It is a file-watch event. It waits for a specific file to arrive at a specific location.
For the purpose of creating indexes after the load process, command tasks at session level can be used. Index creating scripts can be brought in line with the session’s workflow or the post session implementation sequence. Moreover this type of index creation cannot be controlled after the load process at transformation level.
Can one use mapping parameter or variables created in one mapping into any other reusable transformation?
Yes, One can do because reusable transformation does not contain any mapplet or mapping.