Fwd: sequential explain analyze command execution

---------- Forwarded message ----------
From: michel wildcat <m.wildcat82@gmail.com>
Date: 2012/5/21
Subject: Re: [NOVICE] sequential explain analyze command execution
To: Marcelo Sena <marceloslacerda@gmail.com>


thank you for answering,
I sent the second email because I received a failure notification from
the moderator as I wasn't registered...
for my question I received an answer from the french communauty that
satisfied my requirements. I used construction as follow:
 begin;
 explain analyze  query1;
 explain analyze  query2;
rollback;

in a  file myexplains.sql, then I run it on the command line with :
psql -f myexplains.sql > mysexplain.txt

thanks once again.

2012/5/20 Marcelo Sena <marceloslacerda@gmail.com>:
> Your first email was arrived correctly. There was no need for a second one.
>
> As for the query you could do something like
>
> explain analyze select *
> from (query1) as q1, (query2) as q2, ... (queryN) as qN;
>
> But that might incur in a lot of memory swapping if you select a bunch of
> rows in some of these queries.
>
> An alternative is doing something like
>
> create function myquerytest() returning integer as $$
>    query1
>    query2
>    ...
>    queryN
>    select 1;
> $$ language sql;
>
> explain analyze select myquerytest();
>
> drop function myquerytest();
>
> In either case I would put the code in a file and then "give" it to psql
> using the -f option and set the -o option to the desired output file . Since
> you are using pgadmin3 I have no idea.
>
> good luck,
> Marcelo Lacerda
>
>
> On Sat, May 19, 2012 at 5:20 AM, michel wildcat <m.wildcat82@gmail.com>
> wrote:
>>
>> hello,
>> I am working with PostgreSQL 9 in windows (pgAdmin3) and I'm trying to
>> execute distinct EXPLAIN ANALYZE command on some queries that are
>> really time consumming, and send the results to a single file.
>> can anybody help me to solve this please?
>> thanks
>>
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>
>