For large migrations, you can plan ahead to migrate the
data in small increments. Use the --prevDirs and --prevDirsFile options
of the export command.
About this task
When you export a large amount of data, you can identify
subdirectories under the export root and then export and import them
separately. At the end, you export and import the root, and then you
can specify the --prevDirs option to exclude previously
exported files from your current export. The syntax of the --prevDirs and --prevDirsFile options
is:> ccc export ccase -d <intermediate data directory>
-i <View-relative root path to export>
--prevDirs <space-separated previously exported data path>
--prevDirsFile <path to a text file that contains previously exported data path>
...
Procedure
- Export the subdirectories. For example, if the directory
is M:\aView\aVOB\aRoot, you can identify the
subdirectories to export to:
> ccc export ccase -d C:\data\sub1 -i M:\aView\aVOB\aRoot\sub1
> ccc export ccase -d C:\data\sub2 -i M:\aView\aVOB\aRoot\sub2
> ccc export ccase -d C:\data\sub3 -i M:\aView\aVOB\aRoot\sub3
- Then, export the root using the
--prevDirs option:
> ccc export ccase -d C:\data\aRoot -i M:\aView\aVOB\aRoot
--prevDirs C:\data\sub1 C:\data\sub2 C:\data\sub3
Results
The export and import of the root is divided to four operations,
and all commands finish in a reasonable amount of time. You can also
use the --prevDirs or --prevDirsFile options
when you have additional check-in versions to migrate at the same
root, or when you have additional Rational®
ClearCase® views
to migrate.
What to do next
When you run the import commands, they run in the same order
as you exported them.