[mkgmap-dev] creating precompiled boundaries with Derby DB?

Mon Feb 20 19:55:35 GMT 2012

Hi WanMil,

okay, accepted. When I wrote this I got the impression that it could be done
with < 100 lines of code, 
but I did not think about the complex call path of BoundaryElementSaver
which makes it quite 
complicated to find a good place for the creation of the sql connection. 

Gerd

WanMil wrote
> 
> Hi Gerd,
> 
> I don't veto against that but I don't see the big reason for that. 
> Preparing boundaries must not be performed by anyone because they are 
> downloadable on some sites. If you really like to create your own 
> boundaries you can split the planet file into smaller pieces and merge 
> them afterwards.
> So in the end you have quite a lot of development work but not a big 
> improvement. I think there are more important things to be reworked.
> 
> But that's just my singular opinion.
> 
> WanMil
> 
>> Hi,
>>
>> would it be okay to change the BoundaryPreparer so that it (optionally)
>> stores data in a Derby DB instead of keeping everything on the heap?
>> http:////http://www.oracle.com/technetwork/java/javadb/overview/index.html
>> Java DB
>>
>> Due to the growth of the OSM data I can no longer create europe *.bnd
>> files
>> with -Xmx2800m (which seems to be the max. value on my machine)
>> I think the current process of extracting boundary data with osmconvert
>> and
>> osmfilter is already quite complex, and maybe a simple DB will help.
>> The idea: The BoundaryElementSaver could store the data in a DB(maybe
>> only
>> the coord data).
>> This would allow to create the *.bnd files with less than 1GB of memory.
>>
>> Any objections against this?
>>
>> Gerd
>>
>>
>>
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