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HCWDave - 22 Sep 2005 19:08 GMT

Hi,

i have a requirement for building a file for each customer, a customer of
mine has. These files will be between 1 and 5 meg in size each. We could have
anywhere between a few and tens of thousands of files.

We wanted to keep an index loaded in memory which consists of the company
name, company number and the location if their file. Does anyone have any
suggesstions as to the best way to keep this index. Originally I was going to
use an arraylist but i am now reading about the new dictionaries in .Net 2.0.
Initially this index will grow very quickly but once the system is
established it might only grow by 20 or 30 records a day.

SQL is not an option.

Thanks,
Dave

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Jon Skeet [C# MVP] - 22 Sep 2005 19:17 GMT

> i have a requirement for building a file for each customer, a customer of
> mine has. These files will be between 1 and 5 meg in size each. We could have
[quoted text clipped - 6 lines]
> Initially this index will grow very quickly but once the system is
> established it might only grow by 20 or 30 records a day.

A simple Hashtable would be fine, I'd have thought, mapping from name
to company record - or number to company record.

Dictionaries themselves have been in .NET from the start - it's just
that they become strongly typed in 2.0 with generics.

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Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
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HCWDave - 22 Sep 2005 19:27 GMT

Thanks for the quick response Jon.

Do you know an upper limit for a hastable where performace and searching
starts to degrade?

> > i have a requirement for building a file for each customer, a customer of
> > mine has. These files will be between 1 and 5 meg in size each. We could have
[quoted text clipped - 12 lines]
> Dictionaries themselves have been in .NET from the start - it's just
> that they become strongly typed in 2.0 with generics.

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Jon Skeet [C# MVP] - 22 Sep 2005 19:39 GMT

> Thanks for the quick response Jon.
>
> Do you know an upper limit for a hastable where performace and searching
> starts to degrade?

Well, you can test it for yourself - but it'll be a very large number.
Unless you've got well over a million entries, I doubt that you'll see
any problem.

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Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

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HCWDave - 22 Sep 2005 19:47 GMT

You rock,

Thanks Again

> > Thanks for the quick response Jon.
> >
[quoted text clipped - 4 lines]
> Unless you've got well over a million entries, I doubt that you'll see
> any problem.

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