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Configuring hardware during the design phase

More often than not we recommend a particular configuration of hardware while in the design phase. Later on, in 99% of the cases, we find the hardware is inadequate or more than necessary. Can you please let me a know a scientific way of doing this, maybe on the basis of tpmc? Moreover, I am currently developing a vendor-neutral health care management system on J2EE/Hibernate/Jboss/Oracle10g. I would like to know, as I am using an ORM tool (for the first time), what design steps I should take to optimize my Oracle database performance.

Unfortunately, I do not have an answer for you. In all of my years in this business, I have yet to see any scientific method (that was worth anything) to be able to size hardware adequately. Typically, the approach that works the best is to employ someone's services who has tons of experience with these sorts of things.

Oracle 10g does make the process easier with grid computing. Instead of buying one monster database server, purchase a few small Linux boxes and cluster the database with Oracle's Real Application Clusters (RAC). If this configuration is too small, add another node or two to the cluster. If the configuration becomes too big, remove a node from your cluster and devote that hardware to another project. It is this "computing on demand" model that is rapidly becoming attractive to businesses.

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