Can you list the main types of indexes used in database management systems?

Main types of indexes in database management systems:

• B-Tree index: the most common type, suitable for fast searches, sorting, and range queries.
• Hash index: efficient for exact key searches but does not support range queries.
• Bitmap index: used for columns with a small number of unique values, well-suited for analytical queries.
• Full-text index: designed for quick text searches, for example, in documents or articles.
• Spatial index: for working with geographic data and spatial queries.

Each type of index is optimized for specific tasks and query types; the choice depends on the data structure and performance requirements.