WebDynpro Java Screen Feasibility

Hi,
I am trying to understand the Feasibility of this Requirements solution from SAP WebDynpro Java perspective.
Requirements-
1)     Design a SAP WebDynpro Java screen. On click of upload button read an Excel sheet which contains Part no1 & Part no2 records. In an excel sheet there is 6,000 records.
2)     Whenever a record is read from the Excel it will search the unique combination of Part no1 & Part no2 in the database (in this case SAP MDM Data Manger). The database contains 7,00,000 records which is not indexed/ sorted..
3)                   6000 times (excel sheet records) step 2 is repeated
4)     For each record the output can be zero, one or more records. The output need to be displayed/ generated in Excel sheet
5)     Concurrently this functionality is used by 5 users.
Question-
a)     Do this requirement can be achieved using SAP WebDynpro Java ? If yes, then from performance perspective how much time it take to upload the excel sheet & create a new Excel sheet functionality?
b)     If No, then why ?
I am trying to understand whether this requirement is Feasible (Y/ N) with valid reasons?
Any valid inputs will be highly appreciated!
Thanks,
Kumar

Hi Robin,
Let me advise SAP MDM administrator to index the database.
1) If it is indexed and if it works then as proximity how much time it take to read and generate an excel sheet ?
2) Suppose after indexing the database is not indexed/ it does not work (limitation from DB perspective) then proximity how much time it take to read and generate an excel sheet ?
This requirement is feasible (Y/N) from WebDynpro Java perspective ?
Also could you please clarify this sentence - "But don't do it while reading the file, the I/O will drain your performance)".
Thank you for the prompt reply.

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