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Update oracle database from 12c to 19c

Preparation

Review Oracle documentation for upgrading from 12c to 19c.

Identify potential issues and impact on existing applications.

Take a backup of the existing database.

Test the upgrade process in a non-production environment.

Pre-Upgrade Tasks

Check hardware and software requirements for Oracle 19c.

Apply any required patches or updates to the existing Oracle 12c database.

Verify sufficient disk space for the upgrade.

Disable any scheduled jobs or maintenance tasks.

Database Upgrade

Download and install the Oracle 19c software.

Run the Pre-Upgrade Information Tool (preupgrade.jar) to check for any potential issues.

Review the pre-upgrade report and address any identified issues.

Start the database in upgrade mode.

Run the Database Upgrade Assistant (DBUA) or perform a manual upgrade using command-line utilities.

Monitor the upgrade progress and resolve any encountered errors.

Validate the upgraded database for data integrity and functionality.

Post-Upgrade Tasks

Run the post-upgrade steps recommended by Oracle.

Update client applications and configurations to use the new Oracle 19c database.

Test application compatibility and functionality with the upgraded database.

Enable any disabled jobs or maintenance tasks.

Monitor the performance of the upgraded database and tune if necessary.

Update documentation and notify relevant stakeholders about the successful upgrade.

Post-Upgrade Validation

Perform thorough functional and regression testing.

Verify the performance and stability of the upgraded database.

Validate backup and restore procedures for the new database version.

Address any issues or discrepancies found during testing.

Obtain sign-off from stakeholders and project closure.

Note: This checklist provides a general outline, and the specific steps may vary depending on the organization's setup and requirements. It is recommended to refer to Oracle's official documentation and seek expert guidance for a successful Oracle database upgrade.

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