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View the Exhibit to examine the parameters set for your database instance. You execute the following command to perform I/O calibration after the declaration of bind variables in the session that are used in the command: SQL> EXECUTE dbms_resource_manager.calibrate_io( num_physical_disks=>1, max_latency=>50, max_iops=>:max_iops, max_mbps=>:max_mbps, actual_latency=>:actual_latency); Which statement describes the consequence? Exhibit:
Correct Answer: A
Explanation/Reference: Explanation: Requisition of Calibrate I/O (link) Before running I/O calibration, ensure that the following requirements are met: The user must be granted the SYSDBA privilege timed_statistics must be set to TRUE Asynchronous I/O must be enabled When using file systems, asynchronous I/O can be enabled by setting the FILESYSTEMIO_OPTIONS initialization parameter to SETALL. Ensure that asynchronous I/O is enabled for data files by running the following query: COL NAME FORMAT A50 SELECT NAME,ASYNCH_IO FROM V$DATAFILE F,V$IOSTAT_FILE I WHERE F.FILE#=I.FILE_NO AND FILETYPE_NAME='Data File'; Additionally, only one calibration can be performed on a database instance at a time.