When Should I Use Raw SQL for Better Performance in My Rails Application?

Boosting Rails Performance with Raw SQL Queries

For complex queries involving substantial datasets, employing raw SQL can dramatically enhance performance, particularly on platforms like Heroku where request timeouts are a potential issue. Here's how to integrate raw SQL into your Rails application:

<code class="language-ruby">sql = "SELECT * FROM payment_details AS pd
JOIN projects AS p ON pd.project_id = p.id
UNION ALL
SELECT * FROM payment_errors AS pe
JOIN projects AS p ON pe.project_id = p.id
ORDER BY pd.created_at DESC, pe.created_at DESC"

records_array = ActiveRecord::Base.connection.execute(sql)</code>

This code snippet demonstrates:

1. A raw SQL query (sql) using UNION ALL to merge data from payment_details and payment_errors tables, joined with the projects table.
2. ActiveRecord::Base.connection.execute(sql) executes the query, returning the results as an array stored in records_array.
3. Individual records are accessible through iteration of records_array.

This method offers finer-grained control over database interactions, potentially resulting in faster query execution and improved application performance.

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