Need advice! OODB vs RDBMS

Hello,

For school I am doeing a research on the preformance differences on databases when used in webservers.

What I am doeing is realy simple. Make 2 databases. 1 mysql and 1 db4o database and try to program the webserver as good as possible for both databases. However I need some proffecional advice. I want to make this test as valid and accurate as possible so I need to know what would be an good amount of testdata?

The website I want to test on will be some imaginary online profile website, like Facebook or mySpace. The amount of data I have right now is 50000 Persons that all together have 2.800.000+ friends(so reference to the same table) These persons all have a profile picture and have 5 pictures each profile wich makes in total a 300.000 pictures.

This all is running on 1 single computer with 3gb ram and a core2duo of 2ghz.

Is this amount of data enough for such a configuration or do I need more and where can I find(reference to my project) that this can be valid amount of data.

Greets

That sounds like a reasonable test to me, but I would recommend doing more than one size of test (preferably also one much smaller, and one much larger), and of course running each one multiple times to average out any anomalies.

You can then make a much more accurate analysis, and determine if the size of the data set makes a difference.