How to clear all cached items in Oracle

Question

I\'m tuning SQL queries on an Oracle database. I want to ensure that all cached items are cleared before running each query in order to prevent misleading performance result

Answer 1

I would contend that you would be presenting misleading result because you have cleared all the caches. The database in the real world, is only ever in that state once in its life. In fact, when performance testing, it's generally an accepted practice to run a query multiple times so that you can see the benefit of caching (and other optimizations).