postgresql集羣方案選型

High Availability, Load Balancing, and Replication Feature Matrix

Feature	Shared Disk Failover	File System Replication	Hot/Warm Standby Using PITR	Trigger-Based Master-Standby Replication	Statement-Based Replication Middleware	Asynchronous Multimaster Replication	Synchronous Multimaster Replication
Most Common Implementation	NAS	DRBD	PITR	Slony	pgpool-II	Bucardo
Communication Method	shared disk	disk blocks	WAL	table rows	SQL	table rows	table rows and row locks
No special hardware required		•	•	•	•	•	•
Allows multiple master servers					•	•	•
No master server overhead	•		•		•
No waiting for multiple servers	•		•	•		•
Master failure will never lose data	•	•			•		•
Standby accept read-only queries			Hot only	•	•	•	•
Per-table granularity				•		•	•
No conflict resolution necessary	•	•	•	•			•