1. Unique Index: A unique index is a type of index that ensures that all values stored in the index key are unique. For example, if you have a table with a column that stores employee IDs, you can create a unique index on that column to ensure that no two employees have the same ID.
2. Bitmap Index: A bitmap index is a type of index that uses a bitmap to store the index keys. Each bit in the bitmap corresponds to a value in the index key. For example, if you have a table with a column that stores gender (male or female), you can create a bitmap index on that column to quickly find all the males or females in the table.
3. Composite Index: A composite index is a type of index that is made up of multiple columns. For example, if you have a table with columns for first name, last name, and age, you can create a composite index on those three columns to quickly find all the records with a particular combination of first name, last name, and age.
4. Function-Based Index: A function-based index is a type of index that is based on a function or expression. For example, if you have a table with a column that stores dates, you can create a function-based index on that column to quickly find all the records with a particular date range.
5. Spatial Index: A spatial index is a type of index that is used to quickly find records that are related to a particular location. For example, if you have a table with columns for latitude and longitude, you can create a spatial index on those columns to quickly find all the records that are within a certain distance of a particular location.