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
- Granular Changes: Efficiently sends incremental changes to subscribers.
- Trigger Support: Triggers fired for individual changes on subscribers.
- Consolidation: Merges databases for analytical tasks.
- Cross-Version Support: Replicates across different PostgreSQL versions.
- Cross-Platform Replication: Works across diverse platforms.
- Data Access Management: Offers controlled access to replicated data.
- 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.
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