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Status Future consideration
Workspace Db2
Created by Guest
Created on Dec 2, 2024

RELATED IDEAS

Rollforward should proactively determine if END OF LOGS will not be able to be reached

  • In a partitioned database environment, if there is some log file from a database partition that is missing, the database can only be recovered to a point in time where the log files from all database partitions are available. If only the log files from the log archive are available, then you cannot use END OF LOGS as the stop time for a rollforward operation. This is because unarchived log files from the active log path are not available, and the rollforward utility processes only available log files. Using END OF LOGS in this situation can result in some database partitions having data that is inconsistent with other database partitions, and resulting in error SQL4973N.

  • Rollforward utility should be smarter, it would be better if it automatically detected and figured out where the end is that is reachable proactively and disallow END OF LOGS option if it cannot reach that end.


Needed By Quarter
  • Guest
    Jan 15, 2025

    It is a current product limitation, that ROLLFORWARD utility relies on user to determine the intended recovery (either END OF LOGS or point-in-time) can be performed, ie. there are sufficient log files (on all database partitions in DPF) to reach the specified recovery target.


    It is often overlooked, so the ROLLFORWARD command was issued, and then failed because some logs from a particular database partition is missing or damaged. Once in that situation, and the log file cannot be recovered, user is forced to repeat the recovery to an earlier time. This is very expensive (requires restoring the database again, so can take a long time).


    The ask is for the ROLLFORWARD utility to detect missing or damaged log file prior to replaying the good log files. While possible, the development cost is going to be high.


    There was previously a plan to provide a tool, to help determine what is a safe recovery target point to use, prior to running ROLLFORWARD. This can be viewed as a cheaper solution to this feature request.


    We will have to prioritize this against many other feature requests. It is not clear this is going to be ranked high.

    Reply

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