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Postgres documentation
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<refentry id="APP-PGDUMP">
 <refmeta>
  <refentrytitle id="app-pgdump-title">
   <application>pg_dump</application>
  </refentrytitle>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   <application>pg_dump</application>
  </refname>
  <refpurpose>
   Extract a <productname>Postgres</productname> database into a script file
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1999-07-20</date>
  </refsynopsisdivinfo>
  <synopsis>
pg_dump [ <replaceable class="parameter">dbname</replaceable> ]
pg_dump [ -h <replaceable class="parameter">host</replaceable> ] [ -p <replaceable class="parameter">port</replaceable> ]
    [ -t <replaceable class="parameter">table</replaceable> ]
    [ -a ] [ -c ] [ -d ] [ -D ] [ -i ] [ -n ] [ -N ]
    [ -o ] [ -s ] [ -u ] [ -v ] [ -x ]
    [ <replaceable class="parameter">dbname</replaceable> ]
  </synopsis>

  <refsect2 id="R2-APP-PG-DUMP-1">
   <refsect2info>
    <date>1998-11-05</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <application>pg_dump</application> accepts the following command
    line arguments:

    <variablelist>
     <varlistentry>
      <term><replaceable class="parameter">dbname</replaceable></term>
      <listitem>
       <para>
	Specifies the name of the database to be extracted.
	<replaceable class="parameter">dbname</replaceable>
	defaults to the value of the
	<envar>USER</envar>
	environment variable.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-a</term>
      <listitem>
       <para>
	Dump out only the data, no schema (definitions).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-c</term>
      <listitem>
       <para>
	Clean (drop) schema prior to create.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-d</term>
      <listitem>
       <para>
	Dump data as proper insert strings.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-D</term>
      <listitem>
       <para>
	Dump data as inserts with attribute names
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-i</term>
      <listitem>
       <para>
        Ignore version mismatch between <application>pg_dump</application>
	and the database server.  Since <application>pg_dump</application>
	knows a great deal about system catalogs, any given version of
	<application>pg_dump</application> is only intended to work with
	the corresponding release of the database server.  Use this option
	if you need to override the version check (and if
	<application>pg_dump</application> then fails, don't
	say you weren't warned).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-n</term>
      <listitem>
       <para>
	Suppress double quotes around identifiers unless absolutely necessary.
	This may cause trouble loading this dumped data if there are reserved words
	used for identifiers. 
	This was the default behavior for
	<application>pg_dump</application> prior to v6.4.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-N</term>
      <listitem>
       <para>
	Include double quotes around identifiers.
	This is the default.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-o</term>
      <listitem>
       <para>
	Dump object identifiers (<acronym>OID</acronym>s) for every table.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-s</term>
      <listitem>
       <para>
	Dump out only the schema (definitions), no data.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-t <replaceable class="parameter">table</replaceable></term>
      <listitem>
       <para>
	Dump data for <replaceable class="parameter">table</replaceable> only.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-u</term>
      <listitem>
       <para>
	Use password authentication. Prompts for username and password.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-v</term>
      <listitem>
       <para>
	Specifies verbose mode.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-x</term>
      <listitem>
       <para>
	Prevent dumping of ACLs (grant/revoke commands) and table ownership information.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>
   <para>
    <application>pg_dump</application> also accepts 
    the following command line arguments for connection parameters:

    <variablelist>
     <varlistentry>
      <term>-h <replaceable class="parameter">host</replaceable></term>
      <listitem>
       <para>
	Specifies the hostname of the machine on which the 
	<application>postmaster</application>
	is running.  Defaults to using a local Unix domain socket
	rather than an IP connection.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-p <replaceable class="parameter">port</replaceable></term>
      <listitem>
       <para>
	Specifies the Internet TCP/IP port or local Unix domain socket file 
	extension on which the <application>postmaster</application>
	is listening for connections.  The port number defaults to 5432,
	or the value of the <envar>PGPORT</envar>
	environment variable (if set).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-u</term>
      <listitem>
       <para>
	Use password authentication. 
	Prompts for
	<replaceable class="parameter">username</replaceable>
	and <replaceable class="parameter">password</replaceable>.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>

  <refsect2 id="R2-APP-PG-DUMP-2">
   <refsect2info>
    <date>1998-11-05</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>
    <application>pg_dump</application> will create a file or
    write to <filename>stdout</filename>.

    <variablelist>
     <varlistentry>
      <term><computeroutput>
Connection to database 'template1' failed.
connectDB() failed: Is the postmaster running and accepting connections
            at 'UNIX Socket' on port '<replaceable class="parameter">port</replaceable>'?
       </computeroutput></term>
      <listitem>
       <para>
	<application>pg_dump</application> could not attach to the 
	<application>postmaster</application> 
	process on the specified host and port.  If you see this message,
	ensure that the <application>postmaster</application> 
	is running on the proper host and that you have specified the proper
	port.  If your site uses an authentication system, ensure that you
	have obtained the required authentication credentials.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><computeroutput>
Connection to database '<replaceable class="parameter">dbname</replaceable>' failed.
FATAL 1:  SetUserId: user '<replaceable class="parameter">username</replaceable>' is not in 'pg_shadow'
       </computeroutput></term>
      <listitem>
       <para>
	You do not have a valid entry in the relation <literal>pg_shadow</literal>
	and and will not be allowed to access <productname>Postgres</productname>. 
	Contact your <productname>Postgres</productname> administrator.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><computeroutput>
dumpSequence(<replaceable class="parameter">table</replaceable>): SELECT failed
       </computeroutput></term>
      <listitem>
       <para>
	You do not have permission to read the database.
	Contact your <productname>Postgres</productname> site administrator.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>

   <note>
    <para>
     <application>pg_dump</application> internally executes
     <command>SELECT</command> statements. If you have problems running
     <application>pg_dump</application>,
     make sure you are able to select information from the database using, for
     example, <application>psql</application>.
    </para>
   </note>
  </refsect2>
 </refsynopsisdiv>

 <refsect1 id="R1-APP-PG-DUMP-1">
  <refsect1info>
   <date>1998-11-05</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <application>pg_dump</application> is a utility for dumping out a 
   <productname>Postgres</productname> database into a script file
   containing query commands.  The script
   files are in text format and can be used to reconstruct the database,
   even on other machines and other architectures.  
   <application>pg_dump</application> 
   will produce the queries necessary to re-generate all
   user-defined types, functions, tables, indices, aggregates, and
   operators.  In addition, all the data is copied out in text format so
   that it can be readily copied in again, as well as imported into tools
   for editing.
  </para>

  <para>
   <application>pg_dump</application> 
   is useful for dumping out the contents of a database to move from one
   <productname>Postgres</productname> installation to another.  After running 
   <application>pg_dump</application>,
   one should examine the output script file for any warnings, especially
   in light of the limitations listed below. 
  </para>
 </refsect1>

 <refsect1 id="R1-APP-PG-DUMP-2">
  <refsect1info>
   <date>1998-11-05</date>
  </refsect1info>
  <title>
   Notes
  </title>
  <para>
   <application>pg_dump</application> has a few limitations.
   The limitations mostly stem from
   difficulty in extracting certain meta-information from the system
   catalogs.

   <itemizedlist>
    <listitem>
     <para>
      <application>pg_dump</application> 
      does not understand partial indices. The reason is
      the same as above; partial index predicates are stored as plans.
     </para>
    </listitem>

    <listitem>
     <para>
      <application>pg_dump</application> does not handle large objects.
      Large objects are ignored and must be dealt with manually. 
     </para>
    </listitem>

    <listitem>
     <para>
      When doing a data only dump, <application>pg_dump</application> emits queries
      to disable triggers on user tables before inserting the data and queries to
      re-enable them after the data has been inserted.  If the restore is stopped
      in the middle, the system catalogs may be left in the wrong state.
     </para>
    </listitem>

   </itemizedlist>
  </para>
 </refsect1>

 <refsect1 id="R1-APP-PG-DUMP-3">
  <refsect1info>
   <date>1998-11-05</date>
  </refsect1info>
  <title>
   Usage
  </title>
  <para>
   To dump a database of the same name as the user:

   <programlisting>
$ pg_dump > db.out
   </programlisting>
  </para>

  <para>
   To reload this database:

   <programlisting>
$ psql -e database < db.out
   </programlisting>
  </para>
 </refsect1>
</refentry>

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