database-optimizer

name	database-optimizer
description	Optimizes database queries and improves performance across PostgreSQL and MySQL systems. Use when investigating slow queries, analyzing execution plans, or optimizing database performance. Invoke for index design, query rewrites, configuration tuning, partitioning strategies, lock contention resolution.
metadata	{"domain":"infrastructure","triggers":"database optimization, slow query, query performance, database tuning, index optimization, execution plan, EXPLAIN ANALYZE, database performance, PostgreSQL optimization, MySQL optimization","role":"specialist","scope":"optimization","output-format":"analysis-and-code","related-skills":"devops-engineer, postgres-pro, graphql-architect"}

Database Optimizer

Senior database optimizer with expertise in performance tuning, query optimization, and scalability across multiple database systems.

When to Use This Skill

• Analyzing slow queries and execution plans
• Designing optimal index strategies
• Tuning database configuration parameters
• Optimizing schema design and partitioning
• Reducing lock contention and deadlocks
• Improving cache hit rates and memory usage

Core Workflow

1. Analyze Performance — Capture baseline metrics and run EXPLAIN ANALYZE before any changes
2. Identify Bottlenecks — Find inefficient queries, missing indexes, config issues
3. Design Solutions — Create index strategies, query rewrites, schema improvements
4. Implement Changes — Apply optimizations incrementally with monitoring; validate each change before proceeding to the next
5. Validate Results — Re-run EXPLAIN ANALYZE, compare costs, measure wall-clock improvement, document changes

⚠️ Always test changes in non-production first. Revert immediately if write performance degrades or replication lag increases.

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
Query Optimization	references/query-optimization.md	Analyzing slow queries, execution plans
Index Strategies	references/index-strategies.md	Designing indexes, covering indexes
PostgreSQL Tuning	references/postgresql-tuning.md	PostgreSQL-specific optimizations
MySQL Tuning	references/mysql-tuning.md	MySQL-specific optimizations
Monitoring & Analysis	references/monitoring-analysis.md	Performance metrics, diagnostics

Common Operations & Examples

Identify Top Slow Queries (PostgreSQL)

-- Requires pg_stat_statements extension
SELECT query,
       calls,
       round(total_exec_time::numeric, 2)  AS total_ms,
       round(mean_exec_time::numeric, 2)   AS mean_ms,
       round(stddev_exec_time::numeric, 2) AS stddev_ms,
       rows
FROM   pg_stat_statements
ORDER  BY mean_exec_time DESC
LIMIT  20;

Capture an Execution Plan

-- Use BUFFERS to expose cache hit vs. disk read ratio
EXPLAIN (ANALYZE, BUFFERS, FORMAT TEXT)
SELECT o.id, c.name
FROM   orders o
JOIN   customers c ON c.id = o.customer_id
WHERE  o.status = 'pending'
  AND  o.created_at > now() - interval '7 days';

Reading EXPLAIN Output — Key Patterns to Find

Pattern	Symptom	Typical Remedy
Seq Scan on large table	High row estimate, no filter selectivity	Add B-tree index on filter column
Nested Loop with large outer set	Exponential row growth in inner loop	Consider Hash Join; index inner join key
cost=... rows=1 but actual rows=50000	Stale statistics	Run ANALYZE <table>;
Buffers: hit=10 read=90000	Low buffer cache hit rate	Increase shared_buffers; add covering index
Sort Method: external merge	Sort spilling to disk	Increase work_mem for the session

Create a Covering Index

-- Covers the filter AND the projected columns, eliminating a heap fetch
CREATE INDEX CONCURRENTLY idx_orders_status_created_covering
    ON orders (status, created_at)
    INCLUDE (customer_id, total_amount);

Validate Improvement

-- Before optimization: save plan & timing
EXPLAIN (ANALYZE, BUFFERS) <query>;   -- note "Execution Time: X ms"

-- After optimization: compare
EXPLAIN (ANALYZE, BUFFERS) <query>;   -- target meaningful reduction in cost & time

-- Confirm index is actually used
SELECT indexname, idx_scan, idx_tup_read, idx_tup_fetch
FROM   pg_stat_user_indexes
WHERE  relname = 'orders';

MySQL: Find Slow Queries

-- Inspect slow query log candidates
SELECT * FROM performance_schema.events_statements_summary_by_digest
ORDER  BY SUM_TIMER_WAIT DESC
LIMIT  20;

-- Execution plan
EXPLAIN FORMAT=JSON
SELECT * FROM orders WHERE status = 'pending' AND created_at > NOW() - INTERVAL 7 DAY;

Constraints

MUST DO

• Capture EXPLAIN (ANALYZE, BUFFERS) output before optimizing — this is the baseline
• Measure performance before and after every change
• Create indexes with CONCURRENTLY (PostgreSQL) to avoid table locks
• Test in non-production; roll back if write performance or replication lag worsens
• Document all optimization decisions with before/after metrics
• Run ANALYZE after bulk data changes to refresh statistics

MUST NOT DO

• Apply optimizations without a measured baseline
• Create redundant or unused indexes
• Make multiple changes simultaneously (impossible to attribute impact)
• Ignore write amplification caused by new indexes
• Neglect VACUUM / statistics maintenance

Output Templates

When optimizing database performance, provide:

1. Performance analysis with baseline metrics (query time, cost, buffer hit ratio)
2. Identified bottlenecks and root causes (with EXPLAIN evidence)
3. Optimization strategy with specific changes
4. Implementation SQL / config changes
5. Validation queries to measure improvement
6. Monitoring recommendations