In which cases is it recommended to use indexing to speed up query performance in a database?

Indexing in a database is recommended in the following cases:

• When queries frequently use filter conditions (WHERE), especially on columns with a large number of unique values.
• When there are frequent sorting operations (ORDER BY) on certain fields.
• To speed up join operations (JOIN) on key columns.
• If the table contains a large amount of data and searching without indexes becomes slow.

Indexes help the database quickly find the needed records, reducing the number of rows scanned. However, excessive indexing can slow down insert, update, and delete operations, so indexes should be created consciously, based on actual queries.