如果无法将排序的数据整个放入排序堆中(排序堆是每次执行排序时分配的一块内存),它就会溢出到该数据库所有的临时表中。
If the sorted data cannot fit entirely into the sort heap, which is a block of memory that is allocated each time a sort is performed, it overflows into a temporary table owned by the database.
溢出是指数据被添加到分配给该缓冲区的内存块之外。
An overflow occurs when data is added to the buffer outside the block of memory allocated to the buffer.
另外,为了避免溢出,还采用块浮点结构表示数据,节省了大量的硬件资源。
Moreover, in order to avoid overflowing, it also USES block-floating-piont structure that can save many hardware resources.
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