I am looking for detailed explanation of "exception count" that we usually find in the system message SYSMSG of any job. I believe it has something to do with the I/O activities & requests on tables/datasets and this is impacted by the buffers & the address space available at the execution time of the jobstep. But I am not able to get a holistic view which can make my picture clear.
I am trying to address the execution-time reduction aspect of various systems, and this info would fill me up a lot in terms of analysing performance.
Joined: 26 Nov 2002 Posts: 12378 Topics: 75 Location: San Jose
Posted: Thu Jul 10, 2003 4:32 pm Post subject:
apoorvakhatri,
SMF record types 4, 14, 15, 30, 32, 34, 40, and 64 have fields that contain a count related to I/O activity. EXCP is the name of a macro that initiates I/O. These fields are called execute channel program (EXCP) counts. (1) There are two levels of EXCP counts, the DD level and the address space level. The type 30 record provides the address space level counts in the I/O Activity section and the DDLEVEL counts in the EXCP section. All other records provide only the DDLEVEL.
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