A table of checked out objects is kept in the Host Encyclopedia. Even if no subsets are defined, objects are added to this table for subset ALL. When the override function is requested, the encyclopedia updates, in the case of subset ALL, or deletes, in the case of a subset, the rows in this table for the model or subset.
Most functions are allowed to run at the same time as an override of a checkout status, but because of the amount of updating that is done, this can cause DB2 contention.
Periodic commits are taken during the delete or update. If a failure occurs during override, the next download of the model or a subset of it cleans up the partial checkout.
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