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From: Ron Johnson <ronljohnsonjr@gmail.com>
Date: Tue, 17 Dec 2024 09:41:33 -0500
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Subject: Re: Postgres upgradation
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On Tue, Dec 17, 2024 at 5:21=E2=80=AFAM Narendran .j <jnarendran3@gmail.com=
> wrote:

> Hello All,
>
> In our environment, PostgreSQL is currently running on lower versions,
> ranging from 9 to 11.
>

PG 9.x is presumably running on an EOL version of the OS, meaning you'll
migrate to a current version of the OS.  That means you'll use
pg_dump/pg_restore OR Logical Replication, instead of pg_upgrade.

You should probably do the same on the server running PG 11.


> We are planning to upgrade to the latest version, and I have a few
> questions regarding the process.
>
> What are the key considerations or checks we need to perform before the
> upgrade?
>
> Can we directly upgrade from version 9 to 15, or is a step-by-step upgrad=
e
> required?
>

Read https://www.postgresql.org/docs/current/app-pgdump.html and
https://www.postgresql.org/docs/current/app-pgrestore.html


> How should we handle extensions during the upgrade process?
>

Depends on the extension, and how you install Postgresql.  Since we install
from RPM packages, it was as simple as installing the latest versions of
those packages, and then running pg_restore.


> What challenges or issues should we anticipate during or after the upgrad=
e?
>

You might need to update db drivers like JDBC at the same time.


> If anyone with experience in upgrading Postgres, please share your
> guidance.
>

Since pg_dump can be performed online, test the process beforehand.  I'd
bet that your app servers are also running on old servers, too.  Upgrade
them, and you'll have a perfect chance to test the system beforehand.

The only hiccup we faced when moving from PG 9.6 to 14 was that the updated
JDBC drivers on the application servers choked on some strings with quotes
in them.

YMMV.

--=20
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!

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<div dir=3D"ltr"><div dir=3D"ltr">On Tue, Dec 17, 2024 at 5:21=E2=80=AFAM N=
arendran .j &lt;<a href=3D"mailto:jnarendran3@gmail.com">jnarendran3@gmail.=
com</a>&gt; wrote:</div><div class=3D"gmail_quote gmail_quote_container"><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">Hello All=
,<div dir=3D"auto"><br></div><div dir=3D"auto">In our environment, PostgreS=
QL is currently running on lower versions, ranging from 9 to 11.</div></div=
></blockquote><div><br></div><div><div class=3D"gmail_quote gmail_quote_con=
tainer"><div>PG 9.x is presumably running on an EOL version of the OS, mean=
ing you&#39;ll migrate to a current version of the OS.=C2=A0 That means you=
&#39;ll use pg_dump/pg_restore OR Logical Replication, instead of pg_upgrad=
e.</div><div><br></div><div>You should probably do the same on the server r=
unning PG 11.</div></div><div>=C2=A0</div></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto"> We are planning=
 to upgrade to the latest version, and I have a few questions regarding the=
 process.</div><div dir=3D"auto"><br></div><div dir=3D"auto">What are the k=
ey considerations or checks we need to perform before the upgrade?</div><di=
v dir=3D"auto"><br></div><div dir=3D"auto">Can we directly upgrade from ver=
sion 9 to 15, or is a step-by-step upgrade required?</div></div></blockquot=
e><div><br></div><div>Read=C2=A0<a href=3D"https://www.postgresql.org/docs/=
current/app-pgdump.html">https://www.postgresql.org/docs/current/app-pgdump=
.html</a> and=C2=A0<a href=3D"https://www.postgresql.org/docs/current/app-p=
grestore.html">https://www.postgresql.org/docs/current/app-pgrestore.html</=
a></div><div><br></div><div><br></div><div>=C2=A0</div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto">How shoul=
d we handle extensions during the upgrade process?</div></div></blockquote>=
<div><br></div><div>Depends on the extension, and how you install Postgresq=
l.=C2=A0 Since we install from RPM packages, it was as simple as installing=
 the latest versions of those packages, and then running pg_restore.</div><=
div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"auto"><div dir=3D"auto">What challenges or issues should we anticipate =
during or after the upgrade?</div></div></blockquote><div><br></div><div>Yo=
u might need to update db drivers like JDBC at the same time.</div><div>=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto=
"><div dir=3D"auto">If anyone with experience in upgrading Postgres, please=
 share your guidance.</div></div></blockquote><div><br></div><div>Since pg_=
dump can be performed online, test the process beforehand.=C2=A0 I&#39;d be=
t that your app servers are also running on old servers, too.=C2=A0 Upgrade=
 them, and you&#39;ll have a perfect chance to test the system beforehand.<=
/div><div><br></div><div>The only hiccup we faced when moving from PG 9.6 t=
o 14 was that the updated JDBC drivers on the application servers choked on=
 some strings with quotes in them.</div><div><br></div><div>YMMV.</div><div=
><br></div></div><span class=3D"gmail_signature_prefix">-- </span><br><div =
dir=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr">Death to &lt;Redacte=
d&gt;, and butter sauce.<div>Don&#39;t boil me, I&#39;m still alive.<br><di=
v><div>&lt;Redacted&gt; lobster!</div></div></div></div></div></div>

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