to allow the transaction to commit asynchronously. However, the

special value <literal>local</> is available for transactions that

wish to wait for local flush to disk, but not synchronous replication.

If <varname>synchronous_standby_names</> is not set, <literal>on</>,

<literal>remote_write</> and <literal>local</> provide the same

synchronization level; transaction commit only waits for local flush.

</para>

<para>

This parameter can be changed at any time; the behavior for any