Re: Query slow for new participants

Hello All,

Thank you very much for your help. You have really helped me out!

The query is now as fast as the others.

The indexes ix_companyarticledb_article and ix_companyarticledb_company are
removed.

The parameter for default_statistics_target was set to 1000

ANALYZE was performed on the database

I am so happy this worked out.

The pg_buffercache extension is now installed, and I will be working with
it the coming days to improve my settings.

First time I ran the query (evening, not high peak usage)

SELECT c.relname, count(*) AS buffers

FROM pg_buffercache b INNER JOIN pg_class c

ON b.relfilenode = pg_relation_filenode(c.oid) AND

b.reldatabase IN (0, (SELECT oid FROM pg_database

WHERE datname = current_database()))

GROUP BY c.relname

ORDER BY 2 DESC

LIMIT 10;

"pk_pricedb" "1479655"

"companyarticledb" "1378549"

"articledb" "780821"

"pricedb" "280771"

"descriptionindex" "138514"

"ix_pricedb" "122833"

"pk_articledb" "47290"

"EnabledIndex" "29958"

"strippedmanufacturernumberindex" "25604"

"strippedcataloguenumberindex" "24360"

How can I see if the whole DB is kept in RAM?

How to define the best setting for work_mem ?

Thanks for your help!

Regards,

Kim

Op di 26 feb. 2019 om 20:08 schreef Michael Lewis <mlewis(at)entrata(dot)com>:

>
> Indexes:
>> "pk_pricedb" PRIMARY KEY, btree (companyid, articleid)
>> "EnabledIndex" btree (enabled)
>> "ix_companyarticledb_article" btree (articleid)
>> "ix_companyarticledb_company" btree (companyid)
>>
>
> I'd say drop ix_companyarticledb_company since pk_pricedb can be used
> instead even if other queries are only on companyid field, and it will be
> faster for this case certainly since it targets the row you want directly
> from the index without the *"Rows Removed by Filter: 2674361"*
>
> I doubt the default_statistics_target = 100 default is doing you any
> favors. You may want to try increasing that to 500 or 1000 if you can
> afford a small increase in planning cost and more storage for the bigger
> sampling of stats.
>

--
Met vriendelijke groeten,