fetch data from postgreSQl db to oracle Db using PlsQl - postgresql

We have a PostgreSQL which is installed in openshift container DB.
I wanted to fetch data from few tables in Postgres Db(PostgreSQL) and load it to Oracle Db.
Please give me some idea on how to connect and fetch the data from Postgres.
Thanks!

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i tried using dblink to connect two servers but it is not successful
I tried using dblink and it did not work. My postgres version is latest and above 13.6 and it is aurora serverless V2.

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I created an RDS Postgres instance. I'm new to RDS.
db host:
demodb.xxxuxxvxxxxx.us-east-2.rds.amazonaws.com
db identifier:
demodb
Every tutorial says to connect with this URL:
jdbc:postgresql://demodb.xxxuxxvxxxxx.us-east-2.rds.amazonaws.com:5432/demodb
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FATAl: database "demodb" does not exist.
demodb is db instance identifier. It is NOT the name of your database inside of PostgreSQL.
By default RDS PostgreSQL does not create a database for you. It seems to me that you haven't created an actual database when you setup your RDS PostgreSQL.
To create a database at RDS creation there is an option called Initial database name where you should specify the name of the database you want. Otherwise, no database is created, which is a default behavior:

How to restore PostgreSQL database schema dump into different database (Eg: Apache Derby,H2)?

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We are using PostgreSQL database and it can't be used as in-memory database.
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Any idea how can I do something like this?
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