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Don Burleson Blog 







dba_rsrc_io_calibrate tips

Oracle Database Tips by Donald BurlesonDecember 31, 2015

Question:  I know that the dba_rsrc_io_calibrate view is used with the dbms_resource_manager.calibrate_io view to display I/O calibration information.
Can you show an example of using dba_rsrc_io_calibrate?

Answer: The dba_rsrc_io_calibrate view will store all three of the output parameters from the calibrate_io procedure.

See these important notes on dbms_resource_manager.calibrate_io tips.

Plus the two input parameters, and a start_time and end_time for multiple calibration runs:

  • START_TIME: Start time of the most recent I/O calibration.
  • END_TIME: End time of the most recent I/O calibration.
  • MAX_IOPS: Maximum number of data block read requests that can be sustained per second.
  • MAX_MBPS: Maximum megabytes per second of maximum-sized read requests that can be sustained.
  • MAX_PMBPS:        Maximum megabytes per second of large I/O requests that can be sustained by a single process.
  • LATENCY:  Latency for data block read requests.
  • NUM_PHYSICAL_DISKS The number of physical disks spindles.

set linesize 100
column time_start format a20
column time_end   format a20
   to_char(start_time, 'dd-mon-yyy hh24:mi:ss') time_start,
   to_char(end_time, 'dd-mon-yyy hh24:mi:ss')   time_end,
   num_physical_disks AS disks

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