Re: [sheflug] a- level questions need help and now ias

[Sammy <nospam [at] cableinet.co.uk>]

On Sun, 20 May 2001, you wrote:
> On Sat, May 19, 2001 at 09:56:02PM +0100, Sammy wrote:
> > I need a clear definition of recursion and cache memory and how it works
> 
> Getting sheflug to do your homework eh? :)
> 
crappy definition given to me by a crappy computer teacher.....
this for my exam on tuesday......

also anyone know about ias aka immediate access store?
not to sure what the book mean by that i am asumming it not the cpu registers?

> Recursion: defining a function in terms of itself, kind of. It's a bit like
> proof by induction. Don't confuse recursivity with iterative or functional
> programming - procedural and recursive function can be defined in either
> iterative or functional languages. If i was anal, I'll call them orthogonal.
> 
> Cacheing works on the priniciple that you use a small number of things
> often. So, the things you use often you keep nearby to increase the overall
> speed. Having a fast piece of RAM (for example) is expensive, whereas slow
> RAM is less expensive, so if you have a small area of fast RAM and a large
> area of slower RAM you can use a cacheing scheme to make best use of the
> small area (the cache). Lookup anything on microprocessor design -
> particularly virtual memory, translation lookaside buffers and opcode
> loading.
> 
> > and any pointer to database normalisation.
> 
> Anything on databases will cover it.
> 
> > please help i haven't got any decent difinition and am having problem with
> > normalisation
> 
> If a database is normal, it has a set of known properties - for example, no
> piece of information is repeated. So, if you have a database of customers,
> you don't store their name more than once. Normalisation is the process of
> taking a database design and making it normal - there are a set of rules
> which you follow to achieve normal forms (the degree of normality within the
> database).
> 
> Cheers,
> 
> Alex.
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