You must consider the relationships among VOBs when backing them
up and, especially, when restoring them.
As described in Backing up related databases together, database
relationships are most complex in a UCM environment, in which dozens of VOBs
are connected by cross-VOB hyperlinks of various kinds, and where there might
also be a Rational® ClearQuest® database
that holds references to objects in one or more PVOBs. Whenever one or more
of these databases is restored from backup, skew (inconsistencies) between
databases is a likely result.
This section describes several situations in which skew is introduced when
a member of a set of related databases is restored from backup. Three of these
situations apply only to UCM environments:
- A component VOB is restored from backup.
- A Rational ClearQuest database
is restored from backup.
- A PVOB is restored from backup.
This topic also describes some more general considerations for environments
that have administrative VOB hierarchies but do not use UCM.
Note: Many of
the procedures described in this section use the cleartool checkvob –ucm command.
For more information, see the checkvob reference page.