The JusDB Database Engineering Blog

MongoDB's flexible schema allows fields to be null, explicitly set to null, or simply absent — and these three states behave differently in queries, aggregations, and indexes.

Understand the Redis fork landscape after licensing changes. Compare Redis and Valkey features, licensing implications, migration paths, and community support.

Migrate from Redis to Valkey — compatibility, performance benchmarks, and what changes for operators

Downgrading MongoDB requires careful planning — setting the Feature Compatibility Version before replacing binaries, handling replica set members in sequence, and verifying data integrity throughout.

MongoDB's indexing system supports single-field, compound, multikey, text, geospatial, and partial indexes. Choosing the right index type and key order determines whether your queries use microseconds or seconds.

MongoDB's mongosync utility enables continuous, real-time synchronization between two MongoDB clusters — simplifying live migrations, multi-cloud replication, and DR setups.

Hatchet transforms raw MongoDB JSON logs into actionable insights — surfacing slow operations, connection storms, and namespace hotspots that are impossible to spot in raw log files.

Use Neo4j for relationship-heavy data — Cypher query language, graph algorithms, and fraud detection use cases

Build full-text search with MongoDB Atlas Search — analyzers, scoring, autocomplete, and relevance tuning

Use Azure Cosmos DB for globally distributed workloads — consistency levels, partitioning, and API choices

Achieve microsecond latencies at scale with Aerospike. Learn hybrid memory architecture, strong consistency, cross-datacenter replication, and use cases for AdTech and fraud detection.

A practical guide to Redis use cases in production — cache-aside pattern, sliding window rate limiting, Pub/Sub vs Streams, BRPOP queues with delayed job scheduling, and session storage with persistence configuration.