How is database performance evaluated?

Database performance is evaluated based on several key metrics and methods:

• Response Time (Latency): how long it takes to execute a query.
• Throughput: the number of queries processed per unit of time.
• Resource Load: utilization of CPU, memory, disk, and network.
• Locking and Contention Metrics: how often locks or waits occur.

Typically, load testing is conducted using specialized tools (e.g., JMeter, sysbench, pgbench), and logs and monitoring metrics are analyzed. It is also important to profile queries using EXPLAIN plans and indexes to identify bottlenecks.

Example: if a database responds too slowly to a specific query, you can analyze its execution plan and optimize indexes or rewrite the query.