Re: Memory usage after upgrade to 9.2.4

[Daniel Cristian Cruz <danielcristian@xxxxxxxxx>]

2013/4/23 Adrian Klaver <adrian.klaver@xxxxxxxxx>

On 04/23/2013 04:23 AM, Daniel Cristian Cruz wrote:

2013/4/22 Daniel Cristian Cruz <danielcristian@xxxxxxxxx

<mailto:danielcristian@gmail.com>>

    query1:
    EXPLAIN ANALYZE SELECT ced.id_evento, ced.inicio, ced.termino,
    ced.evento, ced.id_eventos IS NOT NULL AS aula_dividida, ac.titulo,
    ced.id_tipo_evento, ced.tipo_evento, ac.media_referencia, p.nome,
    ef.nome AS nomeEspacoFisico, ( SELECT count ( pre2.presente ) > 0
    FROM turma.presenca pre2 WHERE pre2.id_aula = ac.id_aula AND
    pre2.id_evento = ac.id_evento AND pre2.id_diario = '64469' ) AS
    presenca, ced.id_aula FROM recurso.consulta_evento_diario ced LEFT
    JOIN recurso.evento e USING ( id_evento ) LEFT JOIN
    recurso.espaco_fisico ef USING ( id_espaco_fisico ) LEFT JOIN
    turma.aula_calendario ac USING ( id_aula, id_evento ) LEFT JOIN
    recurso.evento_participante ep USING ( id_evento ) LEFT JOIN
    senai.pessoa p USING ( id_pessoa ) WHERE id_diario = '64469' AND
    ced.id_evento NOT IN ( SELECT ec.id_evento_sobreposto FROM
    recurso.evento_conflito ec WHERE ec.id_evento_sobreposto =
    ced.id_evento AND ec.ignorado IS NULL ) AND ced.inicio BETWEEN
    '2013-04-14 00:00:00' AND '2013-04-20 23:59:59.999999' ORDER BY inicio;

    server 9.1:
    http://explain.depesz.com/s/fmM

    server 9.2:
    http://explain.depesz.com/s/wXm

    After run this one on server 9.2, RES memory reached 6.5GB, VIRT 15GB.


Since there is no response, is this memory usage normal? The same query
on version 9.1 doesn't use that much memory.

Not sure how it applies but I noticed that a GroupAggregate in 9.1 that took 1.22 secs became a a HashAggregate in the 9.2 query and took 12.54 secs.

I used to read a explain and find something, but this one is huge. Unfortunately I'm still working on data migration from the 9.2 to 9.1 and didn't get time to read it in detail...

I'm concerned about this because there is just only one report like
that. Does someone else has the same pattern when using inherited tables?

Also noticed that in your 9.2 production conf:

(no constraint_exclusion set)

Does this mean the default of 'partition' was left as is or that the setting was set to 'off'?

No, default:

senai=# show constraint_exclusion ;

 constraint_exclusion 

----------------------

 partition

(1 row)

--
Daniel Cristian Cruz
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