What are the best practices for indexing in Rails?

What are the best practices for indexing in Rails?

When indexing in Rails, consider the following best practices: 1. Use database indexes wisely to speed up queries. 2. Index columns that are frequently used in WHERE clauses. 3. Avoid over-indexing, as it can slow down write operations. 4. Use composite indexes for queries that filter on multiple columns. 5. Regularly analyze and optimize your indexes.

How do I create an index in a Rails migration?

You can create an index in a Rails migration using the add_index method. For example: add_index :table_name, :column_name.

What are composite indexes and when should I use them?

Composite indexes are indexes on multiple columns. They are useful when you frequently query using multiple columns together, as they can significantly improve query performance.

Can you explain the impact of indexing on database performance?

Indexing can greatly improve read performance by allowing the database to find rows faster. However, it can slow down write operations, as the index needs to be updated with each insert, update, or delete.