[单选]
Your database is functional with peak load for one hour. You want to preserve the performance statistics collected during this period so that they can be used for comparison while analyzing the performance of the database in the future.
What action would you take to achieve this task？（）

A . Set the STATISTICS_LEVEL initialization parameter to ALL.
B . Create a baseline on a pair of snapshots that have the statistics of the peakload period in the database.
C . Decrease the snapshot interval in the AWR to collect more number of snapshots during the peakload period.
D . Set the snapshot retention period in the Automatic Workload Repository （AWR） to zero to avoid theautomatic purging of the snapshots.

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Your database is functional with peak load for one hour. You want to preserve the performance statistics collected during this period so that they can be used for comparison while analyzing the performance of the database in the future.
What action would you take to achieve this task？（）

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