Migrating a traditional PostgreSQL database to Alibaba Cloud PolarDB for PostgreSQL can significantly improve performance, scalability, and cost efficiency. PolarDB’s compute-storage separation architecture and full PostgreSQL compatibility make it an excellent choice for modern workloads. In this blog, we walk through the key steps for a smooth and reliable migration.
Why Choose PolarDB for PostgreSQL?
PolarDB offers up to six read-only nodes, auto-scaling storage, high throughput, and low latency. Since it maintains strong compatibility with PostgreSQL, most applications can migrate with minimal changes.
Step-by-Step Migration Process
1. Evaluate Compatibility
Before starting, review your extensions, custom functions, and configurations. PolarDB supports most PostgreSQL features and extensions, but validating compatibility avoids surprises during migration.
2. Create a PolarDB for PostgreSQL Cluster
Log in to the Alibaba Cloud console and create a PolarDB PostgreSQL cluster. Choose appropriate specifications, storage type, and network settings such as VPC and security groups.
3. Prepare the Source PostgreSQL
Ensure your PostgreSQL instance is stable. Clean up unused data, enable WAL archiving if needed, and verify your backup tools (pg_dump or physical backup utilities).
4. Choose a Migration Method
You can migrate using:
Logical Backup (pg_dump / pg_restore): Ideal for small to medium databases or version upgrades.
Physical Backup (pg_basebackup): Suitable for large datasets.
Data Transmission Service (DTS): Enables real-time, low-downtime migration with continuous synchronization.
5. Execute Migration
Run the chosen migration approach. With DTS, configure source and destination connections and start the replication task. After full data migration, switch to incremental sync.
6. Validate and Cut Over
Test application connectivity, run integrity checks, verify performance, and finally switch traffic to the PolarDB cluster.