When connecting to an Oracle database, the Sqoop import command requires case-sensitive
table names and usernames (typically uppercase). Otherwise the import fails with error message "Attempted to
generate class with no columns!"
Prior to the resolution of SQOOP-741, import-all-tables would fail for an Oracle database. See the JIRA for more information.
The import-all-tables command has additional restrictions. See Chapter 8
in the Sqoop User Guide.
