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Status Under review
Workspace Db2 for z/OS
Created by Guest
Created on Aug 14, 2024

RELATED IDEAS

RESTORE SYSTEM should support log apply across DSN1COPY and vendor utilities

RESTORE SYSTEM can fail in log apply when there was a DSN1COPY or vendor utility within the log apply range. This occurs because RESTORE SYSTEM uses pageset control log records to determine that a LOG NO utility had been run, and neither DSN1COPY nor vendor utilities write this log record.

RESTORE SYSTEM should detect when DSN1COPY (or any other offline / vendor utility) was run during the log apply range so that log apply errors can be avoided.


Vendor utilities create a sequential copy which is posted to the SYSIBM.SYSCOPY table as a LOG(NO) copy. RESTORE SYSTEM with LOG APPLY may encounter problems related to these copy files. The RESTORE SYSTEM processing relies on Db2 log records to identify system activity fitting the desired restore time frame. Third party processing can cause data location changes which can impact the RESTORE SYSTEM processing in unpredictable ways.

The creation of the LOG(NO) copy files is not made available to the Db2 log. The RESTORE SYSTEM processing cannot rely on header page fields in an object to detect LOGNO activity. The processing involves a wider scope of utility processing and system activity, requiring a more robust and reliable solution. Vendor utilities need to write non-recoverable LOGNO PAGE SET CONTROL log records to the Db2 log.

Doing so will enable RESTORE SYSTEM processing to distinctly detect the LOGNO utility files, allowing these objects to be put in RECP. Putting the object in RECP will avoid the problems seen by customers when using RESTORE SYSTEM for cloned environments.

Vendor utilities need a way to write the LOGNO PAGE SET CONTROL LOG records to the Db2 log. An interface to write the desired record to the Db2 log is needed. The interface will need to supply a response for each write request, indicating its success or failure. We will need a complete breakdown of the format and content of the log record that needs to be written. We will need to be aware of any system settings or variables that may impact what is represented or reflected in the log record being written.

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