一、mysql group commit 的官方定義: InnoDB, like any other ACID-compliant database engine, flushes the redo log of a transaction before it is committed. InnoDB uses group commit functionality to group multiple such flush requests together to avoid o
當業務邏輯越來越復雜時,這個查詢的需求會越來越多,今天寫成筆記記錄下來,防止再忘記 SELECT * FROM `notice` a where add_time > 1513008000 and admin_id >= 1 and admin_id <= 10 and status = 0 and 3 > (SELECT C
我們在寫數據庫程序的時候,經常會需要獲取某個表中的最大序號數,mysql字符串?一般情況下獲取剛插入的數據的id,使用select max(id) from table 是可以的。但在多線程情況下,就不行了。下面介紹三種方法(1)?getGeneratedKeys()方法:程序片斷:Connection?conn
修改登錄密碼;進入mysql系統數據庫:mysql> use mysqlReading table information for completion of table and column namesMySQL最新版本。You can turn off this feature to get a quicker startup with -ADatabase changed修改root賬戶密碼:mysql&
報錯內容主要是:EnvironmentError: mysql_config not foundCommand "python setup.py egg_info" failed with error code 1 in /private/var/folders/nh/j05szmpj19368dd9_y6whgy40000gq/T/pip-install-n9Jonx/mysql-python/網上查了執行一個什么環境變量的命令:expor
general log&slow query log對于MySQL的一般查詢日志和慢查詢日志,開啟比較簡單,其中公用的一個參數是log_output,log_output控制著慢查詢和一般查詢日志的輸出方向 可以是表(mysql.general_log,mysql.slow_log)或者文件(有參數general_log_file和sl