The JusDB Database Engineering Blog

Monitor ETL pipelines with data freshness checks, row count reconciliation, dbt data quality tests, and Slack alerting. Detect silent failures before users do.

MariaDB and MySQL have diverged significantly. This guide compares licensing, Galera vs Group Replication, thread pool, cloud support, and migration paths.

Choose PostgreSQL backup and recovery methods from explicit RTO and RPO, preserve continuous WAL, verify manifests, and rehearse isolated restores.

MySQL 8.0 end-of-life is April 2026. Plan your upgrade to MySQL 8.4 LTS now. Learn migration strategies, new features, and compatibility considerations.

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

PostgreSQL 17 finally adds native incremental backup support — allowing subsequent backups to capture only changed blocks since the last full backup.

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

Apply GitOps principles to database changes — PR-based schema reviews, automated migrations, and rollback strategies

A production guide to zero-downtime database migrations — why ALTER TABLE causes downtime, the Expand-Contract pattern, safe migration patterns for PostgreSQL and MySQL, and tooling with Flyway, Liquibase, pt-osc, and gh-ost.

Use pg_upgrade to migrate between PostgreSQL major versions — upgrade strategies, pre-checks, and rollback plans

A production guide to AWS Database Migration Service — replication instance sizing, endpoint configuration, Full Load vs CDC vs Full Load+CDC modes, performance tuning, and DMS vs Debezium vs pglogical.