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Why would you use WebLogic Diagnostics Framework （WLDF） instead of Oracle Enterprise Manager （OEM） （）
A: WLDF has better performance than OEM 
B: my organization already has a solution for unified management and monitoring； we need to supplement that with some specific WLS-related capabilities
C: OEM is not certified with latest version of WLS
D: OEM is really focused on the database tier， is not meant to address JEE management and monitoring

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出自：Oracle认证

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