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Mahina Sheikh
Mahina Sheikh

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PostgreSQL's Logical Replication

PostgreSQL offers a robust data replication approach: logical replication. Unlike physical replication, logical replication focuses on data objects and changes, utilizing replication identities like primary keys. This method provides fine-grained control over data sync and security.

Working

  • Subscribers pull data from publications on the publisher.
  • Initial snapshot copied to subscribers.
  • Real-time changes transmitted for consistent updates.

Benefits

  1. Granular Changes: Efficiently sends incremental changes to subscribers.
  2. Trigger Support: Triggers fired for individual changes on subscribers.
  3. Consolidation: Merges databases for analytical tasks.
  4. Cross-Version Support: Replicates across different PostgreSQL versions.
  5. Cross-Platform Replication: Works across diverse platforms.
  6. Data Access Management: Offers controlled access to replicated data.
  7. Subset Sharing: Shares a database subset among multiple databases.

Subscriber Flexibility

  • Subscriber acts as a typical PostgreSQL instance.
  • Can publish to other databases with its publications.
  • Minimizes conflicts if treated as read-only.

Conclusion

PostgreSQL's logical replication ensures real-time data synchronization across databases. Its adaptability, consistency, and diverse applications make it indispensable for maintaining data accuracy in distributed setups.

Reference

Logical Replication

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