Re: Really really slow select count(*) - Mailing list pgsql-performance
| From | felix |
|---|---|
| Subject | Re: Really really slow select count(*) |
| Date | |
| Msg-id | AANLkTimw2izMi4QfizQm72ABePackWXhhUU9EHdNf3zk@mail.gmail.com Whole thread Raw |
| In response to | Re: Really really slow select count(*) (Shaun Thomas <sthomas@peak6.com>) |
| Responses |
Re: Really really slow select count(*)
Re: Really really slow select count(*) |
| List | pgsql-performance |
it probably has good reason to hate me.
ns=> SELECT n.nspname AS schema_name, c.relname AS table_name,
ns-> c.reltuples AS row_count,
ns-> c.relpages*8/1024 AS mb_used,
ns-> pg_total_relation_size(c.oid)/1024/1024 AS total_mb_used
ns-> FROM pg_class c
ns-> JOIN pg_namespace n ON (n.oid=c.relnamespace)
ns-> WHERE c.relkind = 'r'
ns-> ORDER BY total_mb_used DESC
ns-> LIMIT 20;
schema_name | table_name | row_count | mb_used | total_mb_used
-------------+----------------------------------+-------------+---------+---------------
public | django_session | 1.47843e+07 | 4122 | 18832
public | traffic_tracking2010 | 9.81985e+06 | 811 | 1653
public | mailer_mailingmessagelog | 7.20214e+06 | 441 | 1082
public | auth_user | 3.20077e+06 | 572 | 791
public | fastadder_fastadderstatus | 302479 | 458 | 693
public | registration_registrationprofile | 3.01345e+06 | 248 | 404
public | reporting_dp_6c93734c | 1.1741e+06 | 82 | 224
public | peoplez_contact | 79759 | 18 | 221
public | traffic_tracking201101 | 1.49972e+06 | 163 | 204
public | reporting_dp_a3439e2a | 1.32739e+06 | 82 | 187
public | nsproperties_apthistory | 44906 | 69 | 126
public | nsproperties_apt | 30780 | 71 | 125
public | clients_showingrequest | 85175 | 77 | 103
public | reporting_dp_4ffe04ad | 330252 | 26 | 63
public | fastadder_fastadderstatuslog | 377402 | 28 | 60
public | nsmailings_officememotoagent | 268345 | 15 | 52
public | celery_taskmeta | 5041 | 12 | 32
public | mailer_messagelog | 168298 | 24 | 32
public | datapoints_job | 9167 | 12 | 23
public | fastadder_fastadderstatus_errors | 146314 | 7 | 21
oh and there in the footnotes to django they say "dont' forget to run the delete expired sessions management every once in a while". thanks guys.
it won't run now because its too big, I can delete them from psql though
well just think how sprightly my website will run tomorrow once I fix these.
On Fri, Feb 4, 2011 at 9:00 PM, Shaun Thomas <sthomas@peak6.com> wrote:
On 02/04/2011 01:59 PM, felix wrote:I think it just hates you.still no advice on the pages
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 800 | Chicago IL, 60604
312-676-8870
sthomas@peak6.com
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