Descending Indexes

Answers to the quiz on Descending Indexes and hopefully some useful dangers and tips on using them. The answer to the first question is Yes, a “normal” Ascending Index can be used by the CBO to retrieve data in descending order and hence possibly avoid a sort. The reason being that leaf blocks in the [...]

OK, you won’t find the answer to these questions on my blog, so using my search facility won’t be of any help Actually, it’s quite an easy one this, honest If you have a query such as: SELECT * FROM bowie WHERE id BETWEEN 42 and 84 ORDER BY id DESC; 1) Can a default B-Tree index on [...]