Setting Index Type and Flags

The Index Type dropdown list defines the type of the table index. Oracle Database provides several indexing schemes.

Non-unique
Non-unique indexes do not impose the restriction of unique indexes on the column values.

Unique
Unique indexes guarantee that no two rows of a table have duplicate values in the key column (or columns).

Bitmap
In a bitmap index, a bitmap for each key value is used instead of a list of rowids.