DSXchange

When i trying to open a job in DS designer it is showing that , job is alrady accessed by another user, though it is not accessed by any one,

Can you tell me what is the step to kill a process , so that i can open the job

this has been discussed many many times. try searching 'job locked'

NEVER kill a DataStage process. All you have to do in this case is to release the lock.