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      鄭州北大青鳥:能否用MySQL替代當前Oracle?
      作者: 添加時間:10-13 瀏覽次數:0

           今天我們河南北大青鳥中心學術部金牌講師和我們大家一起討論一些關于MySQL的面向企業級應用的思路,以及能否用 MySQL 替代當前Oracle 的問題。

         首先說明一點的是,我不是說 MySQL 沒有大企業級的應用,事實上,可以看到越來越多的成功布署 MySQL 的應用,但是,還不夠多,還有許多大企業的關鍵應用還不敢用 MySQL。  

             存儲引擎
        由于 MySQL 自己一直沒有一個成熟可靠的存儲引擎,估計這讓他們深感痛處(尤其是目前最成熟的事務型引擎 InnoDB 又在 Oracle 手里)。MySQL 寄予厚望的 Falcon 在開發了兩年多之后,建樹不大,而該項目帶頭人 Jim Starkey 前不久又離開了 MySQL,陋屋偏逢連夜雨。
        Sun 會給 MySQL 一個穩健的引擎么? 我看短時間內未必能達到。除非,Sun 從 Oracle 手里把 InnoDB 買回來。如果進行大企業級應用,考慮到引擎本身的穩定性,似乎可選的也只有 InnoDB 了,但 InnoDB 的備份工具又是收費的。至于 MyISAM ,盡管有人的確喜歡用,但對于并發能力要求稍微嚴格一點,MyISAM 根本不行。

        在線 DDL 鎖表問題
        MySQL 中,在線對表對象做 DDL 操作是要鎖表的,對于可用性要求比較高,而應用變化又比較頻繁的環境,這是個非常很糟糕瓶頸。沒想到有什么好的辦法,除非,像大家開玩笑說的,把所有的表都預留出足夠的空閑列,減少類似增加列的變更麻煩。
        這個 MySQL 天生的缺陷在 PostgreSQL 中是不存在的,比如創建索引,可以用CREATE INDEX CONCURRENTLY 的方式來減小影響。(MySQL 后續的版本中在逐漸改善這個問題:添加了 ONLINE 關鍵字).這個看似是個小問題,但實際上卻是對很多人最為困擾的。

        在線備份問題
        MySQL 6.0 后終于具備在線備份的能力了。但現在,恐怕比較激進的用戶也只能用版本 5 而已。
        很多 MySQL 資深用戶能夠根據自己應用的特點布署適合自己的備份方式(盡管可能也會有缺陷,比如基于時間點的恢復)。
        至于另一個常用來衡量 DB 可擴展性的特性:分區,現在 MySQL 已經能夠支持了,盡管實現的的確有點晚。而使用 MySQL 的用戶,一般都采取 Sharding 的策略對數據進行切分,所以,分區的問題倒似乎并不是最為關鍵的。

            本文源自:http://www.boatsec.com 轉載請注明出處! 

      更多有關數據庫的技術交流請鏈接:http://www.boatsec.com/html/jsjl/sjk/ 
       
       


      本文由站河南北大青鳥校區整編而成,如需了解更多IT資訊類的文章、新聞、課程和學習技巧、就業案例、招生詳情等問題,可以對在線咨詢老師進行一對一問答!


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