The key buffer stores index blocks for MyISAM tables.
关键字缓冲区保存了myisam表的索引块。
Similar entries will group together in the index, so the index blocks will split as necessary and new entries will end up all hitting the same block until it too fills up and splits.
相似的项将在索引中同一组中，所以索引块将按需分割，且新的项将填入同一个块，直至该块已满并分割。
The search index sat on a small number of disk drives enclosed within Lego-like blocks.
那时候搜索索引就运行在象乐高玩具一样的方块围住的磁盘驱动器里面。
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