Re: [PERFORM] POWA doesn't show queries executed

From: Marco Nietz
Subject: Re: [PERFORM] POWA doesn't show queries executed
Date: ,
Msg-id: 62b98776-5f6d-d939-485a-c02c696d7ed6@mnietz.de
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In response to: [PERFORM] POWA doesn't show queries executed  (Neto pr)
List: pgsql-performance

Hi,

powa relies on extensions (pg_stat_statements, pg_qualstats) that needs 
to be installed in every database you want to monitor. Maybe you just 
installed them only into postgres database?!

Best regards
Marco


Am 18.11.2017 um 02:52 schrieb Neto pr:
> Dear all
> 
> I have successfully installed POWA (http://dalibo.github.io/powa), 
> including all required extensions, see the following Printscreen of its 
> operation of end email.
> 
> But when executing queries in psql- comand line, this queries are not 
> monitored by powa. I have checked that only Postgresql internal catalog 
> queries are shown. .
> I need the Optimize Query functionality and mainly the suggestion of 
> indexes.
> But that does not work, by clicking on the optimize query option, 
> returns zero suggestions.
> 
> See below that I created a scenario, with a table with a large amount of 
> data, to check if the tool would suggest some index, and when making a 
> complex query, no index is suggested.
> 
> Someone uses POWA, knows if they have to configure something so that the 
> queries are monitored and show suggestions ??
> 
> ---------------------- Printscreens of my environment partially 
> working:--------------
> 
> https://sites.google.com/site/eletrolareshop/repositorio/powa1.jpeg
> https://sites.google.com/site/eletrolareshop/repositorio/powa2.jpeg
> https://sites.google.com/site/eletrolareshop/repositorio/powa3.jpeg
> 
> -------------------------------------------------------------------------------------------------------
> ------------------------ scenario to verify the suggestion of indices  
> --------------------
> postgres=# create table city_habitant (number_habitant text);
> CREATE TABLE
> postgres=# insert into  city_habitant (number_habitant) select 'São 
> Paulo' from (select generate_series (1, 4000000)) a;
> INSERT 0 4000000
> postgres=# insert into  city_habitant (number_habitant) select 'Rio de 
> Janeiro' from (select generate_series (1, 8000000)) a;
> INSERT 0 8000000
> postgres=# insert into  city_habitant (number_habitant) select 'Recife' 
> from (select generate_series (1, 6000000)) a;
> INSERT 0 6000000
> postgres=# insert into  city_habitant (number_habitant) select 'Santos' 
> from (select generate_series (1, 2000000)) a;
> INSERT 0 2000000
> postgres=# insert into  city_habitant (number_habitant) select 'Chui' 
> from (select generate_series (1, 6)) a;
> INSERT 0 6
> postgres=# SELECT number_habitant, count(number_habitant) FROM 
>   city_habitant GROUP BY number_habitant;
>   number_habitant   |  count
> -------------------+------
>   Rio de Janeiro    | 8000000
>   Recife                 | 6000000
>   Santos                | 2000000
>   São Paulo          | 4000000
>   Chui                   |  6
> (5 rows)
> 
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