Explanation/Reference:
Explanation:
Data Access Mode - This setting provides the 'fast load' option which internally uses a BULK INSERT

statement for uploading data into the destination table instead of a simple INSERT statement (for each single row) as in the case for other options.
BULK INSERT parameters include:

- ROWS_PER_BATCH =rows_per_batchIndicates the approximate number of rows of data in the data file. By default, all the data in the data file is sent to the server as a single transaction, and the number of rows in the batch is unknown to the query optimizer. If you specify ROWS_PER_BATCH (with a value > 0) the server uses this value to optimize the bulk-import operation. The value specified for ROWS_PER_BATCH should approximately the same as the actual number of rows.