When the Same Thing Isn’t
Things are not always as they appear. Remember the “spot the differences” pictures we pored over in our childhood? It’s hard enough finding the discrepancies when you know they’re there; it becomes infinitely harder if you believe two pictures are the same.
Comparison of Methods
There are times when it appears that the right metrics are in use and the right data has been captured, but still there is a problem. This happened a few years ago in our group when a number of us compared notes on our scalability measurements. We had been finding the maximum OLTP throughput with various numbers of CPUs on the same hardware platform and the same Solaris release but using different RDBMS products. In each case we first established ...
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