The original title is quite long and contains a series name. Let me rewrite it to be punchy and under 12 words while preserving key facts.

Short summary

Cloud database migrations often succeed at cutover but fail silently afterward because standby instances, DR sites, and replication pipelines drift out of sync with the primary. Key risks include mismatched patch versions, IAM policy gaps for cross-region instances, and unverified monitoring on passive standby databases. The article recommends automated migration pipeline validation, continuous mock failover drills, and choosing the right migration toolset (OCI GoldenGate, DMS, or Data Pump) based on downtime tolerance and workload criticality.

• •Hidden post-migration downtime stems from configuration drift between primary and standby database environments
• •Critical blindspots include version mismatches, IAM disconnects, and telemetry failures on passive standby instances
• •Automated validation, continuous mock drills, and selecting the right migration toolset are essential for long-term operational stability

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