<pre>>Hallo<br>><br>>First your question about index-handling of multi-geometries.<br>>The index handles the whole geometry as one big so in your case where<br>>the multi-parts are spread you will get a lot better performance if you<br>
>use st_dump to split the multi to several rows of single polygons and<br>>build an index on that. <br><br>Hi,<br><br>That work very well.<br><br>Always do index on the dumped version of geometries<br><br clear="all">
Now the query time is down to few minutes. :))<br><br>Dumping the geometry in single parts is definitively better for index.<br><br>Now I do some tests, as you suggest, to reduce the number of unknown.<br><br> <br>-- <br>
</pre>-----------------<br>Andrea Peri<br>. . . . . . . . . <br>qwerty אטלעש<br>-----------------<br><br>