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REPLACE drops the existing table and then creates and loads it from the source. This is not a valid option if the CONTENT parameter is set to DATA_ONLY.
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When you use TRUNCATE or REPLACE, ensure that rows in the affected tables are not targets of any referential constraints.
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If the schemas have a lot of grants, the import might not get them all depending on who granted them.
If you drop a user, all grants are removed. Depending on the export, you might need to re-grant them. Again, depends on the export.
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