Does anyone know if the CPU can run w/out a fan (w/ some underclocking if necessary)? If so it'll be a great candidate for a 'quiet' 7-24 home ftp / http / games server... I thought about using XBox for that purpose too, but I think even its fans are pretty loud. Is it actually possible to custom make a decent (regular) PC for $200 anyways?
I think the difference between the hierarchical and relational databases is more of how you access data than how you store it nowadays. Relational databases are inherently not suited for storing sparse data sets as you said. However you can create indexes (which is hiearchical in nature) to increase read performance (with possible write performance degradation). In OORDBMS, you can create ref table columns to slve the problem of variable number of 'attributes'. On the other hand it seems lots of hierarchical DB systems (like LDAP) are implemented with relational databases in the back end. So the only major difference between relational and hierarchical database is the syntax used to access data, and lots of RDBMS vendors are starting to implement direct XML interfaces...:)
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Does anyone know if the CPU can run w/out a fan (w/ some underclocking if necessary)? If so it'll be a great candidate for a 'quiet' 7-24 home ftp / http / games server... I thought about using XBox for that purpose too, but I think even its fans are pretty loud. Is it actually possible to custom make a decent (regular) PC for $200 anyways?
I think the difference between the hierarchical and relational databases is more of how you access data than how you store it nowadays. Relational databases are inherently not suited for storing sparse data sets as you said. However you can create indexes (which is hiearchical in nature) to increase read performance (with possible write performance degradation). In OORDBMS, you can create ref table columns to slve the problem of variable number of 'attributes'. On the other hand it seems lots of hierarchical DB systems (like LDAP) are implemented with relational databases in the back end. So the only major difference between relational and hierarchical database is the syntax used to access data, and lots of RDBMS vendors are starting to implement direct XML interfaces... :)