The JusDB Database Engineering Blog

MongoDB's Slot-Based Execution (SBE) engine introduced a plan cache memory leak affecting certain MongoDB versions — here's how to detect, mitigate, and fix it.

Configure pgBouncer correctly for your PostgreSQL workload. Compare transaction vs session pooling, size your pool correctly, and monitor pool health in production.

Master PostgreSQL EXPLAIN ANALYZE output: understand node types, cost estimates, actual vs estimated rows, and identify the root cause of slow queries.

AWS DMS can migrate terabytes of data with zero downtime — but default settings leave significant performance on the table. Here's how to tune DMS for production-grade migrations.

Decode MySQL deadlock messages from SHOW ENGINE INNODB STATUS, understand lock ordering, and write application code that eliminates deadlocks permanently.

In 2026, more database versions are hitting end-of-life than any year in recent history.

Master InnoDB buffer pool internals: page management, chunk allocation, LRU algorithm, and tuning strategies for maximum cache efficiency.

Benchmark MySQL with sysbench OLTP workloads. Covers setup, read/write and read-only suites, interpreting TPS and 95th percentile latency, and comparing before/after changes.

Use pgbench to benchmark PostgreSQL before and after configuration changes. Covers scale factor selection, TPC-B and read-only workloads, custom SQL scripts, and latency percentiles.

MySQL Group Replication and Galera Cluster both promise multi-primary high availability, but they behave very differently under load, network partitions, and node failures.

Connection exhaustion is one of the most common causes of database downtime at scale. Here is how production teams use PgBouncer and ProxySQL to handle 10,000+ concurrent connections.

Explore PostgreSQL 18 revolutionary features including async I/O, improved parallelism, enhanced JSON support, and developer experience improvements coming in 2025.