On Thu, Jan 25, 2018 at 08:21:43PM -0500, Stephen Frost wrote: > That's correct, which is why it's encouraged to have multiple replicas > configured when using synchronous replication. In v10, it's possible to > specify how many synchronous replicas are required to have acknowledged > a given transaction before a COMMIT is returned to the applicaiton. > Please review the documentation here: > > https://www.postgresql.org/docs/current/static/warm-standby.html#SYNCHRONOUS-REPLICATION Be careful about the performance impact if there is network latency between a primary and its standbys. One small correction to what Stephen says here. It is possible to define multiple synchronous standbys in v9.6. v10 has added the possibility to define quorum groups. Note that the grammar as been kept backward-compatible across versions. -- Michael
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