What are the best practices for indexing in Active Record?

What are the best practices for indexing in Active Record?

When indexing in Active Record, consider the following best practices: 1. Index columns that are frequently queried. 2. Use composite indexes for multi-column queries. 3. Avoid indexing columns with low cardinality. 4. 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 the performance implications of too many indexes?

Having too many indexes can slow down write operations, as each insert, update, or delete must also update the indexes. It's important to balance read and write performance.

Can I remove an index if it's not being used?

Yes, you can remove an unused index using the remove_index method in a migration. It's a good practice to periodically review and clean up unused indexes.