Every so often people ask me the question how should they estimate memory consumption by MySQL Server in given configuration. What is the formula they could use. 经常有人问我配置MySQL时该如何估算内存的消耗。那么该使用什么公式来计算
转载
精选
2009-05-27 15:56:17
8369阅读
#!/usr/bin/python#*coding:utf-8*names=['jack','tom','sherry']forlinnames:print(l)forxinrange(10):print(x
原创
2018-01-16 14:17:53
440阅读
Just as in mathematics, you can eliminate parentheses from SQL expressions. The following two querent:select * from employees where NOT (ename = 'BLAKE' AND init = 'R')sel
原创
2023-05-24 14:16:57
71阅读
#!/usr/bin/python#*coding:utf-8*age=int(input("inputyourage:"))ifage>=50:print('old')elifage>=25:print('adult')elifage>=6:print('teenager')else:print('ki
原创
2018-01-16 14:04:35
372阅读
MySQL, Incorrect usage of UNION and ORDER BY 错误解释:MySQL中,当你在使用UNION合并查询结果的时候,如果直接在最后使
原创
2024-10-10 12:18:24
31阅读
Q.How do I open and edit multiple files under VIM text editor running
under Ubuntu Linux / UNIX operating systems to improve my productivity?A. Vim offers multiple file
editing with the help of window
转载
精选
2014-08-28 12:16:18
1032阅读
EventBus is a publish/subscribe event bus optimized for Android.so make it simple,just think EventBus as a framework that allow different compoents to communicate,usually a subscribe register a certai
原创
2016-09-22 01:09:58
1099阅读
修改文件内容sed -i '/pattern/s/old/new/g' <file> #先筛选出满足pattern的字符串, 然后将该字符串钟的old替换为new修改多个文件名for file in *.c # 列出需要修改文件名的文件
do
nfile=`echo $file | sed 's/file/ma/g'`
mv $file $nfile
don
转载
2021-03-15 22:47:55
176阅读
2评论
dpkg -i package.deb安装包dpkg -r package删除包dpkg -P package删除包(包括配置文件)dpkg -L package列出与该包关联的文件dpkg -l package显示该包的版本dpkg –unpack package.deb解开 deb 包的内容dpkg -S keyword搜索所属的包内容dpkg -l列出当前已安装的包dpkg -c...
转载
2009-12-20 22:21:00
134阅读
2评论
ScheduledThreadPoolExecutor Usage
转载
2019-03-18 11:03:00
145阅读
2评论
1 使用kthread_create创建线程: struct task_struct *kthread_create(int (*threadfn)(void *data),
原创
2023-06-19 09:50:05
88阅读
impdb loads the dmp file from ORACLE_HOME/admin/ORACLE_SID/dpdump/test.dump, so before we run impdb, we put it into this folder.
oracle@laptop-ubuntu:/opt/oracle/admin/orcl/dpdump$ impdp sy
原创
2009-08-31 17:55:39
875阅读
#!/bin/bashread-p"pleaseinputanumber:"acase"$a"in1)echo"Thenumis1";;2)echo"Thenumis2";;[3-9])echo"Thenumis$a";;*)echo"pleaseinput[0-9]int"ex
原创
2018-01-22 11:54:07
503阅读
#!/bin/basharray=(12345)for((i=0;i<${#array[*]};i++));doecho${array[$i]}done
原创
2018-02-07 08:50:37
506阅读
Linux是一种开源的操作系统,拥有许多不同版本和发行版。其中,红帽(Red Hat)作为一个知名的Linux发行版,在众多企业和用户中被广泛应用。在红帽Linux中,有一个非常重要的函数叫做usage(),它在很大程度上帮助用户对系统资源的使用情况进行监控和管理。
首先,让我们来了解一下usage()函数的作用。在红帽Linux中,每个应用程序在运行的过程中都会占用系统资源,如CPU、内存、磁
原创
2024-03-11 10:35:38
83阅读
Tracing usage(Jin Qing’s Colu
原创
2023-06-15 16:53:16
109阅读