Re: very, very slow performance

2009/2/20 Tena Sakai <tsakai@gallo.ucsf.edu>:
> Hi Everybody,
>
> Here's the query (please read them in fixed-size font, if
> you can):
>
>  select subjectid, genotype.markerid, a1.value as allele1,
>         a2.value as allele2, genotype.dateCreated,
>         genotype.dateReplaced, genotype.ignore,
>         genotype.inconsistent
>    from genotype, allele a1, allele a2
>   where
>         allele1id = a1.alleleid
>     and
>         allele2id = a2.alleleid;
>
> Genotype table mentioned above has about 600,000,000+ rows.  As
> I mentioned, there are 20 more of them running concurrently.
> 3 other jobs look like:
>

Do you tried partitioned tables? diferent tablespaces? set the storage
external for
more important columns? what kind of indexes do you have?

>  SELECT a.markerid,a.type,a.localname,b.ncbibuild,
>         a.chromosome,a.geneticposition,b.physicalposition,
>         a.strand,a.stdflanks,a.maxflanks,a.datecreated,
>         a.datereplaced,a.sourcetablename,a.sourceid,
>         b.dbsnprsid,a.ignore,a.gene
>    FROM public.marker a, public.snpposition b
>   WHERE
>         a.ignore= 'N'
>     AND a.datecreated <= (timestamp'Wed Oct 29 09:35:54.266 2008')
>     AND a.datereplaced > (timestamp'Wed Oct 29 09:35:54.266 2008')
>     AND a.localname IN
> ('RS10757474','RS7859598','RS6148','RS9792663','RS1541125',
>                          'RS10511446','RS10814410','RS12338622','RS875587',
>                          'RS1590979', 'RS748786','RS958505','RS12352961',
>                           and on and on and on...);
>
>
>   insert into summarystats
>                     select 'Marker by Chromosomes', chromosome,
> sourcetablename,
>                             count(*), null, to_timestamp('2009-02-18
> 20:29:40.125',
>                             'yyyy-mm-dd hh:mi:ss.ms')
>                       from marker
>                      where ignore = 'N'
>                        and datereplaced = '3000-01-01 12:00:00.000'
>                        and exists (select 1
>                                      from genotype
>                                     where genotype.markerid =
> marker.markerid
>                                       and genotype.ignore = 'N'
>                                       and genotype.datereplaced =
> '3000-01-01 12:00:00.000')
>                      group by chromosome, sourcetablename;
>
>   COPY public.genotype (genotypeid, subjectid, markerid,
>                         allele1id, allele2id, datecreated, datereplaced,
>                         ignore, inconsistent, sourcetablename, sourceid)
>     TO stdout;
>

Like Scott saids, try to run explain analyze for those querys, then
post the results.


>
> Can anybody suggest anything that I can do to gain speed?
> Any help is much appreciated.
>

I recommend follow this thread:
http://archives.postgresql.org/pgsql-hackers/2009-02/msg00718.php


> Regards,
>
> Tena Sakai
> tsakai@gallo.ucsf.edu
>
>
>



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