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Asked: 2026-05-31T07:10:28+00:00

Do i need to ensure that each batch is completely full? ie if i

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Do i need to ensure that each batch is completely full? ie if i had a datatable with 12028 rows, could i just use a batch size of 10k and it would automatically create 2 batches, 1 with 10k in and 1 with 2028 in?

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  1. Editorial Team

    According to MSDN: SqlBulkCopy.BatchSize —

    If the SqlBulkCopy instance has been declared without the
    UseInternalTransaction option in effect, rows are sent to the server
    BatchSize rows at a time, but no transaction-related action is taken.
    If UseInternalTransaction is in effect, each batch of rows is inserted
    as a separate transaction.

    The BatchSize property can be set at any time. If a bulk copy is
    already in progress, the current batch is sized according to the
    previous batch size. Subsequent batches use the new size. If the
    BatchSize is initially zero and changed while a WriteToServer
    operation is already in progress, that operation loads the data as a
    single batch. Any subsequent WriteToServer operations on the same
    SqlBulkCopy instance use the new BatchSize.

    Based on this information, I am inclined to believe that setting batch size to 10k rows and you provide 12k+, multiple batches will be created.

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