January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Synchronous replication
Streaming replication is asynchronous by default. This means that if a user commits a transaction on the master, it gets the confirmation of the commit immediately, and the replication will happen only afterward. In case the master crashes right after a commit and the WAL records were not sent yet, the data will be lost, although the user has seen the commit was successful.
When high availability is a requirement in the sense that no data loss is acceptable, streaming replication can be set to synchronous mode.
To enable it on the master, in the postgresql.conf file, the synchronous_standby_names configuration parameter should be set to the name that identifies the standby server, for example, synchronous_standby_names ...
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