Managing replication of PostgreSQL (Simon Riggs)
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This document discusses PostgreSQL replication. It provides an overview of replication use cases like high availability and scalability. It describes the different replication mechanisms in PostgreSQL, including trigger-based and log-based replication. It outlines developments in log shipping in different PostgreSQL versions. It details the new streaming replication feature introduced in version 9.0, including the wal sender and receiver components and hot standby capability. Finally, it discusses capabilities, management tools, and future directions for replication.
Managing replication of PostgreSQL (Simon Riggs)
- 1. Managing PostgreSQL Replication © 2ndQuadrant Limited 2010
- 2. Who Am I? • Simon Riggs • Major Developer on PostgreSQL project • CTO, 2ndQuadrant © 2ndQuadrant Limited 2010
- 3. Replication Use Cases • High Availability • Protection • Total Cost of • Scalability Ownership • Exploiting success © 2ndQuadrant Limited 2010
- 4. Replication Mechanisms • Trigger-based replication – User space solution • Log-based replication – Integrated development © 2ndQuadrant Limited 2010
- 5. Log Shipping Developments • 8.0 – Point in Time Recovery, Full WAL info • 8.2 – Restartable Recovery, Log Switching, Streaming API • 8.3 – Full Page Optimization, pg_standby • 8.4 – BgWriter during Recovery • 9.0 – Streaming Replication Hot Standby © 2ndQuadrant Limited 2010
- 6. Streaming Replication (9.0) • Efficient real-time “log shipping” • Master → Slave replication using full security • Multiple concurrent slaves • Robust bi-modal design © 2ndQuadrant Limited 2010
- 7. WAL Sender © 2ndQuadrant Limited 2010
- 8. WAL Receiver © 2ndQuadrant Limited 2010
- 9. Hot Standby • Read-only access while “in recovery” • Equivalent of Oracle 11g Active Data Guard • Load balanced read scalability • Query off-load from main write node • Multiple highly available standby nodes © 2ndQuadrant Limited 2010
- 10. Capabilities • High Performance • Integrated • Ease of Use • Query Access • Relay • Selectivity • Query Farm © 2ndQuadrant Limited 2010
- 11. Capabilities with Tools • High Performance • Integrated • Ease of Use • Query Access • Relay • Selectivity • Query Farm © 2ndQuadrant Limited 2010
- 12. Repmgr © 2ndQuadrant Limited 2010
- 13. Repmgr • Simplify standby management • Monitor replication delays • Provide feedback mechanisms © 2ndQuadrant Limited 2010
- 14. Future: Sync Replication (9.1) • User-controlled robustness • High performance design • Simplicity • Additional flexibility through registration © 2ndQuadrant Limited 2010
- 15. Future: Loose Coupling • Allows distributed database • High Availability and Disaster Recovery • No shared resources – better scalability • “Cellular” approach © 2ndQuadrant Limited 2010
- 16. PostgreSQL Books • http://www.2ndQuadrant.com/books/ © 2ndQuadrant Limited 2010