I know at least Microsoft's SQL Server allows you to simulate this by fixing a query plan: https://technet.microsoft.com/en-us/library/Cc917694.aspx https://tec

I know at least Microsoft's SQL Server allows you to simulate this by fixing a query plan: https://technet.microsoft.com/en-us/library/Cc917694.aspx https://technet.microsoft.com/en-us/library/Cc917694.aspx Having worked with SQL Server for years as a DBA, I've never had to use it once, but I was never working with databases over, say, 1 TB. So while we did encounter slow query problems, they could usually be resolved by introducing reliable indexes, and the performance cost of this was low.