Steps for migrating from Oracle to PostgreSQL using a single backup format:

Install and configure the Ora2Pg tool: Ora2Pg is a tool that can be used to convert Oracle database schema and data into PostgreSQL. Install and configure the Ora2Pg tool on your system.

Convert the Oracle database schema to PostgreSQL: Use the Ora2Pg tool to convert the Oracle database schema to PostgreSQL. You can use the following command to generate the schema.sql file:

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ora2pg -c config_file -t SHOW -o schema.sql

This will generate the schema file with the PostgreSQL syntax.

Create a new PostgreSQL database: Create a new PostgreSQL database to import the converted schema and data. You can use the following command to create a new database:

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createdb -U <username> -h <hostname> <database_name>

Import the converted schema into PostgreSQL: Import the converted schema into the new PostgreSQL database. You can use the following command to import the schema:

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psql -U <username> -h <hostname> -d <database_name> -f schema.sql

Convert the Oracle data to PostgreSQL format: Use the Ora2Pg tool to convert the Oracle data into PostgreSQL format. You can use the following command to generate the data.sql file:

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ora2pg -c config_file -t COPY -o data.sql

Import the converted data into PostgreSQL: Import the converted data into the new PostgreSQL database. You can use the following command to import the data:

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psql -U <username> -h <hostname> -d <database_name> -f data.sql

Test the PostgreSQL database: Once the data is imported, test the PostgreSQL database to ensure that it is working as expected.

Please note that the above steps are general and may vary depending on the complexity of your database schema and data. Additionally, you may need to modify the configuration file used by Ora2Pg to suit your requirements.