IAMINFO Reports

IAM provides a one page run-time report on data set usage, which is produced each time an IAM data set is closed (provided that the job has an IAMINFO DD card). Optionally, IAM can produce an SMF record with the same information by the IAM Global Options table. These reports contain information on the data set attributes, various statistics about the content of the data set, statistics on the resource usage, and statistics on the different types of I/O requests processed. The IAM overrides used for each data set are also included in the report, adjacent to the statistic that would be most influenced by the override. The IAMINFO reports are the primary information source for what is going on with each data set. Many of the questions about resource usage or performance on any particular IAM data set can be answered with the IAMINFO reports.

The IAMINFO reports are easily obtained by providing an IAMINFO DD card in each job step that processes an IAM data set. Normally, this DD statement indicates a SYSOUT file, but can indicate an actual sequential data set if desired. The only additional overhead when using IAMINFO is the overhead of actual formatting and writing out the report. IAM always maintains the various statistics that are reported on with IAMINFO, regardless of whether the DD statement is in the JCL.

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