IDC11724I DATA COMPONENT CA NOT KNOWN TO SEQUENCE SET
Explanation
Some abnormal situations, such as ABENDs or logical errors, can cause a control area (CA) split or CA reclaim to be interrupted. A logical error results in VSAM backing out the CA split that is in progress and returning a nonzero return code to the PUT that caused the CA split. When a CA split is aborted in an abnormal condition, an unreachable new CA (commonly referred to as an orphan CA) can be left behind within the data set. This in itself does not cause a data integrity problem and the data set is fully functional and accessible.
Orphan CAs might have an effect
on other programs or functions:
- The VSAM data set may fill up prematurely when there are a large number of orphan CAs and this may require the data set to be reorganized to reclaim the unusable DASD space.
- DFSMSdss will not complete a dump of the data set if the VALIDATE parameter is used and results in message ADR970E. Manual intervention is required to create a backup of the data set.
- IDCAMS EXAMINE INDEXTEST DATATEST generates the
IDC11724I message and sets the return code to 4 if only the orphan
CA condition is present and no data integrity problems are detected.
However, if the EXAMINE also detects data integrity problems, it
will also display other messages and will return with return code
= 8 (and not 4). Because EXAMINE INDEXTEST DATATEST checks both the
index and data components, its return code is more accurate in reflecting
the true severity of the situations it detects than that of EXAMINE
DATATEST NOINDEXTEST; it is also more thorough in detecting errors.
Below are some output examples:Example 1
EXAMINE NAME(xxxxxxxx) INDEXTEST DATATEST IDC01700I INDEXTEST BEGINS IDC11724I DATA COMPONENT CA NOT KNOWN TO SEQUENCE SET IDC21700I MINOR ERRORS FOUND BY INDEXTEST IDC01701I DATATEST BEGINS IDC11768I [CI SPLIT | CA RECLAIM] IN PROGRESS IDC01713I DATA CONTROL INTERVAL DISPLAY AT RBA yyy FOLLOWS ... IDC01714I ERROR LOCATED AT OFFSET zzzzzzzz IDC11724I DATA COMPONENT CA NOT KNOWN TO SEQUENCE SET IDC21703I MINOR ERRORS FOUND BY DATATEST IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 4Example 2EXAMINE NAME(xxxxxxxx) INDEXTEST DATATEST IDC01700I INDEXTEST BEGINS IDC11718I DATA COMPONENT HIGH-USED RBA IS NOT EQUAL TO CA SIZE IDC01702I HIGH-USED RBA/CI IS xx IDC01705I CONTROL AREA SIZE IS xxxx IDC11711I INDEX CONTROL INTERVAL COUNT ERROR IDC01708I 1 CONTROL INTERVALS ENCOUNTERED IDC01702I HIGH-USED RBA/CI IS xxx IDC01704I CONTROL INTERVAL SIZE IS xxxx IDC11708I HIGH-USED INDEX RBA DOES NOT EQUAL HIGHEST RBA FOUND IDC01702I HIGH-USED RBA/CI IS xxx IDC01706I RBA/CI IS xxx IDC21701I MAJOR ERRORS FOUND BY INDEXTEST IDC01701I DATATEST BEGINS IDC11768I [CI SPLIT | CA RECLAIM] IN PROGRESS IDC01713I DATA CONTROL INTERVAL DISPLAY AT RBA xxxx FOLLOWS ... IDC01714I ERROR LOCATED AT OFFSET xxxxxxxx IDC11724I DATA COMPONENT CA NOT KNOWN TO SEQUENCE SET IDC21703I MAJOR ERRORS FOUND BY DATATEST IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 8Note: In cases where the High-used RBA does not equal the highest found RBA (as indicated by IDC11708I in the example above), an IDCAMS VERIFY should be run first and the EXAMINE rerun.Similarly, IDCAMS EXAMINE INDEXTEST NODATATEST issues the IDC11724I message and sets return code to 4, or RC=8 if it detects data integrity problems. - IDCAMS EXAMINE DATATEST NOINDEXTEST always gives
a return code of 8 for message IDC11724I because it does not review
the entire index structure and cannot determine if the missing CAs
present a data integrity issue or not. EXAMINE DATATEST NOINDEXTEST
is faster than DATATEST INDEXTEST, so is better suited to more quickly
determine whether or not there are orphan CAs or some other errors
that can be found without searching the whole index structure. If
errors are found, issue EXAMINE DATATEST INDEXTEST to pinpoint the
severity of the situation and to find the complete set of errors.
Below is an output example:
EXAMINE NAME(xxxxxxxx) DATATEST NOINDEXTEST IDC01701I DATATEST BEGINS IDC11768I [CI SPLIT | CA RECLAIM] IN PROGRESS IDC01713I DATA CONTROL INTERVAL DISPLAY AT RBA yyy FOLLOWS ... IDC01714I ERROR LOCATED AT OFFSET zzzzzzzz IDC11724I DATA COMPONENT CA NOT KNOWN TO SEQUENCE SET IDC21703I MAJOR ERRORS FOUND BY DATATEST IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 8
System action
Supportive messages display pertinent data, and processing continues.
Programmer response
The dataset has ownership of physical space on the volume that it will never use. To clean up the orphaned CAs, a reorganization of the dataset will need to be done. This corrective action applies to only the RC=4 situations. When RC=8, the data set might be broken and might need to be recovered with a process beyond reorganization.
Source
DFSMSdfp