On Sep 15, 2009, at 4:11 PM, K. John Wu wrote:
> BEGIN Column > name=start > data_type=Unsigned > minimum=0 > maximum=100000000 > index=<binning begin=0 end=1e8 nbins=10000/><encoding interval- > equality/> > END Column > > (note: index specification must on one line in -part.txt) > > This index can handle i_begin and i_end that are multiples of 10,000 > efficiently. If you have "2000 < start < 78000" in a query, then the > index is insufficient to resolve this range condition, FastBit will > have to go back to the raw data. > > In the above example, the values 2000 and 78000 are multiples of 1000, > therefore, you can increase nbins to 100000 and keep bin boundaries at > the same resolution as the query boundaries. One follow up question: If nbins is 10000, does FastBit use the low resolution bins for 10000-70000 and the high resolution bins for 2000-10000 and 70000-78000? Andrew _______________________________________________ FastBit-users mailing list [email protected] https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users
