Re: Collection.size behavior

Lew <>
Sun, 04 May 2008 10:24:32 -0400
Kenneth P. Turvey wrote:

Several other APIs already exist for accessing database objects. I don't
think we really need another one. You might really find a database
backed collection to be a good interface for many operations.

Databases nicely combine huge key domains with (relatively) sparse key sets,
then add built-in storage and caching, remote accessibility, sophisticated
query capabilities and a soup?on of programmatic connectivity.

Even terabyte-scale stores draw their keys from domains with sagans and sagans
of possible values, so in that sense they're sparse while still being huge.
Serving that oxymoronic goal is what DBMSes do well, for varying degrees of well.

Some are even perfect for in-memory embedded work, scale permitting. Apache
Derby (Java DB) comes to mind.

These won't be a drop-in replacement for Collections, of course. They can map
to Collections readily enough, via JPA and such, but your app will necessarily
think in wider terms than mere keystore. So coding, deployment and operations
effort increases, but you do get a huge capability boost with a DBMS.


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