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This reference architecture guide describes the architecture design and the process and outcome of upgrading an Oracle Database 12cR2 to an Oracle Database 18cR1. The guide describes how we tested and validated the architecture with multiple datasets and workloads, with and without database snapshots, to ensure maximum flexibility and to prove that upgrading the database has no negative impact on data integrity or performance. This guide describes how to upgrade the database and discusses the methodology and results of the testing that we conducted on the architecture.