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How do you create a read-only user in PostgreSQL?
...test versions of PostgreSQL, you can grant permissions on all tables/views/etc in the schema using a single command rather than having to type them one by one:
GRANT SELECT ON ALL TABLES IN SCHEMA public TO xxx;
This only affects tables that have already been created. More powerfully, you can aut...
ORACLE 启动提示 内存不足 OUTOF MEMORY - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
ORACLE 启动提示 内存不足 OUTOF MEMORY原配置 etc sysctl.conf文件kernel.shmall = 2097152kernel.shmmax = 2147483648kernel.shmmni = 4096kernel.sem = 250 32000 10...
原配置 /etc/sysctl.conf文件
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kerne...
[解决]MySql提示:The server quit without updating PID file(…)失败 - 数...
...rekfan.com/?p=186
4.mysql在启动时没有指定配置文件时会使用/etc/my.cnf配置文件，请打开这个文件查看在[mysqld]节下有没有指定数据目录(datadir)。
解决方法：请在[mysqld]下设置这一行：datadir = /usr/local/mysql/data
5.skip-federated字段问题
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解决：error while loading shared libraries: libpcre.so.1: cannot open ...
...件的位置（可以使用命令 whereis xxx ），并把目录添加到/etc/ld.so.conf.d/libc.conf中，没有则新建这个文件。然后再运行ldconfig才可以生效。
解决：用以下shell命令解决：（用root用户）
echo "/usr/local/lib" >> /etc/ld.so.conf.d/libc.conf
sudo...
Linux下追踪程序退出(崩溃)思路 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
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历史命令默认会保存1000条，如果觉得太少，可以修改/etc/profile中HISTSIZE=1000，改成你想要的值。
注意：history只针对登录用户下执行有效，即使root用户也无法得到其它用户histotry历史。当然，还是有办法记录所有登陆用户的...
基于内网外隔离的微信推送解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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端口转发配置
安装rinetd 请自行百度
编辑配置vi /etc/rinetd.conf
启动程序
pkill rinetd ##关闭进程
rinetd -c /etc/rinetd.conf ##启动转发
把这条命令加到/etc/rc.local里面就可以开机自动运行
查看状态
netstat -antup
tomca...
Linux MySql编译安装 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
cd support-files/
cp my-default.cnf /var/mysql/my.cnf
cp mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/init.d/mysqld
chkconfig --level 345 mysqld on
#初始化数据库
/usr/local/mysql/scripts/mysql_install_db \
--defaults-file=/etc/my.cnf \
--basedir=/usr/local/mysql \
--datadir...
Mac 下载安装Redis - 更多技术 - 清泛网 - 专注C/C++及内核技术
...文件以及对配置文件进行修改
sudo cp redis.conf /private/etc/
sudo vi /private/etc/redis.conf
找到daemonize 把 后面的no改成yes，不然每次启动会占用一个终端的session。
其他的配置根据需要来。我这里不啰嗦。然后 :wq 保存退出。
E....
How to duplicate sys.stdout to a log file?
...ty to write to multiple log files at once, or handle different log levels, etc.
These are all straightforward enough that I'm comfortable leaving them as exercises for the reader. The key insight here is that print just calls a "file-like object" that's assigned to sys.stdout.
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Difference between /res and /assets directories
...ng alternatives for different languages, OS versions, screen orientations, etc., as described here. None of that is available with assets. Also, many parts of the API support the use of resource identifiers. Finally, the names of the resources are turned into constant field names that are checked at...