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z/OS maintains a record of updates that SVC table update service users made to the SVC table service. Users can invoke this service by APF‑authorized requesters through the SVCUPDTE macro. When the SVC table is updated using SVCUPDTE, the previous SVC table entry is captured in the SVC update recording table with information about the program that issued the SVCUPDTE.
The SVC update recording table consists of a single entry for each of the 256 standard SVC numbers, just as the SVC table contains one entry for each SVC. Because there is only one entry for each SVC, the recording table contains only information about the most recent change to the corresponding SVC table entry. However, an SVCUPDTE count is maintained in the recording table entry that contains the total number of times that the associated SVC was modified or replaced by successive SVC updates.
Once the significant SVC update activity is identified, a table of SVC update recording entries is constructed and displayed. Each entry in the table corresponds to information extracted from a single SVC update record.
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