I have a weird situation. During our test phase, from a test environment which is practically the same as the production, everything went ok. We have this SQL, which has always executed in a flash. Basically, the SQL select is instant. So, during all of our tests, we never saw anything wrong in there as it immediately executes. However, once we moved that to production, the same SQL select takes between two and five minutes. As I said, the data load is pratically the same. Anyone would be able to suggest what could be a factor here?