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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Logical replication
Logical replication allows us to stream logical data changes between two nodes. By logical, we mean streaming changes to data without referring to specific physical attributes such as a block number and row ID.
The main benefits of logical replication are as follows:
- Performance is roughly two times better than that of the best trigger-based mechanisms
- Selective replication is supported, so we don't need to replicate the entire database (only available with pglogical at present)
- Replication can occur between different major releases, which can allow a zero-downtime upgrade
PostgreSQL 9.4 onwards provides a feature called logical decoding. This allows you to stream a set of changes out of a master server. This allows ...
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