Practice advanced PostgreSQL features, JSON operations, and performance tuning
Start Practicing NowMaster JSONB, full-text search, and PostgreSQL-specific features
Learn EXPLAIN plans, indexing strategies, and query optimization
Understand replication, backup strategies, and maintenance tasks
Select PostgreSQL as your interview topic and customize the difficulty level
Answer realistic PostgreSQL interview questions in a simulated environment
Receive detailed feedback on your answers, including areas to improve
Monitor your improvement and identify strengths and weaknesses
JSONB operations and indexing
Full-text search and trigrams
EXPLAIN and query planning
Advanced indexing (GiST, GIN, B-tree)
Partitioning and sharding
Replication and high availability
A: JSONB stores JSON in binary format (faster than JSON type). Supports indexing with GIN indexes. Operators: ->, ->>, @>, etc. Use for semi-structured data, flexible schemas, document-like storage while keeping relational benefits. Better than separate document DB when you need both structured and flexible data.
A: MVCC allows concurrent reads/writes without locking. Each transaction sees snapshot of data. Readers don't block writers, writers don't block readers. Old row versions kept until no longer needed. VACUUM reclaims space. Trade-off: space overhead for old versions. Enables high concurrency.
A: EXPLAIN shows query execution plan. ANALYZE actually runs query and shows real timings. Read from inside out and bottom up. Look for: Sequential Scans (may need indexes), high cost values, estimate vs actual row differences. Key metrics: execution time, rows processed, buffer hits.
A: B-tree: default, most cases, equality and range queries. Hash: only equality, rarely used. GiST: geometric data, full-text. GIN: inverted indexes, JSONB, arrays, full-text. BRIN: very large tables, naturally sorted. Partial indexes: subset of rows. Expression indexes: index on function results.
Master window functions and CTEs for complex analytical queries
Understand connection pooling with PgBouncer for production apps
Know how to use pg_stat_statements for query performance monitoring
Practice with PostgreSQL-specific features: arrays, ranges, custom types
Understand replication: streaming replication, logical replication, hot standby
Join thousands of developers who have improved their interview skills with Vibe Interviews
Start Your PostgreSQL Interview Practice