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After determining the EXTDATA records that need to be generated to satisfy your reporting requirements, and creating them through options on the EXTDATA control statement, a decision must be made about the method used to store archival data. A working Account file is created during each execution. This file is a concise and manageable collection of computer utilization statistics at the job and step levels, and can be defined as a temporary sequential file. This file may or may not contain EXTDATA, depending on options selected on the EXTDATA control statement during execution. The user can elect to keep this file for further processing by defining a permanent DDNAME CAIJSACT in the JCL. This product can also produce History files, if requested, which are usually on tape and used for archival purposes. The decision to use permanent Account files or History files as your means of storing archival data will depend on the type of processing you are doing. If the EXTDATA only option of the EXTDATA control statement is set to "Y" (meaning EXTDATA records will be the only output of the execution), then the most efficient method of storing data is to retain the account file permanently. If the EXTDATA only option is set to "N", then the use of History files as the method of data archival should be used. For mixed use files, files that will contain both Account/History records and EXTDATA records, level 7 History files (the most detail level available) should be used to maintain archival data.
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