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| Subject: | Re: MobileLBSList: Looking for feedback..... |
| Date: |
08/15/2000 05:28:12 PM |
| From: |
Geoff Hendrey |
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specificall, if you look at spatial database products, they performed fixed (indeed require tuning to optimize tesselation level)
quadtree on loaded data. they do not assume the data is moving. if the data is moving, the tesselation losses its value very quickly as
you update indexes into tiles that no longer reflect the geometric distribution of users. retiling the DB is to slow to do on the fly
in a real deployment. if you want real scalability, you need an alternative to a traditional relational database or spatial database
built on fixed tiling. Remember, scalability does not mean it works just fine now because now you have few users and their
locations are not being updated with high frequency. As snaptrack-style systems become deployed, or even HLR based systems,
it will be critical to be able to perform queries like "fine all users near all my wallmart stores within 1Km" which
will involve querying the locations of millions of mobile users... |
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