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Managing
         PostgreSQL
         Replication



© 2ndQuadrant Limited 2010
Who Am I?
       • Simon Riggs
       • Major Developer on PostgreSQL project
       • CTO, 2ndQuadrant




© 2ndQuadrant Limited 2010
Replication Use Cases
       • High Availability   • Protection
                             • Total Cost of
       • Scalability             Ownership
                             • Exploiting success




© 2ndQuadrant Limited 2010
Replication Mechanisms
       • Trigger-based replication
                 – User space solution
       • Log-based replication
                 – Integrated development




© 2ndQuadrant Limited 2010
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
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
WAL Sender




© 2ndQuadrant Limited 2010
WAL Receiver




© 2ndQuadrant Limited 2010
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
Capabilities
       •   High Performance
       •   Integrated
       •   Ease of Use
       •   Query Access
       •   Relay
       •   Selectivity
       •   Query Farm


© 2ndQuadrant Limited 2010
Capabilities with Tools
       •   High Performance
       •   Integrated
       •   Ease of Use
       •   Query Access
       •   Relay
       •   Selectivity
       •   Query Farm


© 2ndQuadrant Limited 2010
Repmgr




© 2ndQuadrant Limited 2010
Repmgr
       • Simplify standby management
       • Monitor replication delays
       • Provide feedback mechanisms




© 2ndQuadrant Limited 2010
Future: Sync Replication (9.1)
       •   User-controlled robustness
       •   High performance design
       •   Simplicity
       •   Additional flexibility through registration




© 2ndQuadrant Limited 2010
Future: Loose Coupling
       •   Allows distributed database
       •   High Availability and Disaster Recovery
       •   No shared resources – better scalability
       •   “Cellular” approach




© 2ndQuadrant Limited 2010
PostgreSQL Books

       • http://www.2ndQuadrant.com/books/




© 2ndQuadrant Limited 2010

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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
  • 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
  • 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