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linux下清除svn的用户名和密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
linux下清除svn的用户名和密码问题：之前用的svn账号权限不够，需要使用别的账号，所以提出需求——怎么使用新的svn账号进行操作方法一：linux下删除~ subversion auth 问题：之前用的svn账号权限不够，需要使用别的账号，所以...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...使用ext3，可能会遇到这类问题，所以还是大概介绍一下如何解决：
MongoDB按需自动生成数据文件：先是<DB>.0，大小是64M，然后是<DB>.1，大小翻番到128M，到了<DB>.5，大小翻番到2G，其后的数据文件就保持在2G大小。为了避免可能出...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...户名
可选：用于身份验证的用户名。
UserPasword - 用户密码
可选：用于身份验证的用户密码。
SSL/TLS：服务器身份验证
使用 受信任的证书文件 和 信任库文件 属性设置服务器身份验证（使用 SSL/TLS 协议）。
受...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...EC2 Linux Micro instance. Since Micro instances have only 613MB of memory, MySQL crashed every now and then. After a long search about MySQL, Micro Instance and Memory Managment I found out there is no default SWAP space for Micro instance. So if you want to avoid the crash you may need to setup a s...
phpcms v9与ucenter通信失败 完美解决 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...名：root （必填，视实际情况而定）
Ucenter 数据库密码：root （视实际情况而定）
Ucenter 数据库名：discuz （必填，视实际情况而定）
Ucenter 数据库表前缀：`discuz`.pre_ucenter_ （必填，视实际情况而定。如果此...
Apache .htaccess 禁止访问某目录方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...要利用.htaccess对某个目录下的文档设定访问用户和对应的密码，首先要做的是生成一个.htpasswd的文本文档，使用
htpasswd -c d:/passwords wwq
输入用户密码即可生成.htpasswd的文本文档
在.htaccess文件中加入：
AuthType Basic
AuthName "Restric...
Is there any difference between GROUP BY and DISTINCT
...CT and distinct by UNION cause an oracle error, but GROUP BY worked; I was selecting only 1 column from a view and not using any aggregation; I'm still baffled why it required it, but it does confirm there is some difference in the execution. As others point out, it also lets you GROUP BY columns no...
PHP and MySQL - how to avoid password in source code? [duplicate]
I have a small PHP application storing data in a MySQL database. Currently username / password are hard-coded in the PHP code. A situation I do not really like, for example, since the code is also available in a repository.
...
How can prepared statements protect from SQL injection attacks?
...ample shows it (all examples in PHP/Mysql):
$expected_data = 1;
$query = "SELECT * FROM users where id=$expected_data";
will produce a regular query
SELECT * FROM users where id=1
while this code
$spoiled_data = "1; DROP TABLE users;"
$query = "SELECT * FROM users where id=$spoiled_da...
What's wrong with nullable columns in composite primary keys?
...ow in a table: when a table has a primary key, you have a guranteed way to select any row from it.
A unique constraint does not necessarily identify every row; it just specifies that if a row has values in its columns, then they must be unique. This is not sufficient to uniquely identify every row...