<title>Upgrading Data via Replication</title>

<para>

It is also possible to usecertain replication methods, such as

<productname>Slony</productname>, to create a standbyserver with the updated version of

<productname>PostgreSQL</productname>.This is possible becauseSlony supports

It is also possible to uselogical replication methods to create a standby

server with the updated version of <productname>PostgreSQL</productname>.

This is possible becauselogical replication supports

replication between different major versions of

<productname>PostgreSQL</productname>. The standby can be on the same computer or

a different computer. Once it has synced up with the master server

of downtime for an upgrade.

</para>

<para>

This method of upgrading can be performed using the built-in logical

replication facilities as well as using external logical replication

systems such as <productname>pglogical</productname>,

<productname>Slony</productname>, <productname>Londiste</productname>, and

<productname>Bucardo</productname>.

</para>

</sect2>

</sect1>