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Before you use a cursor, evaluate how the data will be consumed.Sometimes business cases can be made to have the data manipulated on the middle tier as opposed to the data tier.Subtle errors Cursors sometimes introduce subtle errors.We already looked at a few: However, there are also subtle errors that a cursor can introduce.
It's these cursor rewrites that lead to the impression that cursors are evil – or cursed.(See this example.) Trends come and go, but your DB strategy shouldn’t be a flavor of the month.Learn why you shouldn’t get distracted by new DB technology, how Facebook is using a RDBMS to do the data slicing and dicing they can’t in Hadoop, and more.Resources consumed by cursors As I mentioned earlier, a cursor is a memory resident set of pointers -- meaning it occupies memory from your system that may be available for other processes.Poorly written cursors can completely deplete available memory.