The JusDB Database Engineering Blog

SQL Server 2016 lost support on 14 July 2026. Weigh ESUs, pick SQL Server 2022 or 2025, check the upgrade path, and run a side-by-side cutover with a safe compatibility level plan.

Plan a Valkey 8.x to 9.1 upgrade: the 9.0 and 9.1 changes to test, database-level ACLs, the CVEs fixed since 9.1.1, a rolling cluster runbook, and rollback limits.

Learn how MySQL 26.7 and 26.10 calendar versions work, how LTS and Innovation tracks differ, which upgrade paths are allowed, and which MySQL version to run in 2026.

Plan a MySQL 8.4 to 9.7 LTS upgrade: the supported path, the 9.0 to 9.6 removals to fix first, the upgrade checker run, a replica-first cutover, and rollback limits.

Fix MySQL 8.4 authentication errors: why mysql_native_password is not loaded, what caching_sha2_password needs, which drivers work, and how to migrate before 9.x.

Plan a MongoDB 8.0 to 9.0 upgrade: the behavior changes to test, driver minimums, the rolling order for replica sets and sharded clusters, and how far FCV lets you roll back.

PostgreSQL 14 reaches community end of life on November 12, 2026. Build an upgrade plan with compatibility checks, a rehearsed cutover, and clear rollback limits.