When looking at a computer's Resource Change History (right click on computer > CMDB Functions > Resource Change History), it is noticed that certain changes that were made are not being recorded, or, older changes that were previously there have been removed. For example, the computer's Status was recently changed to Retired, but no reference to this is found.
Resource History has been configured to remove certain historical changes, and/or in SQL, history tables have been emptied or reduced in record count. When these occur, the Resource Change History either will not record certain changes any longer or older changes are removed.
Ensure that Resource History is not set to disable recording changes or is limiting the retention of the changes to a short date range.
In SQL, to avoid the loss of data for Resource Change History, it is recommended to not truncate or remove records from historical tables. However, in some cases this is required due to their extreme size to resolve performance issues. For more information abut this, refer to the following article (which is internal, please contact Symantec Technical Support to obtain a copy of this):
Can history tables be emptied to improve server performance or timeouts?
Note: Once historical data has been deleted, regardless of the cause, it cannot be recovered short of restoring the database to a point where this data used to exist at.
What reports offer a historical view of asset changes or deletions?
Random assets suddenly disappear from the Symantec Management Platform Console
Computer's Manufacturer, Model, Serial Number or System Number are incorrect or missing
Symantec Management Platform 7.x
CMDB Solution 7.x.
Asset Management Solution 7.x