index c753d8005acd49e0f07fd3cb0f5b984338646e3b..22d8ad1aac43b38a119780da45de0159af6c6062 100644 (file)
<title>Index Methods and Operator Classes</title>
<para>
- The <classname>pg_am</classname> table contains one row for every
- index method (internally known as access method). Support for
- regular access to tables is built into
- <productname>PostgreSQL</productname>, but all index methods are
- described in <classname>pg_am</classname>. It is possible to add a
- new index access method by writing the necessary code and
- then creating an entry in <classname>pg_am</classname> — but that is
- beyond the scope of this chapter (see <xref linkend="indexam"/>).
+ Operator classes are associated with an index access method, such
+ as <link linkend="btree">B-Tree</link>
+ or <link linkend="gin">GIN</link>. Custom index access method may be
+ defined with <xref linkend="sql-create-access-method"/>. See
+ <xref linkend="indexam"/> for details.
</para>
<para>