Kuidas hinnata indeksit enne selle tootmisse lisamist tõhusust ja kasulikkust?

To evaluate the effectiveness and usefulness of an index before adding it to production, you can:

• Analyze the query execution plan (EXPLAIN or EXPLAIN ANALYZE) to understand how the index will affect search performance.
• Use test data similar to production data and run typical queries with and without the index, measuring execution time.
• Assess the impact on write operations: indexes slow down inserts and updates, so understanding the trade-off is important.
• Check the index's selectivity — how well it filters data.

Example in PostgreSQL:

EXPLAIN ANALYZE SELECT * FROM orders WHERE customer_id = 123;
-- Add index
CREATE INDEX idx_customer_id ON orders(customer_id);
EXPLAIN ANALYZE SELECT * FROM orders WHERE customer_id = 123;

By comparing the results, you can see how much the index sped up the queries and evaluate its usefulness.