Question 1

How do I use ActiveRecord Analyze to find missing indexes?

Accepted Answer

Run the `analyze` method on a slow query and check for 'Seq Scan' in the output or high 'Plan Rows' vs 'Actual Rows'—this indicates full table scans where indexes could help. Add indexes based on the filter conditions shown in the verbose output.

Question 2

ActiveRecord Analyze vs. bullet gem for Rails query optimization?

Accepted Answer

ActiveRecord Analyze provides detailed PostgreSQL execution plans for individual queries to identify bottlenecks like scans, while Bullet gem focuses on detecting N+1 queries and unused eager loading automatically. Use Analyze for deep performance tuning; use Bullet for catching common inefficiencies in development.

Question 3

Can I visualize query plans with ActiveRecord Analyze?

Accepted Answer

Yes, output the analysis in JSON format and paste it into visualization tools like PEV (PostgreSQL Explain Visualizer). The README includes an example image showing how JSON output can be used for graphical analysis.

Question 4

Is it safe to use ActiveRecord Analyze in production?

Accepted Answer

Use with caution: ANALYZE executes the query, which could impact performance or modify data if it's a write operation. It's best suited for development or staging environments, and the experimental nature means it might break with Rails upgrades.

Question 5

How to analyze raw SQL from logs with ActiveRecord Analyze?

Accepted Answer

Use the `ActiveRecordAnalyze.analyze_sql` method, passing the raw SQL string and optional format settings, as shown in the README example. This is helpful for debugging queries extracted from application logs without reconstructing Active Record objects.

Question 6

What are the performance costs of using EXPLAIN ANALYZE?

Accepted Answer

EXPLAIN ANALYZE runs the query fully, so it has the same performance impact as executing it normally—this can slow down your application if used on heavy queries in production. Always test in non-critical environments first.

activerecord-analyze

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