Great idea!<br><br><div><span class="gmail_quote">On 1/14/07, <b class="gmail_sendername">Nick Hill</b> <<a href="mailto:nick@nickhill.co.uk">nick@nickhill.co.uk</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Let's hold back on dropping the coastline at least for today; given the database<br>is so slow, perhaps people wouldn't mind me taking it offline to try database<br>partitioning, at least for nodes and GPS points. I may take it offline at around
<br> 15:00 GMT.<br><br><br><br>Ray Booysen wrote:<br>> On that note, as the coastline import is pretty much automatic, should<br>> we delete the coastlines for africa until we can move to the tile based<br>> index. Its not very important to have the coastline import currently
<br>> and that should aleviate the issues for the time being. I've spoken to<br>> the other Africa coastline importer (Firefishy) and he agrees that we<br>> should do this. Between the two of us, large portions of the east and
<br>> west of Africa have been done, but both of these can be re-imported at a<br>> later date.<br>><br>> Also, our imports finished right at the beginnning of January and we<br>> have stopped imports until these other issues can be sorted out first.
<br>><br>> Comments? :)<br>><br>> Thanks<br>> Ray<br>><br>> On 1/14/07, *Nick Hill* <<a href="mailto:nick@nickhill.co.uk">nick@nickhill.co.uk</a><br>> <mailto:<a href="mailto:nick@nickhill.co.uk">
nick@nickhill.co.uk</a>>> wrote:<br>><br>> Looking at the disc usage for the db, 10% of the hard disc was<br>> filled with data<br>> between 29th Dec and 5th Jan. This represents 4Gb of data, including
<br>> indexes,<br>> which represents a 25% increase in the total OSM data set.<br>><br>> I have taken a look at the Africa coastline. It is very detailed,<br>> and looks like<br>> it even details mangrove swamps etc. So it is not beyond possibility
<br>> this<br>> increase in data set is caused by African coastline.<br>><br>> This could cause a substantial hit for queries hitting Europe. Our<br>> database<br>> currently narrows the index down on either lat or lon, not both.
<br>> Therefore,<br>> look-ups for Europe may require brute force searches to remove the<br>> African<br>> coastline from the indexed dataset. That would impact performance<br>> until we move
<br>> to a tile based index.<br>><br>><br>><br>><br>><br>><br>><br>> Nick Hill wrote:<br>> > It is still worrying me how the database load has shot up on 30th<br>> December. This
<br>> > inevitably causing slowness.<br>> ><br>> > When did the Africa coastline import run from/to?<br>> > How many points were involved?<br>> > Was there any publicity of OSM on that day which could have led
<br>> to a significant<br>> > increase in users? Would this result in this profile of usage ?<br>> (I think not but<br>> > prepared to debate it).<br>> ><br>> > Steve, did you make any changes to the API or DB set-up around
<br>> that time?<br>> ><br>> ><br>> ><br>> ><br>> > Andy Robinson wrote:<br>> ><br>> >> I thought it was probably the Africa Coastline stuff too. We had
<br>> nearly half<br>> >> a million node writes a day going in earlier in the week, but as<br>> you point<br>> >> out that situation has declined now. The only other thing that<br>
> springs to<br>> >> mind is Steve's mapnick db rendering. I'm assuming that's coming<br>> off the db<br>> >> direct rather than using the last planet. If this is the case I
<br>> presume then<br>> >> it will take a while for the first run of tiles to be completed,<br>> after that<br>> >> the load should drop of course.<br>> ><br>> > _______________________________________________
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http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk</a><br>><br>><br>><br>><br>> --<br>> Ray Booysen<br>> <a href="mailto:raybooysen@rjb.za.net">raybooysen@rjb.za.net</a> <mailto:<a href="mailto:raybooysen@rjb.za.net">
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</div><br><br clear="all"><br>-- <br>Ray Booysen<br><a href="mailto:raybooysen@rjb.za.net">raybooysen@rjb.za.net</a>