Re: Performance degradation after upgrading from 9.5 to 14

I'm not sure, does it helps you but read this:
https://www.cybertec-postgresql.com/en/b-tree-index-improvements-in-postgresql-v12/
"Since upgrading with pg_upgrade does not change the data files, indexes
will still be in version 3 after an upgrade"

I reindexed all my database, when did upgrade pg<12 -> pg>=12 if pg_upgrade
was a tool. exp-imp for upgrade does not need reindex.
br
Kaido

On Wed, 17 Apr 2024 at 20:39, Marcin Giedz <marcin(dot)giedz(at)arise(dot)pl> wrote:

> how about this:
>
> jit = off ?
>
> Marcin
>
>
> On Wed, 17 Apr 2024 at 19:33, Johnathan Tiamoh <johnathantiamoh(at)gmail(dot)com>
> wrote:
>
>> 1) How did you upgrade? pg_dump or pg_upgrade?
>>
>> I use pg_ugrade with kink option.
>>
>> 2) Did you run ANALYZE to collect statistics after the upgrade?
>>
>>
>> Yes. I ran vacuumdb-analyze in stages after the upgrade
>>
>> 3) Did you transfer the configuration, or did you just create a new
>> cluster with the default values?
>>
>> I transfer the configuration
>>
>> 4) What exactly is slower? Queries? Inserts?
>>
>> queries
>>
>> 5) Can you quantify the impact? Is it 2x slower? 100x slower?
>>
>> it's more than 5 times slower than before. Very high load averages
>>
>> On Wed, Apr 17, 2024 at 1:25 PM Tomas Vondra <
>> tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
>>
>>> On 4/17/24 19:13, Johnathan Tiamoh wrote:
>>> > Hello,
>>> >
>>> >
>>> > I performed an upgrade from postgresql-9.5 to postgresql-14 and the
>>> > performance has degraded drastically.
>>> >
>>> > Please, is they any advice on getting performance back ?
>>> >
>>>
>>> There's very little practical advice we can provide based on this
>>> report, because it's missing any useful details. There's a number of
>>> things that might have caused this, but we'd have to speculate.
>>>
>>> For example:
>>>
>>> 1) How did you upgrade? pg_dump or pg_upgrade?
>>>
>>> 2) Did you run ANALYZE to collect statistics after the upgrade?
>>>
>>> 3) Did you transfer the configuration, or did you just create a new
>>> cluster with the default values?
>>>
>>> 4) What exactly is slower? Queries? Inserts?
>>>
>>> 5) Can you quantify the impact? Is it 2x slower? 100x slower?
>>>
>>>
>>> regards
>>>
>>>
>>> --
>>> Tomas Vondra
>>> EnterpriseDB: http://www.enterprisedb.com
>>> The Enterprise PostgreSQL Company
>>>
>>