Messages describing errors or inconsistencies are generated during EXAMINE processing as that condition is detected. The detection of an error condition can result in the generation of many messages. There are five distinct types of EXAMINE error messages:

1. Status and Statistical Messages. This type of message tells you the status of the EXAMINE operation, such as the beginning and completion of each test. It provides general statistical data, such as the number of data records, the percentage of free space in data control intervals (CIs), and the number of deleted CIs. The four status messages are IDC01700I, IDC01701I, IDC01709I, and IDC01724I. The five statistical messages are IDC01708I, IDC01710I, IDC01711I, IDC01712I, and IDC01722I.
2. Supportive (Informational) Messages. Supportive messages (all remaining IDC0-type messages) issued by EXAMINE clarify individual data set structural errors and provide additional information pertinent to an error.
3. Individual Data Set Structural Error Messages. The identification of an error is always reported by an individual data set structural error (IDC1-type) message that can be immediately followed by one or more supportive messages.
4. Summary Error Messages. One or more summary error (IDC2-type) messages are generated at the completion of either INDEXTEST or DATATEST to categorize all individual data set structural error (IDC1-type) messages displayed during the examination. The summary error message represents the final analysis of the errors found, and the user should follow the course of recovery action as prescribed by the documentation.
5. Function-Not-Performed Messages. Function-not-performed messages (all of the IDC3-type messages) indicate that the function you requested cannot be successfully performed by EXAMINE. In each case, the test operation terminates before the function completes.
   Function-not-performed messages are issued for a variety of reasons, some of that follows:

   • A nonvalid request (such as an attempt to examine an entry-sequenced data set (ESDS))
   • A physical I/O error in a data set
   • A system condition (such as insufficient storage)
   • A system error (such as an OBTAIN DSCB failed)
   • An error found during INDEXTEST (see Skipping DATATEST on Major INDEXTEST Errors).