What is your experience with databases?

My experience with databases includes:

• Administration and performance optimization: configuring parameters, managing indexes, query optimization, load monitoring, and bottleneck identification.
• Setting up replication and backups: ensuring high data availability and quick recovery after failures.
• Implementing CI/CD for databases: automating schema and data deployment using migration tools.
• Working with various database types: RDBMS (PostgreSQL, MySQL), NoSQL (MongoDB, Redis).

Specific tasks included:

• Preparing database environments for Dev, Stage, and Prod.
• Writing scripts for automatic schema creation and updates.
• Monitoring database metrics (Active Connections, Latency, Throughput) and setting up alerts.
• Troubleshooting performance issues by analyzing query explain plans.

Tools I used:

• Command-line utilities: psql, mysql, mongo.
• Migration tools: Flyway, Liquibase.
• Monitoring: Prometheus, Grafana.
• Automation: Ansible, Terraform.

-- Example query for analyzing explain plan in PostgreSQL
EXPLAIN ANALYZE SELECT * FROM users WHERE status = 'active' AND registration_date > '2023-01-01';