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From Vijay <>
Subject Re: Table Index
Date Mon, 06 Jul 2009 23:31:31 GMT
Thanks Sandeep for your response,
but how do i get to the data, when i dont know the rowid? i have a unique
value which i am querying for in the table.... but i dont know the
ROWNAME..... Is there a way? or should i just create another table and store
the name in there?

"The indexing you see in the code is just a mechanism to get at the
(known) keys and columns quickly."  I saw your presentation in NOSQL meet in
which you said something about supercoulmn that was intresting.... but in
your presentation rowid was the usernames of who intracted?

The reason i am asking is i have multiple columns which a user can query on
like UID, URL, TAGS (all of them are unique).... but how can i get to them
without getting stuck with the rowid? coz rowid can be one of those.... and
the user at any time can know only one....

Thanks for your time....


On Mon, Jul 6, 2009 at 4:17 PM, Sandeep Tata <> wrote:

> Cassandra does not currently have secondary indexes.
> The indexing you see in the code is just a mechanism to get at the
> (known) keys and columns quickly.
> On Mon, Jul 6, 2009 at 3:59 PM, Vijay<> wrote:
> > Hi,
> > I think this is a very simple question and might have been asked
> before....
> > but couldn't find answer elsewhere.... Sorry if it is repetitive. We are
> > trying to use Cassandre and i am stuck in the datamodel.....
> > Do we have indexed table? i see some classes but dont know what they will
> be
> > used for.... Is the index tell Casandra where exactly the column and the
> > value in the column family is located? Say i do a query for which i dont
> > have the rowid, i am looking for and i want to get a value of a coumn
> with a
> > specific value.... will the secoundry index help on it? or should i use
> > lucene to do that?
> > What exactly the index will do and help on?
> > Thanks in advance.... May be i am confused because my understanding is
> > completely wrong abt the index.
> > Regards,
> > </VJ>

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