Re: Less rows -> better performance? - Mailing list pgsql-performance

From Łukasz Filut
Subject Re: Less rows -> better performance?
Date
Msg-id 488590D2.4080800@wsb.pl
Whole thread Raw
In response to Re: Less rows -> better performance?  (Mario Weilguni <mweilguni@sime.com>)
List pgsql-performance
[...]
> You can check this too:
> select relname, relpages, reltuples, relkind
>  from pg_class
> where relkind in ('r', 'i')
> order by relpages desc limit 20;
>
> Will give you the top-20 tables and their sizes, 1 page is typically
> 8KB, so you can cross-check if relpages/reltuples is completly off,
> this is a good indicator for table/index bloat.
use this query :
select pg_size_pretty(pg_relation_size(oid)) as relation_size,relname,
relpages, reltuples, relkind
 from pg_class
where relkind in ('r', 'i')
order by relpages desc limit 20;

output will be much more readeable
>
> Regards,
> Mario
    Lukasz

--
Lukasz Filut
DBA - IT Group, WSB-TEB Corporation
Poznan - Poland


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