</row>
<row>
+ <entry><link linkend="catalog-pg-extension"><structname>pg_extension</structname></link></entry>
+ <entry>installed extensions</entry>
+ </row>
+
+ <row>
<entry><link linkend="catalog-pg-foreign-data-wrapper"><structname>pg_foreign_data_wrapper</structname></link></entry>
<entry>foreign-data wrapper definitions</entry>
</row>
</varlistentry>
<varlistentry>
+ <term><symbol>DEPENDENCY_EXTENSION</> (<literal>e</>)</term>
+ <listitem>
+ <para>
+ The dependent object is a member of the <firstterm>extension</> that is
+ the referenced object (see
+ <link linkend="catalog-pg-extension"><structname>pg_extension</structname></link>).
+ The dependent object can be dropped only via
+ <command>DROP EXTENSION</> on the referenced object. Functionally
+ this dependency type acts the same as an internal dependency, but
+ it's kept separate for clarity and to simplify <application>pg_dump</>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><symbol>DEPENDENCY_PIN</> (<literal>p</>)</term>
<listitem>
<para>
</sect1>
+ <sect1 id="catalog-pg-extension">
+ <title><structname>pg_extension</structname></title>
+
+ <indexterm zone="catalog-pg-extension">
+ <primary>pg_extension</primary>
+ </indexterm>
+
+ <para>
+ The catalog <structname>pg_extension</structname> stores information
+ about the installed extensions. See <xref linkend="extend-extensions">
+ for details about extensions.
+ </para>
+
+ <table>
+ <title><structname>pg_extension</> Columns</title>
+
+ <tgroup cols="4">
+ <thead>
+ <row>
+ <entry>Name</entry>
+ <entry>Type</entry>
+ <entry>References</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><structfield>extname</structfield></entry>
+ <entry><type>name</type></entry>
+ <entry></entry>
+ <entry>Name of the extension</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extowner</structfield></entry>
+ <entry><type>oid</type></entry>
+ <entry><literal><link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.oid</literal></entry>
+ <entry>Owner of the extension</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extnamespace</structfield></entry>
+ <entry><type>oid</type></entry>
+ <entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
+ <entry>Schema containing the extension's exported objects</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extrelocatable</structfield></entry>
+ <entry><type>bool</type></entry>
+ <entry></entry>
+ <entry>True if extension can be relocated to another schema</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extversion</structfield></entry>
+ <entry><type>text</type></entry>
+ <entry></entry>
+ <entry>Version string for the extension, or <literal>NULL</> if none</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extconfig</structfield></entry>
+ <entry><type>oid[]</type></entry>
+ <entry><literal><link linkend="catalog-pg-class"><structname>pg_class</structname></link>.oid</literal></entry>
+ <entry>Array of <type>regclass</> OIDs for the extension's configuration
+ table(s), or <literal>NULL</> if none</entry>
+ </row>
+
+ <row>
+ <entry><structfield>extcondition</structfield></entry>
+ <entry><type>text[]</type></entry>
+ <entry></entry>
+ <entry>Array of <literal>WHERE</>-clause filter conditions for the
+ extension's configuration table(s), or <literal>NULL</> if none</entry>
+ </row>
+
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>
+ Note that unlike most catalogs with a <quote>namespace</> column,
+ <structfield>extnamespace</structfield> is not meant to imply
+ that the extension belongs to that schema. Extension names are never
+ schema-qualified. Rather, <structfield>extnamespace</structfield>
+ indicates the schema that contains most or all of the extension's
+ objects. If <structfield>extrelocatable</structfield> is true, then
+ this schema must in fact contain all schema-qualifiable objects
+ belonging to the extension.
+ </para>
+ </sect1>
+
+
<sect1 id="catalog-pg-foreign-data-wrapper">
<title><structname>pg_foreign_data_wrapper</structname></title>
<tbody>
<row>
+ <entry><link linkend="view-pg-available-extensions"><structname>pg_available_extensions</structname></link></entry>
+ <entry>available extensions</entry>
+ </row>
+
+ <row>
<entry><link linkend="view-pg-cursors"><structname>pg_cursors</structname></link></entry>
<entry>open cursors</entry>
</row>
</table>
</sect1>
+ <sect1 id="view-pg-available-extensions">
+ <title><structname>pg_available_extensions</structname></title>
+
+ <indexterm zone="view-pg-available-extensions">
+ <primary>pg_available_extensions</primary>
+ </indexterm>
+
+ <para>
+ The <structname>pg_available_extensions</structname> view lists the
+ extensions that are available for installation. This view can only
+ be read by superusers. See also the
+ <link linkend="catalog-pg-extension"><structname>pg_extension</structname></link>
+ catalog, which shows the extensions currently installed.
+ </para>
+
+ <table>
+ <title><structname>pg_available_extensions</> Columns</title>
+
+ <tgroup cols="3">
+ <thead>
+ <row>
+ <entry>Name</entry>
+ <entry>Type</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><structfield>name</structfield></entry>
+ <entry><type>name</type></entry>
+ <entry>Extension name</entry>
+ </row>
+
+ <row>
+ <entry><structfield>version</structfield></entry>
+ <entry><type>text</type></entry>
+ <entry>Version string from the extension's control file</entry>
+ </row>
+
+ <row>
+ <entry><structfield>installed</structfield></entry>
+ <entry><type>text</type></entry>
+ <entry>Currently installed version of the extension,
+ or <literal>NULL</literal> if not installed</entry>
+ </row>
+
+ <row>
+ <entry><structfield>schema</structfield></entry>
+ <entry><type>name</type></entry>
+ <entry>Name of the schema where the extension is installed,
+ or <literal>NULL</literal> if not installed</entry>
+ </row>
+
+ <row>
+ <entry><structfield>relocatable</structfield></entry>
+ <entry><type>bool</type></entry>
+ <entry>True if extension can be relocated to another schema</entry>
+ </row>
+
+ <row>
+ <entry><structfield>comment</structfield></entry>
+ <entry><type>text</type></entry>
+ <entry>Comment string from the extension's control file</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>
+ The <structname>pg_available_extensions</structname> view is read only.
+ </para>
+
+ </sect1>
+
<sect1 id="view-pg-cursors">
<title><structname>pg_cursors</structname></title>
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