For more information about the impact of reorg commands, see the DB2 Command Reference.
If you are making several changes, it is also recommended that you rebind your packages to improve performance. DB2 Change Management Expert generates rebind commands for all the packages in the database for the selected schemas by default. To limit the scope to only those packages with the DDL in the change command files, you can check the Limit the scope of the generated rebind commands to the selected change command files option.
These commands should be run after the changes have been made to your database and after the data has been loaded into various tables.