The JusDB Database Engineering Blog

MySQL 8.0 exposes error logs through performance_schema.error_log — enabling SQL-based filtering by severity, component, and timestamp without grep-ing log files.

Choose a current MySQL logical backup tool from measured recovery needs, and migrate legacy mysqlpump jobs and archives without risking production data.

Deploy and operate MySQL InnoDB Cluster 8.4 safely with AdminAPI, Group Replication, Router, tested failover, and recoverable outage procedures.

MySQL InnoDB tablespace encryption (TDE) encrypts data pages on disk without changing application code — using a two-tier keyring architecture that separates the master key from table keys.

Learn the fundamental principles of database schema design for building scalable applications. This guide covers entity relationships, primary keys, foreign keys, and normalization concepts essential for high-performance databases.

ProxySQL's read/write splitting routes SELECT queries to replicas and writes to the primary automatically — but getting the configuration right requires understanding hostgroups, query rules, and lag-aware routing.

Understand FoundationDB's architecture — ACID transactions, layers, and why Snowflake and Apple chose it

Master Apache Cassandra for planet-scale, always-on applications. Learn ring architecture, consistency levels, data modeling, compaction strategies, and multi-datacenter replication.

ProxySQL maintains a rich internal stats schema that most teams never fully explore. Here's how to use ProxySQL's built-in monitoring to track query latency, backend health, and connection pool utilization.

MySQL generates multiple log files that will fill your disk if left unmanaged. Here's how to configure logrotate correctly for MySQL error logs, slow query logs, and binary logs.

PgPool-II provides connection pooling, read/write splitting, and automatic failover for PostgreSQL — but its extensive configuration can be overwhelming. Here's a practical guide to getting PgPool-II running in production.

Discover how jemalloc, tcmalloc, and mimalloc can dramatically improve MySQL memory management. Real benchmarks showing 2-4x performance improvements and memory leak prevention.