The JusDB Database Engineering Blog

Tune PostgreSQL WAL for durability and performance. Covers synchronous_commit tradeoffs, checkpoint frequency monitoring, WAL archiving, and full_page_writes safety.

MySQL 8.4's audit log filter system lets you capture exactly the events your compliance framework requires — filtering by user, schema, event class, and severity to reduce audit log volume.

A practical guide to hardening PostgreSQL: configure SSL/TLS, tighten pg_hba.conf, implement least-privilege roles, enable row-level security, and set up audit logging.

Use ClickHouse for sub-second analytics on billions of rows. Covers MergeTree table engine, LowCardinality types, AggregatingMergeTree materialized views, and MySQL ingestion.

PostgreSQL's logging system is powerful but requires careful configuration to be useful in production. Learn how to capture slow queries, connection events, and DDL changes without drowning in noise.

Implement PostgreSQL declarative range partitioning with partition pruning, propagated indexes, instant DETACH for archival, and pg_partman for automated partition management.

Use MySQL Performance Schema to find top queries by total time, detect blocking transactions in real time, audit index usage, and analyze memory allocation.

Master pg_stat_statements for PostgreSQL query analysis. Find top queries by total time, detect plan instability via stddev, identify I/O-heavy queries, and track WAL generation.

Understand why MySQL removed the query cache in 8.0 and what to use instead: application-level Redis caching, ProxySQL query cache, and pre-computed summary tables.

Guide the PostgreSQL query planner with enable_xxx settings, pg_hint_plan extension, and extended statistics for correlated columns. Fix bad plans without rewriting queries.

Use pg_repack to reclaim PostgreSQL table bloat without the exclusive lock of VACUUM FULL. Covers installation, table vs index repack, disk space requirements, and throttling.

Tune the InnoDB buffer pool for maximum MySQL performance. Covers sizing to 70-80% RAM, monitoring hit ratio, dynamic resize, warm-up on restart, and pollution prevention.