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I want to detect if there is any duplicates in the source file. If it's there then the job will not loading data into the table and will write the duplicates in a flat file and mail the file to the particular .

Advice me in both parallel and server job..

Can anyone pls help with the answer...it's urgent ???

Please be clear with the requirements. Whether the the job should write whether only duplicates or all records if encountered with duplicates.
In PX , the Job can be designed like, the one below,
1.if you want to filter out only duplicate records.
seq_file_stage ---->>agg(no. of rec with a key)---->>filter ---->> targets

2. If you want all the records to a flat file
seq_file_stage ---->>agg(no. of rec with a key)---->>sort(desc)--->>filter--->>targets

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You don't need DataStage to DETECT duplicates in a file. Perform a unique sort on the file and compare the result with the original - if they are the same size then there were no duplicates.