Specifying COMMIT=y prevents rollback segments from growing inordinately large and improves the performance of large imports. Specifying COMMIT=y is advisable if the table has a uniqueness constraint. If the import is restarted, any rows that have already been imported are rejected with a recoverable error.
If a table does not have a uniqueness constraint, Import could produce duplicate rows when you reimport the data.
For tables containing LONG, LOB, BFILE, REF, ROWID, UROWID, or DATE columns, array inserts are not done. If COMMIT=y, Import commits these tables after each row
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