Explain the up date strategy and what are the options for update strategy?

Update strategy is used for flagging records by using the options insert/update/delete/reject.
Update strategy is used in two levels.
1. Session level. At session level we have to use the options update as insert, update as update, update else insert.
2. Mapping level. At mapping level we have to use the options dd-insert, dd-update, dd-reject, dd-delete.

Asked on May 31, 2017 in ETL.
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