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If you’re thinking about moving your on-premises Oracle database to AWS EC2, using Oracle Data Guard is a smart way to do it. This method helps keep your data safe and minimizes downtime during the migration. Here’s a simple guide to help you plan and execute this process smoothly.
First, set up your architecture carefully. Your main database stays on your local servers, syncing with standby databases on EC2 in the cloud. To make sure your database stays available even if something goes wrong, place your standby servers—named S1 and S2—in different Availability Zones within Melbourne. This setup adds an extra layer of protection.
Next, you need to consider how the data is transferred. Data Guard can send redo data either immediately (synchronous) or with a slight delay (asynchronous). If your priority is zero data loss and your network is fast enough, go for synchronous transport. If performance is more important and you’re okay with minimal data loss, asynchronous is a good choice.
For the best performance, a dedicated, high-bandwidth connection between your data center and AWS is recommended. AWS Direct Connect is a great option here because it offers stable, low-latency connectivity essential for Data Guard’s continuous data synchronization.
Before starting the migration, make sure you’ve completed these initial steps:
– Create a Virtual Private Cloud (VPC) and subnets on AWS.
– Set up security groups and network access rules for Data Guard traffic.
– Choose the right EC2 instance types that can handle your database workload.
– Install the same version of Oracle software on your EC2 instances that runs on your current servers.
When you’re ready to cut over, switch the roles of your standby database to primary during a planned maintenance window. During this switch, your applications will need to be temporarily disconnected until they connect to the new primary database in EC2.
Remember to double-check that your source and target Oracle versions match compatibility requirements. It’s also wise to practice the switchover process a few times before the real cutover to ensure everything runs smoothly. Update your application connection strings to point to the new database once the switch is complete. Consider using logical hostnames to make future migration and disaster recovery easier.
This approach with Data Guard helps you reduce downtime and offers a reliable backup plan if something doesn’t go as expected during migration. It’s a practical way to keep your business running smoothly during this transition.
Sources include AWS guidance and best practices for Oracle database migration, which can provide more technical details if needed.
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