Oracle SGA是oracle的内存结构,存放着oracle通过oracle进程读写的内存数据.sga分为好多组件,比如shared pool,buffer cache,redo log buffer等等.shared pool又分为library cache,data dictionary cache. library cache是存sql语句及其分析结果的内存结构 data dictionary cache是存放数据字典的内存结构 buffer cache存的就是数据. 我们分别来看这3…

asp.net  更新数据时报错:Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded 原因:Check your object, does it pass Primary Key Null. This Exception is Generally due thi…

在做datatables的项目,从后台取得数据后,返回给datatables界面时会报下面的错误: DataTables warning : Requested unknown parameter '0' from the data source for row 0 加上下面的设置就可以了,至于原理还不是很清楚. "aoColumnDefs": [{ sDefaultContent: '', aTargets: [ '_all' ]  }], var oTable = $("…

.bin/mysqld --initialize-insecure --basedir=xxx --datadir=xxx 然后 .bin/mysqld_safe --defaults-file=xxx --user=mysql & 抛错: InnoDB: auto-extending data file ./ibdata1 is of a different size 640 pages (rounded down to MB) than specified in the .cnf file:…

问题: 未能从程序集 C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Data.Entity.Build.Tasks.dll 加载任务“EntityClean”.未能加载文件或程序集“file:///C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Data.Entity.Build.Tasks.dll”或它的某一个依赖项.系统找不到指定的文件. 请确认 <UsingTask> 声明正确,该程…

问题描述: centos 安装MySQL $yum install mysql-server 安装之后执行命令mysql 报错: 查看mysql的启动日志: [ERROR] InnoDB: auto-extending data file ./ibdata1 is of a different size 640 pages (rounded down to MB) than specified in the .cnf file: initial 768 pages, max 0 (relevan…

2016-09-14T09:17:37.713955Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority(). 2016-09-14T09:17:37.724151Z 0 [ERROR] InnoDB: The Auto-extending innodb_system da…

现象如下:The innodb_system data file 'ibdata1' must be writable. 解决方案如下: 1.关闭mysqld进程: 2.删除配置文件中datadir所代表的目录下面的两个文件: 3.重启服务.输入命令:net start mysql57.当然也可以在服务管理界面中操作.…

重新安装percona5.7过程中,启动mysql服务总是报如下的错误 --10T02::.781070Z [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable --10T02::.781096Z [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable --10T02::.781103Z [ERROR] InnoDB: Pl…

新到一家公司,安装mysql5.7.20时候出现一个问题(安装步骤可以参考这个): ...mysql-5.7.20-winx64\data\is_writable’ Errcode: 2 - No such file or directory 看到这个问题大致是清楚是my.ini的目录写错了,但是无论怎么检查都不能看到问题出在哪. # 设置mysql的安装目录 basedir=D:\ruanjian\mysql-5.7.20-winx64 # 设置mysql数据库的数据的存放目录 datadir…