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From Ric Wang <wqt.w...@gmail.com>
Subject Re: scanner on a given column: whole table scan or just the rows that have values
Date Wed, 10 Jun 2009 04:44:05 GMT
Hi,

Thanks. But if it is still scanning EVERY row in the entire table, how does
HBase achieve better scan performance, compared to a row-based database?

Thanks,
Ric



On Tue, Jun 9, 2009 at 9:35 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:

> Without the use of indexes, there is no easy way to get the info without
> touching every row.
>
> So yes you'll be scanning every row.  But hbase has good bulk scan perf.
>
> On Jun 9, 2009 7:24 PM, "Ric Wang" <wqt.work@gmail.com> wrote:
>
> How does the scanner know how to get ONLY the "relevant" rows, without a
> whole table scan?
>
> Thanks!
> Ric
>
> On Tue, Jun 9, 2009 at 4:31 PM, Naveen Koorakula <naveenk@gmail.com>
> wrote:
> > The scanner only s...
> --
>
> Ric Wang wqt.work@gmail.com
>



-- 
Ric Wang
wqt.work@gmail.com

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