Developer SQL Copilot

Audience

Backend developers (Java, Go, and similar) who write SQL every day but don’t need to become database optimization experts.

Problem

A query that returns in milliseconds in development (tens of thousands of rows) can become a bottleneck in production (tens to hundreds of millions of rows). Consider an order query:

SELECT order_id, customer_id, order_status, create_time, total_amount
FROM orders
WHERE DATE(create_time) = '2026-09-04'
  AND customer_id = 10086
ORDER BY create_time DESC;

DATE(create_time) wraps the filter column in a function, preventing the optimizer from efficiently using an index on create_time and widening the scan. Developers typically don’t check for these issues while writing SQL — execution plans, index structure, optimizer behavior, and predicate selectivity aren’t part of their daily work.

Goal

Find and fix SQL performance risks before the code is committed, so problems stop at development instead of surfacing in production months later.

Workflow

Developer SQL Copilot brings database performance analysis directly into the development workflow: The whole flow happens inside the existing development process — developers don’t need to switch tools.

Dependencies

Built from the following capabilities (see each capability page for rewrite rules and index-design logic):

SQL Quality Check

Query Rewrite

Index Recommendation

Execution Plan Analysis

Performance Validation

Success Criteria

Metric	Objective
SQL issues found during development	Increase
SQL issues discovered after deployment	Decrease
Average SQL optimization turnaround time	Decrease
Developer-to-DBA consultation requests	Decrease
Production slow queries caused by new releases	Decrease

Beyond Generating SQL

Many AI coding assistants focus on “how do I write this SQL?”. But production-grade SQL also needs to answer:

Will this use the right index? Will it still perform on a hundred million rows? Is there a better rewrite? What index should I add? Is the execution plan reasonable? Is it actually faster after optimization?

Developer SQL Copilot’s value is here — it doesn’t just generate SQL; it analyzes, rewrites, and validates against database semantics and the optimizer.