PostgreSQL test

The PostgreSQL test is designed to evaluate a candidate’s proficiency with PostgreSQL, an advanced open-source relational database management system. It assesses fundamental database tasks such as database design, SQL querying, and data management using PostgreSQL’s robust features. Key areas covered include PostgreSQL's syntax, built-in functions, and its implementation of the relational model.

A significant portion of the test focuses on SQL querying, testing candidates’ ability to write complex queries involving multiple tables, subqueries, joins, and aggregations. Proficiency with PostgreSQL’s unique capabilities, such as JSON and XML support, and advanced indexing techniques like B-tree, hash indexes, and GiST indexing for performance optimization, is also evaluated.

Candidates must demonstrate understanding of PostgreSQL’s transactional features, including ACID compliance, handling concurrent transactions, and ensuring data integrity. Data modeling skills, particularly in normalization and denormalization, are tested. Additionally, candidates will need to showcase expertise in database administration tasks, such as creating tables, defining constraints, writing triggers and functions, and managing user privileges.

The test also includes real-world scenarios where candidates are required to optimize queries, design efficient schemas, and implement PostgreSQL-specific extensions. Troubleshooting skills will be assessed through common PostgreSQL issues such as performance bottlenecks, deadlocks, and data corruption. A strong focus will be placed on the candidate’s knowledge of backup and recovery mechanisms, replication strategies, and security measures to maintain a stable and secure PostgreSQL environment.