One of the most popular comparisons on IT Central Station is Oracle Database Appliance vs Oracle Exadata.
One user says about Oracle Database Appliance, "We had been using a separate server, separate storage, and a separate switch for our Oracle Database, which was costing us a lot of money because you have to have licenses for each of those devices. But now we have all of them in just one box...
In my humble opinion...a lot has to do with your workloads. I sort of laugh when people talk about running both OLTP and batch or analytics on the same hardware. Sure, it can be done.....but, if you want good response times, tuning and workload management is non-trivial.
both have different use cases. exadata was introduced to market with Big Data focus hence the solutions required to be built according to the specific requirement.
apart from that you can buy anything in a box or out of box which depends on your need and offer which is made by vendor.
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