In the context of databases, which type of index uses a separate data structure to store index key values along with pointers to the actual data rows?OptionsDense IndexHash IndexB-Tree IndexBitmap Index

The type of index that uses a separate data structure to store index key values along with pointers to the actual data rows in the context of databases is a B-Tree Index.

Here's a step-by-step explanation:

1. In a database, an index is used to speed up the retrieval of records. It works similarly to an index in a book.

2. A B-Tree index is a specific type of index that stores its entries in a B-Tree data structure.

3. The B-Tree data structure is a balanced search tree, which means it maintains its balance and provides for efficient insertion, deletion, and search operations.

4. In a B-Tree index, each node contains a set of keys and pointers. The keys act as separation values which divide its subtrees.

5. The pointers in the B-Tree index point to the actual data rows in the database. This is why it's said that a B-Tree index uses a separate data structure to store index key values along with pointers to the actual data rows.

6. Other types of indexes like Dense Index, Hash Index, and Bitmap Index also exist, but they use different methods and data structures to store and retrieve data.