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Status Not under consideration
Workspace Db2
Created by Guest
Created on Oct 27, 2017

Decouple archive log purging from BACKUP utility

For databases using AUTO_DEL_REC_OBJ, at the end of the BACKUP utility there is a synchronous process which purges any history records and their associated archive logs. This can take a very long time on busy systems. It is necessary to decouple this purge process so that it is either optional (perhaps an extra option on the BACKUP command) or by making the purging asynchronous.
  • Guest
    Reply
    |
    Apr 11, 2019

    This was prompted by a situation, driven by GDPR requirements, where very larget amounts of updates / deletes were being carried out.   Because of the number of archive logs being pruned after AUTO_DEL_REC_OBJ came into play, it was found that a backup taking about 3 hours was followed by a 24 hour history file cleanup / log purging exercise.

     

    The time it takes is directly related to the number of items in the history file, rather than the size of individual log files.   However, increasing log file size by too much adds extra exposures (logs not being archived "off box" quickly enough.