Several major open source databases are approaching end-of-life in 2026: MySQL 8.0 (April 30), PostgreSQL 14 (September), Redis 7.2 (February) and 7.4 (November), and MongoDB 6.0 (June). Teams should start planning migrations at least six months in advance, beginning with a full inventory of all database instances across environments. Key steps include benchmarking current performance, setting up test environments for compatibility checks, estimating project timelines based on application criticality, budgeting for contingencies, and establishing clear communication plans with all stakeholders. Complex deployments like sharded or clustered databases require extra lead time, potentially up to twelve months for mission-critical systems.
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