SQL Query Optimization FAQs

Question 1

What is the benefit of using cursor-based pagination over OFFSET?

Accepted Answer

The skill explains how OFFSET scales poorly (O(n)) by scanning all skipped rows, and provides templates for implementing cursor-based pagination which maintains constant-time performance.

Question 2

How does it handle the N+1 query problem?

Accepted Answer

The skill identifies patterns where multiple queries are executed in a loop and provides refactoring solutions using eager loading, JOINs, or subquery optimizations to reduce database round-trips.

Question 3

Does this skill work with both PostgreSQL and MySQL?

Accepted Answer

Yes, it provides tailored optimization strategies, EXPLAIN plan analysis, and configuration parameters for both PostgreSQL (up to v17) and MySQL (up to v8.4).

Question 4

Can it help me identify missing indexes?

Accepted Answer

Absolutely. By analyzing query plans, it identifies Sequential Scans on large tables and suggests the specific index type—such as B-Tree, Composite, or GIN—to improve performance.

Question 5

Does it provide advice on database server configuration?

Accepted Answer

Yes, it includes recommendations for critical performance settings like work_mem and shared_buffers for PostgreSQL, and innodb_buffer_pool_size for MySQL.

SQL Query Optimization

About

Key Features

Use Cases

SQL Query Optimization

About

Key Features

Use Cases