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We can group Oracle to Postgres migration steps or phases as follows:

1. Plan

a) Assessment Phase

• Assess the current state of the system/application to be migrated.
• Identify dependencies, risks, and constraints.
• Evaluate the scope and objectives of the migration.
• Gather requirements and define success criteria.
• Determine the desired outcome of the migration.

b) Planning Phase

• Develop a detailed migration plan based on the assessment.
• Define roles and responsibilities for team members involved in the migration.
• Create a timeline and set milestones for the migration process.
• Allocate resources (human, financial, technological) required for the migration.
• Identify potential challenges and develop contingency plans.

c) Preparation Phase

• Prepare the target environment for migration.
• Ensure necessary infrastructure is in place.
• Set up tools and systems for monitoring and managing the migration process.
• Communicate the migration plan and schedule to stakeholders.
• Conduct training sessions for the migration team, if necessary.
• Perform any prerequisite tasks such as backups, data cleansing, or environment setup.

2. Execute

a) Schema Migration Phase

• The Schema Migration Phase involves transferring the database structure from Oracle to PostgreSQL while ensuring compatibility and integrity.
• This phase includes analysing the Oracle schema, mapping it to PostgreSQL equivalents, generating DDL scripts, converting data types, migrating constraints and indexes, translating views, stored procedures, and triggers.
• Validate schema changes against the target environment.
• Test schema migration processes to ensure data consistency.

b) Data Migration Phase

• The Data Migration Phase involves transferring data from Oracle databases to PostgreSQL while ensuring accuracy, integrity, and consistency.
• This phase includes extracting data from Oracle databases, transforming it into a format compatible with PostgreSQL, loading it into the target PostgreSQL databases, and validating the migrated data to ensure completeness and correctness.

c) Application Code Migration Phase

• Migrate application codebase to the target environment.
• Update code dependencies and configurations as needed.
• Test application functionality in the new environment.
• Address any compatibility issues or bugs encountered during migration.
• Ensure seamless integration with other systems or components.

3. Verify

a) Testing Phase

• Conduct comprehensive testing of the migrated system/application.
• Perform functional testing to validate that all features work as expected.
• Execute performance testing to assess system efficiency and scalability.
• Carry out compatibility testing to ensure compatibility with different platforms and browsers.
• Validate security measures and protocols in the migrated environment.

b) Deployment Phase

• Plan and execute the final deployment of the migrated system/application.
• Monitor deployment processes to ensure smooth transition.
• Verify that all components are properly deployed and configured.
• Conduct post-deployment testing to confirm system stability and functionality.

4. Optimization and Maintenance

a) Post Migration Phase

• Conduct post-migration reviews to evaluate the success of the migration.
• Gather feedback from users and stakeholders.
• Identify areas for improvement and optimization.
• Documenting all the steps taken during Migration.

b) Maintenance and Support Phase

• Provide ongoing support for the migrated system/application.
• Monitor performance and address any issues or bugs that arise.
• Perform regular maintenance tasks such as updates, patches, and backups.
• Continuously optimize the system for better performance and efficiency.