Re: In-memory database (was: big, fast, etc, was is Vax addressing sane today)

Thomas Koenig <tkoenig@netcologne.de> writes:

Anton Ertl <anton@mips.complang.tuwien.ac.at> schrieb:

Thomas Koenig <tkoenig@netcologne.de> writes:

The minimum requirement of SAP HANA is 64 GB of memory, but typical
ranges are from 256GB to 1TB.

>
What is the relevance of SAP HANA for the topic at hand?

>
It is something that is implemented, unlike what you were discussing.

So what? Linux is also implemented, and it runs on a 32GB machine.

Neither Linux nor SAP HANA satisfy even the most basic requirement
that I outlined (keeping balances) without additional implementation
work.  And I doubt that if you give a 15 year old Dual-Xeon even with
64GB of RAM and a bunch of HDDs to a typical SAP developer, he will
implement a system that manages to keep the balance on 1.8M (double
the number for double RAM capacity) credit cards at 56K transactions
per second on that system.  What I described is relatively
straightforward to implement on top of Linux.

- anton
--
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
  Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>