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1. Distinguish between read lock and write lock.If you use a write lock every time, it is not efficient to queue up multiple processes to read a file.2. Distinguish between blocking and non-blocking modes.In general, if a process is writing a file,

Source: VBS SHOP The first method: Ping 127.0.0.1-n 5000>nul Dir c:\ >c:\1.txt 5 minutes delay to execute dir c:\ The second method :: sleep.bat-sleep/delay/wait N seconds :: Herbert Kleebauer (Germany)-2005/05/29 :: Modified by would sort-2005/

The first method: Ping 127.0.0.1-n 5000>nul Dir c:\ >c:\1.txt 5 minutes delay to execute dir c:\ The second method :: sleep.bat-sleep/delay/wait N seconds :: Herbert Kleebauer (Germany)-2005/05/29 :: Modified by would sort-2005/06/02 @echo

With PHP you can easily connect to the database, request the data and display it in your Web site, or even modify the data in the database. MySQL is a very popular database, and there are many tutorials about PHP and MySQL on the internet. MySQL is

PHP$DBI=NewDbmysql;$DBI->DBH = ' Mysql://root:[email protected]/coffeetest ';$map=Array();$DBI->fetchmap ("SHOW TABLES",$map);$tables=Array_keys($map);//Find tables containing CID fields$cid _tables=Array(); for($j= 0;$jCount($tables);$j++){

Tool Name: mysqlha_sysbench.shTool use: For MySQL stress testing (2 functions: Fill data && test data)Tool Parameters:Options-P port to test-D DB name to test-h host to be tested-S Fill && test table data volume, default 100w-c Number of fill &&

A file test is a test of whether a file or directory existsTest file format [operator directory or file] Note that there is a space between the opening parenthesis and the operator, and there is a space between the file or directory and the

Php:It is usually the beginning of the code you want to check to record a time, the end of the record a time. Take the difference value,the efficiency of database SQLSQL explain (MySQL), enable slow query log to record slow queries. Usually also

Php_i love u (1) php Food and clothing parents: Java and PHP efficiency battle one:Fibonacci sequenceFibonacciEXPLANATION See: http://zh.wikipedia.org/wiki/%E6%96%90%E6%B3%A2%E9%82%A3%E5%A5%91%E6%95%B0%E5%88%97 (should be 1, Wiki's formula

1. Create a groupIncrease the Oinstall group, specifying the group ID. [[email protected] ~]# groupadd-g 1023 oinstall add Oper system group. [Email protected] ~]# groupadd-r oper2. Delete a group[Email protected] ~]# Groupdel oper3. Modify the

SysRqUseSYSRQ is called the "Magic key combination" and is a debugging tool built into the Linux kernel. As long as the kernel is not fully locked, no matter what the kernel is doing, using these key combinations can collect system operation

functions: Function functions are statement blocks consisting of several shell commands for code reuse and modular programming1) Definition of function:Can be defined in the command line, part of the script, only in a separate file of the

Fixed version:#!/bin/sh#check memcache process and restart if downMm_bin= "/usr/local/bin/memcached"Mm_log= "/home/xxx/memcached_check.log"mm_ports= ("11211" "11212")Mm_param= ("-d-m 20480-p 11211-u www" "-d-m 256-p 11212-u www")mm_count=${#mm_ports

To configure a custom execution script in a system developed today with Yii 1. Configure the components that are needed in the product/config/console.php, like database connections ' DB ' =>array (' connectionString ' = '

The terminal is the window where the user interacts with the shell environment, and most of the interaction results are displayed directly to the user from the terminal, so this is the basis for the friendly display results.1. Overview of

The concept of polymorphism, in the Java middle finger is the type of object the variable can point to, but a subclass of the variable declaration type. Once an object is created, its type is invariant and polymorphism is a variable.In PHP5, the

The problem that colleagues encounter today is to call a Java method with JRuby, which uses the jdk1.5 variable parameters. I thought it would be simple to represent a variable parameter as an array, such as the following two Java classes: public

IntroducedPHP is a very amazing language. It's strong enough (the core language of the biggest blog (WordPress)), it's wide enough (running on Facebook, the biggest social networking site), and it's simple enough (as a beginner's preferred starter

People who use PHP know that Zend encode is a scripting tool, the program written in it must be placed on the Web server in the form of a source, so we can't protect our source code. It is well known that the execution efficiency of any script

Chr function is used to convert ASCII code to characters The ORD function is used to convert characters to ASCII code ASCII code is the computer can display the character of the code, its value range is 0-255, including punctuation, letters,