Jeff Janes: Hi, As part of our monitoring work for our customers, we stumbled upon an issue with our customers' servers who have a wal_keep_segments setting higher than 0. We have a monitoring script that checks the number of WAL files in the pg_xlog…

  Guillaume Lelarge: Hi, As part of our monitoring work for our customers, we stumbled upon an issue with our customers' servers who have a wal_keep_segments setting higher than 0. We have a monitoring script that checks the number of WAL files in th…

How do I increase the maximum number of open files under CentOS Linux? How do I open more file descriptors under Linux? The ulimit command provides control over the resources available to the shell and/or to processes started by it, on systems that a…

Installing on RPM-based Linux (RHEL, CentOS, Fedora, openSUSE) — RabbitMQ https://www.rabbitmq.com/install-rpm.html ulimit -n 1024 Controlling System Limits on Linux RabbitMQ installations running production workloads may need system limits and kerne…

1.INFO: Maximum number of threads (200) created for connector with address null and port 8091 说明:最大线程数错误 解决方案: 使用线程池,用较少的线程处理较多的访问,可以提高tomcat处理请求的能力.使用方式: 首先.打开/conf/server.xml,增加 <Executor name="tomcatThreadPool" namePrefix="catalina-ex…

1.INFO: Maximum number of threads (200) created for connector with address null and port 80 说明:最大线程数错误 解决方案: 使用线程池,用较少的线程处理较多的访问,可以提高tomcat处理请求的能力.使用方式: 首先.打开/conf/server.xml,增加 <Executor name="tomcatThreadPool" namePrefix="catalina-exec…

[root@localhost ~]# vi /etc/security/limits.conf # /etc/security/limits.conf # #Each line describes a limit for a user in the form: # #<domain> <type> <item> <value> # #Where: #<domain> can be: # - a user name # - a group nam…

问题描述:在正式生产环境中,有的库建的process和session连接数目设置的较小,导致后期满了无法连接.因为正式库无法进行停库修改,只能释放连接,做个测试模拟 1. 修改现有最大会话与进程连接数 SQL> alter system set processes = 35 scope = spfile; System altered. SQL> alter system set sessions = 40 scope = spfile; System altered. 2.重启生效,加大连接…

真机调试免费App ID出现的问题The maximum number of apps for free development profiles has been reached.免费应用程序调试最大限度苹果免费App ID只能运行2个应用程序,当调试第三个的时候就会报这个错误,必须把之前的应用程序删除,才能调试新的 解决办法:1.连接iPhone 打开Xcode->Window->Devices     2.接着出现这个界面   3.删除其中一个,不是本次运行的应用程序 4.接着会弹框  …

Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n). Example 1: Input: [3, 2, 1] Output: 1 Explanation: The third maximum is 1. Examp…