<term><option>--pgdata <replaceable class="parameter">datadir</replaceable></option></term>
<listitem>
<para>
- Specifies the file system location of the database files. If
+ Specifies the file system location of the database configuration files. If
this is omitted, the environment variable
<envar>PGDATA</envar> is used.
</para>
<term><option>-D <replaceable class="parameter">datadir</replaceable></option></term>
<listitem>
<para>
- Specifies the file system location of the data directory or
- configuration file(s). See
+ Specifies the file system location of the database
+ configuration files. See
<xref linkend="runtime-config-file-locations"> for details.
</para>
</listitem>
</para>
<para>
-All the data needed for a database cluster is stored within the cluster's data
+Traditionally, the configuration and data files used by a database
+cluster are stored together within the cluster's data
directory, commonly referred to as <varname>PGDATA</> (after the name of the
environment variable that can be used to define it). A common location for
<varname>PGDATA</> is <filename>/var/lib/pgsql/data</>. Multiple clusters,
<filename>postgresql.conf</filename>, <filename>pg_hba.conf</filename>, and
<filename>pg_ident.conf</filename> are traditionally stored in
<varname>PGDATA</> (although in <productname>PostgreSQL</productname> 8.0 and
-later, it is possible to keep them elsewhere).
+later, it is possible to place them elsewhere).
</para>
<table tocentry="1" id="pgdata-contents-table">