sert or
update data which would result in duplicate entries will
generate an error.</p></dd>


<dt id="arg-method">method<a class="anchor" aria-label="anchor" href="#arg-method"></a></dt>
<dd><p>The name of the method to be used for the
index. Choices are <code>"btree"</code>, <code>"hash"</code>,
<code>"rtree"</code>, and <code>"gist"</code>. The default method is
<code>"btree"</code>, although <code>"gist"</code> should be the index of
choice for PostGIS spatial types (geometry, geography,
raster).</p></d