May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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Using replication slots
Replication slots allow you to define your replication architecture explicitly. They also allow you to track details of nodes even when they are disconnected. Replication slots work with both PSR and LSR, though they operate slightly differently.
Replication slots ensure that data required by a downstream node persists until the node receives it. They are crash-safe, so if a connection is lost, the slot still continues to exist. By tracking data on downstream nodes, we avoid these problems:
- When a standby disconnects, the feedback data provided by hot_standby_feedback is lost. When the standby reconnects, it may be sent cleanup records that result in query conflicts. Replication slots remember the standby's xmin
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