Re: What happened to Dali/Datablitz?

On Jul 2, 7:55 pm, Sune <sune_ahlg..._at_hotmail.com> wrote:  > I'm curious as to what happened to Dali/Datablitz. If I look for it on
> the net I don't find what I expect, such as manuals, product pages and
> so on?
>
> Does anyone know?

 Like TimesTen, and two or three other 'main memory database systems', they were shown in practice to be slower than commercial DBMS engines, and less reliable.

  A database is either too big to fit into memory, or it isn't. If it was too big for main memory (95% are) then these systems simply weren't useful at all.

  Beyond that, a database workload is either read-only, or read-write. When your database fits into main memory and your application involves write operations, you need transactions, which means disk operations. And that means main-memory DBMSs have no advantage anymore, even in theory. Twenty years of hand-polishing transaction management code makes commercial DBMS products superior.

 When your database fits into memory and your workload is readintensive,  the advantage of main-memory data structures over data structures intended for disk-and-memory is small. Having a rich feature, mature set (security, query optimization, good tooling) on the other hand becomes the deciding factor.

  Of course you can find benchmarks where one of the main memory DBMSs outperforms one of the commercial DBMSs. It's just that there weren't that many customers who's problem was the one benchmarked. Received on Sun Jul 08 2007 - 21:00:50 CEST