What types of fields in PostgreSQL are usually indexed to speed up searches?

In PostgreSQL, fields with data types that are frequently used in search or sorting operations are usually indexed to speed up searches. Most commonly, these are:

• INTEGER, BIGINT, SMALLINT — numeric fields, such as identifiers.
• TEXT, VARCHAR — text fields, especially if searches are performed using the LIKE operator or full-text search.
• DATE, TIMESTAMP — timestamps for quick date-based searches.
• UUID — unique identifiers.

Indexes are created on fields that are often used in WHERE conditions, JOINs, or ORDER BY clauses to accelerate data access.

Example of creating an index:

CREATE INDEX idx_users_email ON users(email);