Hi, John can correct me if I'm wrong but I think it is because the indexes can be binned, so the actual value must be retrieved for the column.
--justin Sent from my iPhone > On Jul 4, 2015, at 9:47 AM, Mazen Kachmar <[email protected]> wrote: > > Dear John, > Thank you in advance for your time. I am bit of a novice in this area, so my > apologies for the quality of my question. I studied FastBit quite a bit in > the last couple of days and stepped through the tcapi example in particular. > Let me refine my question below a bit. > > It looks like FastBit needs to serialize the index information into the > filesystem. This is fine. However, I also noticed > that it also serializes a transformation of the original data as well (I was > looking at fastbit_add_values). Is this true? > If so, why is FastBit duplicating the original data (in a different form)? > In other words, why can't FastBit use the compressed index information to map > to the original data? > > Thank you, > Mazen > > From: [email protected] > To: [email protected] > Date: Fri, 3 Jul 2015 12:27:53 +0000 > Subject: [FastBit-users] Does FastBit need to use filesystem? > > Hi, > I was reading on https://sdm.lbl.gov/~kewu/fastbit/doc/quickstart.html that > FastBit partitions the data in a directory in the filesystem. Is this the > only way to use FastBit? In other words, can FastBit be used as an in-memory > data base? My data is in memory and I don't wish to serialize it to the hard > disk. > > Thanks, > Mazen > > _______________________________________________ FastBit-users mailing list > [email protected] > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > _______________________________________________ > FastBit-users mailing list > [email protected] > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users
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