This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
The ImportRowsPerBatch property specifies the number of rows contained in a bulk-copy transaction.
The Microsoft SQL Server bulk-copy process can copy large amounts of data from an external data file to a SQL Server table. By default, a bulk-copy data-import operation inserts all rows in the data file in a single transaction. SQL Server does not guarantee data integrity until and unless a bulk-copy transaction is committed.
Use ImportRowsPerBatch to adjust the size of the bulk copy transaction.