Zhang,
You'll have better luck posting this question on the postgis-users
mailing list; this list is for development of the core PostgreSQL
database. The subscription page for postgis-users is here:
http://postgis.refractions.net/mailman/listinfo/postgis-users
Briefly though, at least Oracle, PostgreSQL, IBM DB2, and Informix
can be configured to store, manipulate, and index geometry types in the
database. These are the key features of a spatial database. Support
for these capabilities in MySQL seems to be under development. ArcSDE
is middleware which is sometimes used to store spatial data in a
non-spatial database.
-Dave Fuhry
zhang Jackie wrote:
> I am interesting in PostGis and postgreSQL and want to do something
> on it. My idea is to build a Spatial Database Cache to accelerate GIS
> applications .So I want to ask you some question and hope to get your
> answer.
> 1. As we all know, PostGis is a Spatial extention for PostGreSQL.
> And there are also some other products such as ArcSDE, Oracle Spatial
> .Have you ever do some performance comparison between them.If you have
> ever done such work,Could you give me some information on it. If not, is
> it because that you team did not care about performance and just
> concerned with correctness of the program. And if you can give me some
> materials on performance comparison on such Spatial Database extention
> including ArcSDE, Oracle Spatial ,MySQL ,etc.
> 2. Since Google Earth is lauched ,Many GIS systems are used by more
> and more people,so the important features of Software becomes more
> and more important,such as sacalibity, robust, stability,etc. Can you
> give me some information and papers on the bottleneck of these
> applications.Especially, are computing and I/O requirements very
> important and become bottlenecks,Of course, If you know some
> related solutions , you can mail me.
> I have searche lots of papers and get an overview of it. But I felt I
> did not figure out the truth. So I want to get some more accurate
> information on this field.
