What indexes are in PostgreSQL?

PostgreSQL offers several types of indexes, each optimized for different tasks:

• B-tree — the most common type, used for fast equality and range searches.
• Hash — an index for quick equality searches, but less versatile and less frequently used.
• GIN (Generalized Inverted Index) — effective for indexing arrays, JSONB, and full-text search.
• GiST (Generalized Search Tree) — a flexible index supporting various user-defined data types, such as geometric types.
• SP-GiST (Space-partitioned GiST) — for data structures with space partitioning, such as point data.
• BRIN (Block Range Index) — a compact index for large tables with ordered data, indexing block ranges.

The choice of index depends on the data type and the nature of the queries.