DB2 reserves a slot in the buffer pool for the page.
DB 2在用于该页的缓冲池中预留一个位置。
Each thread can read and write only to its own slot, rather than to the complete buffer.
每个线程只能够读写它自己的槽位，而不是整个缓冲区。
The decision to free up a buffer pool slot is based on the least recently used (LRU) principle.
是否释放一个缓冲池槽，这是根据最近被使用(LRU)原则来决定的。
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