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The difference between history records and account records is detailed in the chapter "Performance Considerations." In this section, account record refers to either account or history records.
The difference between EXTDATA and account records is really the difference between a physical and a logical record. SMF data is read by the JSIMAIN program, and, in the case of EXTDATA, is simply reformatted for later use by generalized report programs, or for direct input to the JARS/OLF component. In the case of account records, the SMF data is logically combined into job or step records. These account records contain a synthesis of information from many different SMF records. The EXTDATA record (with certain exceptions) contains information from a single SMF record. Therefore, the content of a complete file of account records approximates that of a complete file of EXTDATA records; however, the number and composition of the individual records are very different.
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