ora_logicalIO_histogram_example.txt

ora_logicalIO_histogram.py measures the latency between call and return for the Oracle function kcbgtcr, 
which is an important part of the logical IO processing for consistent reads, 
and reports the values as a series latency histogram

Example:

# ./ora_logicalIO_histogram.py -p 123 3 10
Latency histograms for kcbgtcr, Oracle logical IO for consistent read... Hit Ctrl-C to end.

     kcbgtcr latency, ns : count     distribution
         0 -> 1          : 0        |                                        |
         2 -> 3          : 0        |                                        |
         4 -> 7          : 0        |                                        |
         8 -> 15         : 0        |                                        |
        16 -> 31         : 0        |                                        |
        32 -> 63         : 0        |                                        |
        64 -> 127        : 0        |                                        |
       128 -> 255        : 0        |                                        |
       256 -> 511        : 0        |                                        |
       512 -> 1023       : 0        |                                        |
      1024 -> 2047       : 0        |                                        |
      2048 -> 4095       : 0        |                                        |
      4096 -> 8191       : 1040     |****************************************|
      8192 -> 16383      : 143      |*****                                   |
     16384 -> 32767      : 20       |                                        |
     32768 -> 65535      : 12       |                                        |
     65536 -> 131071     : 4        |                                        |