Forum OpenACS Q&A: Re: Building a marketplace: NYSE, NASDAQ, CBOT
What about using solid state disks? You know, those devises that look like disks to the OS but are actually battery backed RAM. Wouldn't that have let you keep the Durability part of ACID, and yet maintain the much-faster-than-disks transaction rates?
So did the design end up using Rete nets in any way?
What real time database were you using, and how did you like it?
We designed this with fixed capacities in place (large capacity, but unchanging without restarting the application.) Like a reservoir, it has a fixed capacity or else it overflows. It was required to have a huge capacity, but it was fixed and knowing that number let us determine how large to create and preallocate various tables that an RDBMS would not demand you create or preallocate.
We had A, C, I in memory and hardcoded in the code, and the D was to bubble up from the rest of the system we would put in place to meet the required system uptime. I believe this is analogous to how many OODBM systems can work for you.
In a non real-time basis, as system demand permitted, sweeps through our object model were to stream into a traditional database to permit analysis and reporting and things like that and to clean up memory.