-id 200504302029.j3UKTWen026937@gw.tssi.com
Whole thread Raw
In response to Re: Tuning queries inside a function  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Tuning queries inside a function  (Richard Huxton <dev@archonet.com>)
List pgsql-general
> > Maybe you could return a refcursor pointing to the EXPLAIN ANALYZE of
> > the query inside the function.
>
> The raw materials exist to do this: if you know which elements of a
> query will be replaced by plpgsql variables, you can duplicate the
> results via
>
>     PREPARE foo(...) AS ...
>     EXPLAIN EXECUTE foo(...)
>
> Certainly there is a lot more that we can and must do about making
> it easier to debug and tune plpgsql functions.  But you can fix 'em
> with a little determination even now...

If I know which elements of a query will be replaced by variables, I can
enter the query in psql, which I've done.  (I can always output the variables
to the log from inside the function.)  But what I'd rather have is some
way of getting and logging the 'explain' output for a series of function
calls, which I can't seem to achieve inside a function.

I think in the long run I may have to redefine the database to cut back on
the number of queries inside the function.
--
Mike Nolan

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