At the end of migration, OraDump to MySQL converter creates cache file (.odc) in the same folder where dump file is located, this cache file contains positions/offsets of all database objects found in the dump file. In next run of OraDump to MySQL converter over the same dump file, the tool will load necessary information about positions of all database objects from cache file that allows to omit the initial file reading.
The tool looks for cache (.odc) file in the same folder where the source dump file is located and then in the user's home folder. In any of these two cases the tool attempts to load service information about the dump file from .odc file.
The method is applied to writing service information into cache (.odc) file after migration is completed. First, OraDump to MySQL converter attempts to write it into the same folder where the source dump file is located. If it fails for some reason (for example, lack of permissions), it will create/write .odc file in the user's home folder.