Re: Postgres DB Slowness

On 8/22/19 9:35 AM, soumik(dot)bhattacharjee(at)kpn(dot)com wrote:
>
> *From:*Ron <ronljohnsonjr(at)gmail(dot)com>
> *Sent:* Thursday, August 22, 2019 4:26 PM
> *To:* pgsql-admin(at)lists(dot)postgresql(dot)org
> *Subject:* Re: Postgres DB Slowness
>
> On 8/22/19 9:04 AM, soumik(dot)bhattacharjee(at)kpn(dot)com
> <mailto:soumik(dot)bhattacharjee(at)kpn(dot)com> wrote:
>
> Hello Members,
>
> We have the below PostgreSQL database recently migrated from Oracle.
>
> The postgres DB parameters are *_attached_* here.
>
> # DB Version: 10
>
> # OS Type: Linux
>
> # Total Memory (RAM): 30 GB
>
> #CPU
>
> nproc --all
>
> 2
>
> There is huge slowness in the database now with any queries.
>
> *Oracle*- Select * from TABLENAME- in takes  0.009 milliseconds
>
> *PostgreSQL*- Same query takes more than 2 minutes.
>
>
> Have you validated that the Postgres server has the same indexes?
>
> If so, did you ANALYZE all the tables?
>
> Yes Ron, we migrated from Oracle as per same structure and indexes.
>
> I did the analyze for 2-3 tables now as per my SQL query I wrote and also
> ran for one particular table below –
>
> VACUUM (FULL,ANALYZE) table_name.
>

What does the query plan for that query look like?

What's the table definition?

Is the hardware comparable?  (Might it be a SAN or VM issue?)

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