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Set the output type. ndb  is the default. null  is used only for testing. 

• --output-workers = # 

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Set the number of threads processing output or relaying database operations. 

• --pagesize = # 

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Align I/O buffers to the given size. 

• --pagecnt = # 

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Set the size of I/O buffers as multiple of page size. The CSV input worker allocates buffer that is doubled in size. 

• --polltimeout = # 

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