What advantages does using a hash index in PostgreSQL database provide?

Hash indexes in PostgreSQL provide fast access to data for exact key searches. Main advantages:

• Fast exact value search: Hash indexes are optimized for equality operations (=), which speeds up data retrieval.
• Simple structure: Hash indexes use a hash function to quickly determine the location of a record.

However, it is important to note that in PostgreSQL, hash indexes are less versatile than B-tree indexes and do not support range queries or sorting. Also, in some versions, they may be less reliable and require additional maintenance.