On Feb 28, 5:48 am, "-CELKO-" <jcelko..._at_earthlink.net> wrote:
> I think he missed the point of RDBMS versus hierarchical databases.
>
> Yes, a hierarchical database like IMS (which has more data in it than
> all the SQL enterprise products combined) devoted to one job will run
> really fast. You tune for that one job. But it will not handle any
> other jobs very well.
And not so much faster to be really concerned. Consider:
- Extracting a set of records from a single table by some criteria.
There has to be a B-tree walk in both cases. Performance is the same.
- Extracting all children of a parent record by foreign key index
versus extracting children by direct references. Logarithmic cost
versus constant which is also not a big deal.
Received on Wed Feb 28 2007 - 11:43:36 CST
