What are the best practices for indexing in TypeORM?

What are the best practices for indexing in TypeORM?

When indexing in TypeORM, consider the following best practices: 1. Use indexes on frequently queried columns. 2. Avoid over-indexing as it can slow down write operations. 3. Use composite indexes for queries that filter on multiple columns. 4. Regularly analyze and optimize your indexes based on query performance.

Can you explain composite indexes a bit more?

Sure! Composite indexes are indexes that include multiple columns. They are useful when you often query using multiple fields together. For example, if you frequently filter by both 'firstName' and 'lastName', creating a composite index on both columns can significantly improve query performance.

How do I create an index in TypeORM?

To create an index in TypeORM, you can use the @Index decorator in your entity class. For example: @Index('idx_name', ['firstName', 'lastName']) above your entity property will create a composite index on those fields.

What should I avoid when indexing?

Avoid indexing columns that are rarely queried, as this can lead to unnecessary overhead. Also, be cautious with indexing large text fields or columns with high cardinality, as they can increase the size of your index significantly.