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The following command is executed to create the baseline template：   SQL> EXECUTEDBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE_TEMPLATE（START_TIME=> TO_TIESTAMP（SYSDATE+2），  END_TIME=>TO_TIMESTAMP（SYSDATE+10）， BASELINE_NAME=>’Mybase4’，  TEMPLATE_NAME=>’Mytemp4’， EXPIRATION=>NULL）；   Which statement is true about the effect of the above command？（）  
A: It creates a baseline template that never expires.
B: It produces an error because no snapshot information is provided to create the baseline.
C: It creates a baseline template that expires after the Automatic Workload Repository （AWR） retention period.
D: It creates a repeating baseline template that repeats after the Automatic Workload Repository （AWR） retention period.

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出自：Oracle认证

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