Re: BUG #16334: We recently upgraded PG version from 9.5 to 10.10 and system performance is not so good

Please don't top-post, it makes it hard to follow the discussion.

On Thu, Apr 02, 2020 at 03:52:56PM +0530, Tejaswini GC wrote:
>
> I'm in touch with our hosting team to get more information for your queries.
> As of now I can share these details.
> We did analyze on the DB, but not the vacuum,
> We are using AWS RDS.
>
> Please help me with these queries as well.
>
> 1) Will the process change if we use AWS RDS.

No idea, that's a question you should ask them.

> 2) What kind of vacuum should be done on the DB, as there are many types of
> vacuum.

A regular vacuum, as in:

VACUUM ANALYZE

in all your databases.

> On Thu, Apr 2, 2020 at 2:17 PM Julien Rouhaud <rjuju123(at)gmail(dot)com> wrote:
>
> > Hi,
> >
> > On Thu, Apr 02, 2020 at 03:52:25AM +0000, PG Bug reporting form wrote:
> > > The following bug has been logged on the website:
> > >
> > > Bug reference: 16334
> > > Logged by: Tejaswini GC
> > > Email address: tejaswini(dot)gc(at)decathlon(dot)com
> > > PostgreSQL version: 10.10
> > > Operating system: Centos 7
> > > Description:
> >
> >
> > First of all, this is not a bug. You should have instead started a
> > discussion
> > on pgsql-general or pgsql-performance. I'm redirecting the discussion on
> > -performance.
> >
> >
> > > We have upgraded our database into version 10.10.
> >
> >
> > How did you upgrade?
> >
> >
> > > After upgrading we could see that the system performance is bad , and
> > one of
> > > the applications linked to it via web service is not working.
> >
> >
> > Do you have any errors in the postgres logs?
> >
> >
> > > During this upgrade we have not done any code changes either on the
> > > application side or on our ERP side.
> > >
> > > We are trying to debug everything from application perse, but till now
> > we do
> > > not have any lead.
> > >
> > > Can you tell us are there any measures that we need to take after
> > upgrade.
> >
> >
> > It depends on how you did the upgrade. If you used pg_upgrade, did you
> > run the
> > generated script as documented in step 13 at
> > https://www.postgresql.org/docs/current/pgupgrade.html?
> >
> > Otherwise, at least a database-wide VACUUM ANALYZE on every database is the
> > bare minimum to run after an upgrade.
> >