In this chapter, you have seen that data is either replicated synchronously or asynchronously. However, this is not a global thing. To ensure good performance, PostgreSQL allows you to configure things in a very flexible way. It is possible to replicate everything synchronously or asynchronously, but in many cases you might want to do things in a more fine-grained way. This is exactly when the synchronous_commit setting is needed.
Assuming that synchronous replication has been configured (the application_name setting in the recovery.conf file as well as the synchronous_standby_names setting in the postgresql.conf file), the synchronous_commit setting will offer the following options:
- off: This is basically asynchronous ...
