Data Set I/O Statistics report

This report contains statistics about I/O and buffer handler activities.

Subtopics:

Example report: Data Set I/O Statistics report
Report field descriptions

Example report: Data Set I/O Statistics report

The following figure shows an example of this report.

Figure 1. Data Set I/O Statistics report

IMS HIGH PERFORMANCE UNLOAD                                   "DATA SET I/O STATISTICS"                                  PAGE:     1
5655-E06                                                   DATE: 06/01/2021  TIME: 16.16.15                         FABH070  - V1.R2


JOBNAME=THFH0601     STEPNAME=G       .URG1HD       PGMNAME=FABHURG1     PSBNAME=PHDV030H  

DDNAME   SIZE OF     NUM OF         IO         IO        RBA     PCT     PCT
           A BUF    BUFFERS     DIRECT       SEQU   REQUESTS  IO/REQ  IO/BLK
-------- ------- ---------- ---------- ---------- ---------- ------- -------
PHDV03AA     512        143          0          8        106    7.54    5.44
   OVFLW     512        143          0          1          9   11.11     .68
PHDV03AB   4,096         66          0          1          5   20.00    8.33
PHDV03AC   2,048         66          0          2         10   20.00    9.52
PHDV03BA     512        143          0          8        102    7.84    5.44
   OVFLW     512        143          0          1          7   14.28     .68
PHDV03BB   4,096         66          0          1          4   25.00    8.33
PHDV03BC   2,048         66          0          2          9   22.22    9.52
PHDV03CA     512        143          0          8        107    7.47    5.44
   OVFLW     512        143          0          1          9   11.11     .68
PHDV03CB   4,096         66          0          1          4   25.00    8.33
PHDV03CC   2,048         66          0          2          9   22.22    9.52
PHDV03DA     512        143          0          8        103    7.76    5.44
   OVFLW     512        143          0          1          7   14.28     .68
PHDV03DB   4,096         66          0          1          3   33.33    8.33
PHDV03DC   2,048         66          0          2          9   22.22    9.52
PHDV03EA     512        143          0          8        111    7.20    5.44
   OVFLW     512        143          0          2         18   11.11    1.36
PHDV03EB   4,096         66          0          1         12    8.33    8.33
PHDV03EC   2,048         66          0          3         25   12.00   14.28
-------- ------- ---------- ---------- ---------- ---------- ------- -------
TOTAL                                0         62        669    9.26  

TOTAL NUMBER OF BYTES IN BUFFER POOL:        551,936

Report field descriptions

JOBNAME: Name of the job.
STEPNAME: Name of the step for which Data Set I/O Statistics are logged. If you use a cataloged procedure (that is, FABHDBB, FABHDLI, or FABHULU), this STEPNAME is shown as G. xxxxxxxx (where xxxxxxxx is the name specified for your EXEC statement). In this example report, the cataloged procedure is used, and the name of the EXEC statement is URG1HD.
PGMNAME: Name of application program.
PSBNAME: Name of PSB containing the PCBs that are used.

For each PCB data set combination, the following information is printed:

DDNAME: ddname as coded on the DD1=keyword in the DBD that is referred to by the HSSR PCB.
SIZE OF A BUF: Buffer size.
NUM OF BUFFERS: Total number of buffers.
IO DIRECT: Number of issued direct I/O requests.
IO SEQU: Number of chained sequential I/O requests.
RBA REQUESTS: Number of buffer handler requests.
PCT IO/REQ: Percentage of issued I/O operations per buffer handler request.
PCT IO/BLK: Percentage of issued I/O operations per number of blocks or CIs contained in the data set.

The TOTAL line appears once on the report:

TOTAL: This line contains totals of the above fields.
TOTAL NUMBER OF BYTES IN BUFFER POOL: The total number of bytes of the storage allocated for the buffer pool.

Note: If one or more partitions of PHDAM or PHIDAM are in the HALDB OLR cursor-active status, each count number is 0 for each data set of the partitions.