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each table it scans. If you do many sequential scans, you may want to
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.. option:: --read-rnd-buffer-size arg (=262144)
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When reading rows in sorted order after a sort, the rows are read through
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this buffer to avoid a disk seeks. If not set, then it's set to the value of
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.. option:: --scheduler arg (=multi-thread)
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Select scheduler to be used.