The JusDB Database Engineering Blog

PostgreSQL disaster recovery requires more than just running pg_dump — it needs WAL archiving, PITR capability, regular restore testing, and clear RTO/RPO targets. Here's how to build it.

Deploy a production PostgreSQL HA cluster with Patroni and etcd. Covers configuration, patronictl commands, HAProxy integration, and failover procedures.

MongoDB indexes fragment over time as documents are inserted, updated, and deleted. Here's how to detect fragmentation, measure its performance impact, and rebuild indexes safely.

Understand InnoDB crash recovery mechanics and handle edge cases with innodb_force_recovery. Emergency dump procedures and durability settings to prevent future crashes.

Day-to-day MongoDB replica set operations: adding/removing members, triggering elections, diagnosing replication lag, and managing oplog size.

An honest comparison of MongoDB and PostgreSQL in 2026 — document model vs relational model, JSONB as a document store, ACID transaction trade-offs, horizontal scaling, licensing, and migration paths.

Set up PostgreSQL streaming replication from scratch. Covers primary configuration, standby base backup, replication monitoring, and manual failover promotion.

Systematically diagnose and fix MySQL 'Too many connections' errors. Learn to identify connection leaks, tune wait_timeout, and implement ProxySQL pooling.

Configure ProxySQL for transparent read/write splitting, connection pooling, and replication lag monitoring. Covers query rules, hostgroups, and stats analysis.

Configure MySQL Orchestrator for automated failover and replication topology management. Step-by-step guide covering installation, Raft mode, and failover testing.

Redis 8 and Valkey 8 both launched in 2025 with competing performance claims. They differ on licensing, governance, and roadmap. Here is how to choose for production.

PostgreSQL 17 is one of the most impactful releases in years. Incremental backups, vacuum improvements, logical replication failover slots, and planner enhancements are all production-critical changes.