Can an IT system (client/server or web based) exist without a persistent data re

Question

Can an IT system (client/server or web based) exist without a persistent data repository? If so how, and are there any caveats with this approach? If not why not- what are the reasons that make this difficult/impossible)?

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Explanation / Answer

Yes. An IT system can exist without persistent data repository. There are several in-memory(RAM) databases exists based on this approach. Redis, memcached are few to name. Though they support persistant storage as well, their core advantage exists the other way around. It uses RAM to store data, so it is very fast to access. Cookies, sessions are very good examples of data to store in such DataBases.

As RAM is easy to access and update faster, in-memory databases are doing really awesome work in managing flash data and session data. But there is other side for coin as well.

As it uses RAM to store data, eventually all the RAM will be used as number of entries increase. There exists replacement algorithms as well but we are compromising on data availability. And also as memory usage increases, there will be performance reduction.

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