High-water mark (high water mark) HWM can be understood as a history of the highest water level of the reservoir, which is the original meaning of the HWM. In the database can be said to occupy the most space of the table data, delete does not change HWM (that is, the upper limit of the data storage table space) table to table and it will truncate
High-water mark (high water mark)
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Origin blog.csdn.net/XM_no_homework/article/details/104420378
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