Replication solution comparison

Replication is very much an area where there is no one-size fits all solution. You need to match the solution chosen to what your specific problems and prioritization are. The main replication options break down based on what method they use to replicate and whether that replication is synchronous or not:

Program	Replication method	Synchronization
WAL shipping	Master/slave	Asynchronous
Logical replication	Master/slave	Asynchronous
Slony	Master/slave	Asynchronous
Londiste	Master/slave	Asynchronous
Mammoth	Master/slave	Asynchronous
Bucardo	Master/slave or Master/master	Asynchronous
Rubyrep	Master/slave or Master/master	Asynchronous
PgCluster	Master/master	Synchronous
Postgres-XC	Master/master	Synchronous
pgpool-II	Statement-based middleware	Synchronous

The...