To protect the UAP from unnecessarily being placed in wait status while accessing a table subject to data loading, you should use the pdhold command to shut down the RDAREAs that contain the table (and the RDAREAs containing indexes if the indexes are also defined for the table).
Parallel execution of data loading into the RDAREAs of a row-partitioned table reduces the length of time the table is locked (time required for data loading is reduced). If an input data file is not available for each RDAREA (only input data files for the table are available), specify the src_work statement. This statement creates an input data file for each RDAREA so that it is possible to perform parallel execution of data loading into the RDAREAs for the row-partitioned table. The files created by this statement are called divided-input data files. For details about the specifiable options and control statements, see 5.12(3) Whether options and control statements can be specified when pdload functions are used.