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You find today’s performance of your production database to be the best ever. Therefore， you want to be notified in the future whenever the performance degrades by 10% of today’s performance. What is the first step that you would take to ensure this？（）
A:create baseline metrics for today’s performance
B:write the current database metrics to a database table and create a trigger to compare with future database statistics
C:write the current database metrics to a flat file and create an operating script to compare with future database statistics
D:write the current database metrics to a database table and create a procedure to compare with future database statistics
E:write the current database metrics to a database table and submit a job using DBMS_JOB to compare with future database statistics

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出自：Oracle认证

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