DSXchange

You can manage data sets using the Data Set Management utility available from the DataStage Designer, Manager, or Director. whatever you want other than truncate regarding datasets , we can do it through Data Set Manager utility. To start the Data Set Manager from the DataStage Designer, Manager, or...

According to your requirement, for the following assumed sample data col1(key) col2(Time stamp) 100 2011:03:10 08:20:00 100 2010:08:11 08:23:00 100 2010:03:10 10:30:00 101 2011:04:13 03:00:00 101 2009:02:10 01:00:00 101 2007:03:12 08:20:00 102 2010:07:16 05:30:00 102 2008:03:10 08:20:00 your output ...

In a job sequencec, specify your each and every job with a job activity stage. As you said that there is no dependencies between your jobs, do not give any interconnection between job activity stages.
When you run the job sequence, all the jobs specified in the sequence will run simultaneously..