In which cases is it advisable to delete indexes from a database?

Indexes in a database should be removed in the following cases:

• If the index is not used in queries, meaning it does not provide any benefit but occupies space and slows down write operations.
• When an index duplicates another index with the same or similar columns.
• If the data structure or business logic has changed, and the index has become outdated.
• During performance optimization: too many indexes slow down insertions, updates, and deletions.

Removing unused or redundant indexes helps reduce system load and speeds up write operations.