In addition to playing with the splitting algorithms, since you are compiling your own DLL, you can customize the R-Tree module for 2 dimensions -- i.e. hard-code it for 5 columns of data.
This would *roughly* be accomplished by replacing all occurrences of pRtree->nDim with (2) and replacing all occurrences of pRtree->nBytesPerCell with (24) and recompiling (don't forget to enable optimizations in MSVC). You will also have to comment out lines like: pRtree->nDim = (argc-4)/2; and pRtree->nBytesPerCell = 8 + pRtree->nDim*4*2; I have not tried this, but a quick review of the code implies this would create a version of the R-Tree module "hard-coded" to support 5 columns (or 2-dimensions) which should be a little faster. If you play with the database page size as was previously suggested, you may also want to try adjusting the RTREE_MAXCELLS #define (although it's not clear to me how this would affect performance). -Shane _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
