Database PostgreSQL MySQL Performance SQL Tuning Advanced High demand

MySQL and PostgreSQL Database Performance Engineering

Advanced query optimization, indexing strategies, and database reliability.

About This Assessment

Database reliability engineers earn $130K-$230K and a single poorly optimized query can bring down entire production systems. This assessment validates expertise in query plan analysis, index design, replication topology, vacuum tuning, and performance troubleshooting for MySQL and PostgreSQL at scale. Companies pay premium rates because database mistakes have catastrophic business impact.

What Candidates Will Do

Analyze slow query logs and EXPLAIN plans to identify performance bottlenecks

Design optimal indexes for complex queries while avoiding index bloat

Configure and troubleshoot PostgreSQL replication (streaming, logical) and failover

Optimize PostgreSQL VACUUM and autovacuum settings to prevent bloat and transaction ID wraparound

Tune database parameters (shared_buffers, work_mem, checkpoint settings) for workload characteristics

Automated Grading

Verify correct EXPLAIN plan interpretation, appropriate index creation that improves query performance by >10x, successful replication setup with failover testing, proper vacuum scheduling preventing bloat accumulation, and configuration changes that demonstrably improve throughput and reduce I/O wait.

Environment

Ubuntu VM with PostgreSQL 15+, MySQL 8.0+, pgBadger log analyzer, pg_stat_statements extension, mytop/innotop monitoring tools, sample databases with realistic workload data.

Earn a Verified Certificate

Pass this assessment and receive an AbilityScreen Certified Professional credential — verifiable proof of your hands-on skills that you can share with employers.

Performance-verified — proves real skills demonstrated in a live environment, not a multiple-choice test
Employer-verifiable — each certificate has a unique ID that anyone can verify online
Career-ready — share directly to LinkedIn or include in your resume

Ready to prove your skills?

Purchase this assessment and get started today.

$179.00