數據庫內核雜談(十三)：如何把一個單機數據庫擴展成分佈式數據庫

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"本篇文章選自"},{"type":"link","attrs":{"href":"https:\/\/www.infoq.cn\/theme\/46","title":"","type":null},"content":[{"type":"text","text":"數據庫內核雜談"}]},{"type":"text","marks":[{"type":"strong"}],"text":"系列文章。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"歡迎閱讀新一期的數據庫內核雜談。首先和大家道個歉，拖更太久了。下半年工作太忙了，一直沒能空出時間來更新。終於到了感恩節假期，趕緊來填一下"},{"type":"link","attrs":{"href":"https:\/\/www.infoq.cn\/article\/gaOh3me9PmJBiQFD2j15","title":"","type":null},"content":[{"type":"text","text":"上一期"}]},{"type":"text","text":"留下的坑：假設給一個單機的數據庫系統實現，在這個基礎上如何把它擴建成分佈式數據庫系統。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"先來說說這個坑的趣事，當時在原公司參與系統設計面試，但不幸和同事撞題了。。。這個題是我在推開面試會議室門的時候臨時想的(被自己機智到了！)記得，當時是這麼對面試者說的，“你好，今天我們要做的設計題是，假定現在給你一個單體的數據庫系統實現，比如開源的Postgres或者MySql的實現，把它拓展成一個分佈式數據庫。要求是，一，分佈式設置對客戶端屏蔽，即，對客戶端來說，還是連接到了一個邏輯的數據庫實體；二，實現基本的SQL實現。”。後來我仔細想想，覺得這個設計題還是蠻不錯的。足夠開放，可以橫向聊全局，也可以縱向聊細節。看到這裏，大家可以暫停一下，思考一下，你會怎麼做？"}]},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"全局分配"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}