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.
Ready to prove your skills?
Purchase this assessment and get started today.
$179.00