Direct loading can be used to Single transformation where as indirect transformation can be used to multiple transformations or files
In the direct we can perform recovery process but in Indirect we cant do it
when we use multiple source files, we create a file containing the names and directories of each source file we want the Power Center Server to use. This file is referred to as a file list. when configuring the session properties,choose Indirect in the Source File type field,enter the file name of the file list in the Source File name field and enter the location of the file list in the Source File Directory field. When the session starts, the Power Center Server reads the file list, then locates and reads the first file source in the list. After the Power Center Server reads the first file, it locates and reads the next file in the list.