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From: Erik Brandsberg <[email protected]>
To: kunwar singh <[email protected]>
Cc: [email protected]
Subject: Re: How to handle application connectivity change when moving from Oracle to Postgres in GCP
Date: Sun, 10 Sep 2023 13:55:50 -0400
Message-ID: <CAFcck8G2VY682z4uv8+JhK1j1zZ8H7qUx-ccgtjXNXuDvVM7LQ@mail.gmail.com> (raw)
In-Reply-To: <CAJSrDUojpnXU7gTN51nQ0JO+KzdLJieusMAqm7NYo68UGfv_Ow@mail.gmail.com>
References: <CAJSrDUojpnXU7gTN51nQ0JO+KzdLJieusMAqm7NYo68UGfv_Ow@mail.gmail.com>

Keep in mind that it is likely that a significant portion of the data
access code may need to be rewritten unless you are using an ORM that does
the conversion for you.  Most apps can't be migrated directly from Oracle
to Postgres.  Based on the questions you are asking, I seriously suggest
you contact a company that assists with migrations in order to answer your
questions and highlight the issues you may be facing.

On Sun, Sep 10, 2023 at 1:43 PM kunwar singh <[email protected]>
wrote:

> Hi Listers,
>
> Say we have this App->DB connectivity Model.
>
> APP1
> Contains synonyms which point to objects under APP1.
>
> APPOWN
> Contains the tables, indexes
>
> And it is a Java application that connects to APP1.
>
> Now when the database is switched from Oracle 19c onprem to CloudSQL
> Postgres say v15.
> Questions that I have:
>
> 1. What needs to be done at the database end in terms of schema setup in
> order to ensure the application is able to connect to the relevant tables
> without any concerns?
> 2. Do I need to create users APP1 and APPOWN in postgres? If so, what
> privileges are required to be assigned to these?
> 3. How to tie them with service accounts?
> 4. With which username/service account does the application make
> connection to the database?
>
> I still don't understand user/schema concepts in postgres tbh as I'm
> still a noob :)
>
>
>
> --
> Cheers,
> Kunwar
>

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