Rolling Back to the Old Source File

After creating a new source file by merging an old source file with a maintenance file, you may want to return to using the old source after it is no longer available. To rollback to the old source, use a collision file, as shown in Title not available.

Collision files are created at your option when GENCAT merges source and maintenance files. A collision file contains the changes that were made to an old source. A collision file's contents depends on the source and maintenance files and the method used of merging. Unlike a maintenance file which contains information to change the old source into the new source, a collision file contains information to re-create the old source from the new source. To rollback to the previous version of the source, the collision file is merged against the new source with the same merging method that was used to create it.

Figure 4-4 Rolling Back to the Old Source Catalog