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獅子輓歌

Http:/ jackyshih.pixnet.net/blog/post/5839238-sql-server-index%E6%9E%B6%E6%A7%8B%E8%AE%80%E5%BE%8C%E5%BF%83%E5%BE%97. 註記:原先已經知道index 是用B-tree的資料結構去組成，但不是很清楚何時該給哪個欄位下index，只知道是常查詢的欄位或是唯一是別值。 1更新頻率過高的欄位，因為clustered index 每次更新都會對實體資料進行sort，如果資料量大，sort time 會花不少時間處理，所以不建議。 1連續性的範圍查詢結果：因為實體資料是按照鍵值依序地存入HD中，若依Between = = 等符號查詢時，當系統找到第一筆資料後，依序逐筆往下讀取，查詢的結果是連續性的範圍，則執行的速度也會提升。 3會用於order by or group by 指令中，若索引見值常用於order by 與 group by 中時，因為實體資料已經排序好了，系統不在進行排序動作，所以會增加執行的速度。張貼者： Lichain Yu. OS X 安裝 MySQLdb for Python.

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獅子輓歌 | redwing0.blogspot.com Reviews

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Http:/ jackyshih.pixnet.net/blog/post/5839238-sql-server-index%E6%9E%B6%E6%A7%8B%E8%AE%80%E5%BE%8C%E5%BF%83%E5%BE%97. 註記:原先已經知道index 是用B-tree的資料結構去組成，但不是很清楚何時該給哪個欄位下index，只知道是常查詢的欄位或是唯一是別值。 1更新頻率過高的欄位，因為clustered index 每次更新都會對實體資料進行sort，如果資料量大，sort time 會花不少時間處理，所以不建議。 1連續性的範圍查詢結果：因為實體資料是按照鍵值依序地存入HD中，若依Between = = 等符號查詢時，當系統找到第一筆資料後，依序逐筆往下讀取，查詢的結果是連續性的範圍，則執行的速度也會提升。 3會用於order by or group by 指令中，若索引見值常用於order by 與 group by 中時，因為實體資料已經排序好了，系統不在進行排序動作，所以會增加執行的速度。張貼者： Lichain Yu. OS X 安裝 MySQLdb for Python.

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1 獅子輓歌

2 紀錄一些問題紀錄會更新

3 1如何去下sql index

4 上面有解答，在此節錄出來

5 clustered index 設計守則

6 盡量排除：

7 2獨特性過高的欄位：沒意義

8 建議列入設計考量：

9 以查詢考量分

10 2會用於join指令中的欄位建議加入，一般都是foreign key

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獅子輓歌,紀錄一些問題紀錄會更新,1如何去下sql index,上面有解答，在此節錄出來,clustered index 設計守則,盡量排除：,2獨特性過高的欄位：沒意義,建議列入設計考量：,以查詢考量分,2會用於join指令中的欄位建議加入，一般都是foreign key,以欄位考量,1單一性 unique 或多個得特性欄位的組合,3被定義成identity欄位,以上是clustered index 部分,以電子郵件傳送這篇文章,blogthis！,分享至 twitter,分享至 facebook

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獅子輓歌 | redwing0.blogspot.com Reviews

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Http:/ jackyshih.pixnet.net/blog/post/5839238-sql-server-index%E6%9E%B6%E6%A7%8B%E8%AE%80%E5%BE%8C%E5%BF%83%E5%BE%97. 註記:原先已經知道index 是用B-tree的資料結構去組成，但不是很清楚何時該給哪個欄位下index，只知道是常查詢的欄位或是唯一是別值。 1更新頻率過高的欄位，因為clustered index 每次更新都會對實體資料進行sort，如果資料量大，sort time 會花不少時間處理，所以不建議。 1連續性的範圍查詢結果：因為實體資料是按照鍵值依序地存入HD中，若依Between = = 等符號查詢時，當系統找到第一筆資料後，依序逐筆往下讀取，查詢的結果是連續性的範圍，則執行的速度也會提升。 3會用於order by or group by 指令中，若索引見值常用於order by 與 group by 中時，因為實體資料已經排序好了，系統不在進行排序動作，所以會增加執行的速度。張貼者： Lichain Yu. OS X 安裝 MySQLdb for Python.

INTERNAL PAGES

redwing0.blogspot.com

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獅子輓歌: [ubuntu][wirelsee driver]MacPro

http://redwing0.blogspot.com/2012/07/ubuntuwirelsee-drivermacpro.html

Http:/ linuxwireless.org/download/compat-wireless-2.6/compat-wireless-2.6.tar.bz2. Http:/ pkgs.fedoraproject.org/repo/pkgs/b43-fwcutter/b43-fwcutter-. 015tar.bz2/628e030565222a107bc40300313cbe76/b43-fwcutter-015.tar.bz2. Http:/ www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2. 張貼者： Lichain Yu. 訂閱：張貼留言 (Atom). 好用的線上code編輯器（含編譯，超過40種）. Python][mysql]install mysqldb fail : EnvironmentError: mysql config not found. Android][筆記] Android Debug certificate expired. Awesome Inc.範本. 由 Blogger.

2

獅子輓歌: [vim]寫js的vim script

http://redwing0.blogspot.com/2013/07/vimjsvim-script.html

寫 Javascript 可用的 Vim Script. OOP javascript indentation : This indentation script for OOP javascript (especially for EXTJS). JavaScript syntax : Better JavaScrirpt syntax support. Javascript Indentation : Indentation for Javascript. 張貼者： Lichain Yu. 訂閱：張貼留言 (Atom). 好用的線上code編輯器（含編譯，超過40種）. Python][mysql]install mysqldb fail : EnvironmentError: mysql config not found. Awesome Inc.範本. 由 Blogger.

3

獅子輓歌: [win7]fixboot and fixmbr

http://redwing0.blogspot.com/2010/10/win7fixboot-and-fixmbr.html

張貼者： Lichain Yu. 訂閱：張貼留言 (Atom). 好用的線上code編輯器（含編譯，超過40種）. Python][mysql]install mysqldb fail : EnvironmentError: mysql config not found. Ref 人生的每一件事情做或不做，都只需要閉上眼睛想一秒鐘就夠了！ Awesome Inc.範本. 由 Blogger.

4

獅子輓歌: 十月 2013

http://redwing0.blogspot.com/2013_10_01_archive.html

Python][mysql]install mysqldb fail : EnvironmentError: mysql config not found. OS X 安裝 MySQLdb for Python. 解决mysql config not found錯誤. 剛剛要安裝MySQLdb for python on mac. 結果中途出現 [EnvironmentError: mysql config not found]. 收尋一下自己mac上mysql config位置是在：/usr/local/mysql/bin/mysql config. 1 Download MySQLdb (MySQL-python-1.2.4b4.tar.gz). 2 tar -zxvf MySQL-python-1.2.4b4.tar.gz. 3 cd MySQL-python-1.2.4b4. 4 python setup.py build = error. 5 vim site.cfg 找到 mysql config = xxxxxx (換成自己mysql config位置).

5

獅子輓歌: [python][mysql]install mysqldb fail : EnvironmentError: mysql_config not found

http://redwing0.blogspot.com/2013/10/pythonmysqlinstall-mysqldb-fail.html

Python][mysql]install mysqldb fail : EnvironmentError: mysql config not found. OS X 安裝 MySQLdb for Python. 解决mysql config not found錯誤. 剛剛要安裝MySQLdb for python on mac. 結果中途出現 [EnvironmentError: mysql config not found]. 收尋一下自己mac上mysql config位置是在：/usr/local/mysql/bin/mysql config. 1 Download MySQLdb (MySQL-python-1.2.4b4.tar.gz). 2 tar -zxvf MySQL-python-1.2.4b4.tar.gz. 3 cd MySQL-python-1.2.4b4. 4 python setup.py build = error. 5 vim site.cfg 找到 mysql config = xxxxxx (換成自己mysql config位置).

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獅子輓歌

Http:/ jackyshih.pixnet.net/blog/post/5839238-sql-server-index%E6%9E%B6%E6%A7%8B%E8%AE%80%E5%BE%8C%E5%BF%83%E5%BE%97. 註記:原先已經知道index 是用B-tree的資料結構去組成，但不是很清楚何時該給哪個欄位下index，只知道是常查詢的欄位或是唯一是別值。 1更新頻率過高的欄位，因為clustered index 每次更新都會對實體資料進行sort，如果資料量大，sort time 會花不少時間處理，所以不建議。 1連續性的範圍查詢結果：因為實體資料是按照鍵值依序地存入HD中，若依Between = = 等符號查詢時，當系統找到第一筆資料後，依序逐筆往下讀取，查詢的結果是連續性的範圍，則執行的速度也會提升。 3會用於order by or group by 指令中，若索引見值常用於order by 與 group by 中時，因為實體資料已經排序好了，系統不在進行排序動作，所以會增加執行的速度。張貼者： Lichain Yu. OS X 安裝 MySQLdb for Python.

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