最近遇到了幾次MySQL服務崩潰重啟。昨天就連續遇到兩次。 第一次的err日誌:81122 16:16:47 - mysqld got signal 11 ;This could be because you hit a bug. It is also possible that this binaryor one of the libraries it was linked against is corrupt, improperly built,or misconfigured. This
mysql 預設遞迴層數為0 所以設計到遞迴要把一些資源整理在這裡方便以後使用:三種迴圈 http://www.cnblogs.com/zfying/archive/2011/11/30/2268820.htmlmysql中的暫存資料表不能同時被兩次開啟,也就是cann't reopen,參看http://www.2cto.com/database/201206/135895.htmlMySQL procedure 與 function 的區別 http://www.cnblogs.com/
系統版本資訊:# mysql -Vmysql Ver 14.12 Distrib 5.0.32, for pc-linux-gnu (i486) using readline 5.2# uname -aLinux auto-at-server 2.6.18-6-686 #1 SMP Tue Jun 17 21:31:27 UTC 2008 i686 GNU/Linux重啟Mysql報錯如下:# /etc/init.d/mysql restart* Stopping MySQL
MySQL中匯出CSV格式資料的SQL語句樣本如下:Sql代碼 select * from test_info into outfile '/tmp/test.csv' fields terminated by ',' optionally enclosed by '"' escaped by '"' lines terminated by '\r\n'; select * from test_info into outfile '/tmp/test.csv' fields
我們知道,MYSQL 5.1開始支援水平資料分割功能。 我們來嘗試下如何在已經分區的表上面做查詢最佳化。總體來說,最佳化的原則和對單獨的表做最佳化是一樣的,保證對磁碟上表的掃描次數減小。我們的表結構如下:這裡已經插入2W多行資料進行測試。看看這條查詢。SELECT * FROM t1 WHERE system_type IN (1,2)UNION ALLSELECT * FROM t1 WHERE system_type =
[WARN ] HouseKeeper 2010-05-13 11:52:17,781 org.logicalcobwebs.proxool.MySql - #0005 was active for 3634735 milliseconds and has been removed automaticaly. The Thread responsible was named 'http-7085-Processor22', and the last SQL it
/*參數:插入記錄的起始ID,客戶ID,記錄數,初始使用者名稱*/DELIMITER $$CREATE PROCEDURE batchInsert(IN init INT , IN cid INT , IN loops INT , IN username VARCHAR(64))BEGINDECLARE myid INT;DECLARE myname VARCHAR(64);DECLARE num INT;SET myid = init;SET myname = username;SET
Enter password: ******Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 57Server version: 6.0.4-alpha-community-log MySQL Community Server (GPL)Type 'help;' or '\h' for help. Type '\c' to clear the buffer.mysql>