Index
1 index是對錶的被索引列的複製
2 index可以增加查詢效率,但是會影響寫效率
3 index是資料庫進行動態維護的
4 透過雙向連結串列來構建資料的邏輯順序【區別於物理順序,物理上的葉子節點是隨機的 】,使用雙向連結串列使得資料插入時不需要移動資料,而是隻要更改指標的指向。
5 雙向連結串列連結的是葉子節點,葉子階段中存放著key
6 B【balanced】樹實則查詢更加迅速
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