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datapump inctype explanation in oracle

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$ exp file=scott.dmp log=scott.log inctype=complete
==> exporting full database (after some incremental/cumulative backups).

$ exp file=scott.dmp log=scott.log inctype=cumulative
==> exporting cumulatively (taking backup from last complete or cumulative backup).

$ exp file=scott.dmp log=scott.log inctype=incremental
==> exporting incrementally (taking backup from last complete or cumulative or incremental backup).

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