Replication
===========

EDB Postgres Extended Server provides the core functionality to support
the following replication and high availability features in
 :ref:`EDB Postgres Distributed </pgd/latest>`  :

-  Commit At Most Once (CAMO)

-  Group commit

-  Eager replication

-  Decoding worker

-  Assessment tooling

-  Lag tracker

-  Lag control

-  Timestamp snapshots

-  Transaction streaming

-  Missing partition conflict

-  No need for UPDATE trigger on tables with TOAST

-  Automatically hold back FREEZE

Asynchronous processing
-----------------------

EDB Postgres Extended Server includes a
``synchronous_replication_availability`` parameter. A value of ``async``
for this parameter enables asynchronous processing when not enough
standby servers are available (when compared with the values as per
``synchronous_standby_names`` ). The behavior reverts to synchronous
replication when the required number of synchronous standby servers
reappear.