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Voice from An Old Soul

Voice from An Old Soul. 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談. 過年前一星期去了趟韓國協助那裡的同事為當地的大客戶做MySQL Cluster PoC，它的情境是一自個現有跑在另一個資料庫的應用系統移植過來，測試的環境架了一個有4個data node, 3個SQL node的MySQL Cluster。原有的應用系統有許多複雜的SQL命令(有derive table，join的base table和derrived 達62個)，也有的table有text格式的欄位，這兩點是我比較擔心的。果然執行這些SQL命令所需要的時間由0.x秒增加到5 6秒，而導入3萬多行到一個有text欄位的table需要2 3個小時。為此檢查這些SQL命令，發現其中有些重複的join，甚至還有些會産生cartesian product。經過以下的調優使PoC獲得還不錯的結果：. 在SQL node使用thread pool plugin (在my.cnf設plugin-load=thread pool.so). 透過MySQL的SQL MODE參數可以影響MySQL的行...

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Voice from An Old Soul | voicefromoldsoul.blogspot.com Reviews

<META> DESCRIPTION

Voice from An Old Soul. 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談. 過年前一星期去了趟韓國協助那裡的同事為當地的大客戶做MySQL Cluster PoC，它的情境是一自個現有跑在另一個資料庫的應用系統移植過來，測試的環境架了一個有4個data node, 3個SQL node的MySQL Cluster。原有的應用系統有許多複雜的SQL命令(有derive table，join的base table和derrived 達62個)，也有的table有text格式的欄位，這兩點是我比較擔心的。果然執行這些SQL命令所需要的時間由0.x秒增加到5 6秒，而導入3萬多行到一個有text欄位的table需要2 3個小時。為此檢查這些SQL命令，發現其中有些重複的join，甚至還有些會産生cartesian product。經過以下的調優使PoC獲得還不錯的結果：. 在SQL node使用thread pool plugin (在my.cnf設plugin-load=thread pool.so). 透過MySQL的SQL MODE參數可以影響MySQL的行...

<META> KEYWORDS

1 調整sql命令，排除cartesian product

2 張貼者：

3 杜修文 ivan tu

4 沒有留言

5 allow invalid dates

6 ansi quotes

7 如果沒設此mode以0當分母的算式會傳回null 也不會有warning

8 high not precedence

9 以下例解釋

10 ignore space

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調整sql命令，排除cartesian product,張貼者：,杜修文 ivan tu,沒有留言,allow invalid dates,ansi quotes,如果沒設此mode以0當分母的算式會傳回null 也不會有warning,high not precedence,以下例解釋,ignore space,加上引號後,no backslash escapes,no engine substitution,no field options,no key options,no zero date

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Voice from An Old Soul | voicefromoldsoul.blogspot.com Reviews

https://voicefromoldsoul.blogspot.com

Voice from An Old Soul. 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談. 過年前一星期去了趟韓國協助那裡的同事為當地的大客戶做MySQL Cluster PoC，它的情境是一自個現有跑在另一個資料庫的應用系統移植過來，測試的環境架了一個有4個data node, 3個SQL node的MySQL Cluster。原有的應用系統有許多複雜的SQL命令(有derive table，join的base table和derrived 達62個)，也有的table有text格式的欄位，這兩點是我比較擔心的。果然執行這些SQL命令所需要的時間由0.x秒增加到5 6秒，而導入3萬多行到一個有text欄位的table需要2 3個小時。為此檢查這些SQL命令，發現其中有些重複的join，甚至還有些會産生cartesian product。經過以下的調優使PoC獲得還不錯的結果：. 在SQL node使用thread pool plugin (在my.cnf設plugin-load=thread pool.so). 透過MySQL的SQL MODE參數可以影響MySQL的行...

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voicefromoldsoul.blogspot.com

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Voice from An Old Soul: 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談

http://voicefromoldsoul.blogspot.com/2015/02/mysql-cluster-poc.html

Voice from An Old Soul. 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談. 過年前一星期去了趟韓國協助那裡的同事為當地的大客戶做MySQL Cluster PoC，它的情境是一自個現有跑在另一個資料庫的應用系統移植過來，測試的環境架了一個有4個data node, 3個SQL node的MySQL Cluster。原有的應用系統有許多複雜的SQL命令(有derive table，join的base table和derrived 達62個)，也有的table有text格式的欄位，這兩點是我比較擔心的。果然執行這些SQL命令所需要的時間由0.x秒增加到5 6秒，而導入3萬多行到一個有text欄位的table需要2 3個小時。為此檢查這些SQL命令，發現其中有些重複的join，甚至還有些會産生cartesian product。經過以下的調優使PoC獲得還不錯的結果：. 在SQL node使用thread pool plugin (在my.cnf設plugin-load=thread pool.so). 訂閱：張貼留言 (Atom).

2

Voice from An Old Soul: 七月 2014

http://voicefromoldsoul.blogspot.com/2014_07_01_archive.html

Voice from An Old Soul. MySQL Fabric - 為您的應用系統提供高可用、高擴充性的資料庫. 65292;單從字面上似乎不太能看出它是啥咪碗糕，但是由名稱上還是有跡可循的，”. 能『組織』多個. 的表分散到多個資料庫 – 做. 做資料庫主從複製；進而在主資料庫當機時由各從資料中挑一個適合的提升為主資料庫，那麼其他的從資料庫自動轉向這個新的主資料庫找新的交易資料來複製。注意，這裡所說的『自動』是指由. 常常就是一個不得不為之惡。這麼大的表不論在查詢、更新的效率上，或是備份、更改結構所需要的時間上都會造成窒礙難行的問題。然而當您將這樣大的表分散到多個資料庫伺服器上，又會使每一台資料庫伺服器都可能是單點固障點，只要有一台當機就會使整個系統的查詢都會有問題，另一方面應用端的程式也會因為每個查詢都要依其查詢條件. 判斷要轉到那一個資料庫，右圖是這個方案的示意架構。這也許可以解決應用端程式複雜度的問題，但是當應用端的數量增加，資料庫分片增加或系統的壓力增加時，這個. 65292;每個查詢都會造成額外的負荷，而能降低應用系統的效能。 ORDER LINE JOIN PRODUCT.

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Voice from An Old Soul: 九月 2011

http://voicefromoldsoul.blogspot.com/2011_09_01_archive.html

Voice from An Old Soul. Oracle MySQL/Linux/Virtual Machine (LVM) Integrated Demo Script. MySQL Enterprise Monitor helps MySQL DBA managing the database, improving performance, and increase DBA's skill. It maximize the SLA of the database and help the DBAs increase their productivity. MySQL Proxy enable scale out solution by offering read-write splitting features in the most cost effective manner. MySQL replication helps the user increase availability and capacity of the database in a lowest cost. MySQL v...

4

Voice from An Old Soul: 八月 2014

http://voicefromoldsoul.blogspot.com/2014_08_01_archive.html

Voice from An Old Soul. MySQL小密訣 - 如何以SQL MODE使資料輸入更有效率:. 透過MySQL的SQL MODE參數可以影響MySQL的行為,使我們在輸入/匯入或更改資料時能使MySQL依我們希望的方式來處理資料.這個參數可在my.cnf或mysqld開機參數設定到整個資料庫,或在登入MySQL後以”set SQL MODE =;”的方式臨時改變MySQL對當下的連線的行為模式.這些SQL MODE中有指定個別特性的,也可組合性的以一個MODE代表好幾個特性的組合,同一個MySQL instance或連線可以有多個SQL MODE組合,例如”set SQL MODE=ANSI,NO ENGINESUBSTITUTE,STRICT TRANS TABLES;”.這些MODE可以使資料操作(例如自外部系統匯入資料)更方便,相反的也可能造成使用者的混肴或對MySQL的誤解.主要的指定個別特性的SQL MODE如下:. 能把“"”當成辨識字的引號就如同“`”一樣,在輸入的資料中有“字符時能使它順利輸入到MySQL. ERROR FOR DIVISION BY ZERO.

5

Voice from An Old Soul: 五月 2011

http://voicefromoldsoul.blogspot.com/2011_05_01_archive.html

Voice from An Old Soul. Benchmark MySQL 5.5.9 on Oracle Sun X4170 M2. The configuration of the system as below:. CPU: 6 Core Intel E5640 * 2, 2 threads with each core, 12 Cores/24 Threads in total. Hard Disk: 146GB * 2. Red Hat Enterprise Linux 5.6, with base kernel ( Linux Kernel 2.6.18-238.el5 ) 1st run, Oracle Enterprise Kernel ( Linux Kernel 2.6.32-100.26.2 el5) for the 2nd run. MySQL 5.5.9 Community Edition with InnoDB storage engine. Setup Sun X4170 M2. Install Red Hat Linux 5.6. New file format fr...

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Voice from An Old Soul. 決定MySQL Cluster 的效能的因素 - 在韓國的PoC的經驗談. 過年前一星期去了趟韓國協助那裡的同事為當地的大客戶做MySQL Cluster PoC，它的情境是一自個現有跑在另一個資料庫的應用系統移植過來，測試的環境架了一個有4個data node, 3個SQL node的MySQL Cluster。原有的應用系統有許多複雜的SQL命令(有derive table，join的base table和derrived 達62個)，也有的table有text格式的欄位，這兩點是我比較擔心的。果然執行這些SQL命令所需要的時間由0.x秒增加到5 6秒，而導入3萬多行到一個有text欄位的table需要2 3個小時。為此檢查這些SQL命令，發現其中有些重複的join，甚至還有些會産生cartesian product。經過以下的調優使PoC獲得還不錯的結果：. 在SQL node使用thread pool plugin (在my.cnf設plugin-load=thread pool.so). 透過MySQL的SQL MODE參數可以影響MySQL的行...

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