chainsaw execution

1. Specify the script interpreter at the beginning#!/bin/bash or #!/bin/sh2, and then add version information, etc.#Date: 2016-12-27#Author: sadoc.blog.51cto.com#Mail: [Email protected]#Function: Scripting Features#Version: VersionThe script is named after the. sh extension"source" and " . "Load the executed script, the variable (including function) value in the script after the end of the script still exists in the current shell,"sh" and" bash "is notGlobal variables:/etc/profile variables und

Document with its own method: Loop execution: var Timeid = Window.setinterval ("Method name or method", "delay"); Window.clearinterval (Timeid); Timed execution: var tmid = Window.settimeout ("Method name or method", "delay"); Window.cleartimeout (Tmid); An example is provided: A. When a parameter is not required in the method to be executed Copy Code code as follows: B. When param

Implementing the PHP compilation Execution separation (separating compilation and execution) Just in the PHP group and we chat, promised everyone to write an article on how to implement the PHP source code encryption, through this will be the opportunity for QA in the smoke, on this issue, I write some ideas.As I've described in previous articles, ZE (Zend engine) executes a PHP script that goes through c

Php is relatively late, so I don't know how to execute the previous version in php-cgi mode, and I have never used FastCGI. so I would like to ask two questions: (1) what is the difference between php execution in the apache module and php-cgi execution? I am currently using the local macosx module for execution: {code... using php is relatively late, so I am not

PHP execution process, PHP execution PHP Execution Process The source code computer in any language has no way to execute directly, and it needs to be converted into machine instructions that the computer can recognize. PHP is also a high-level language and needs to be compiled (explained) The parsing process for PHP: 1, the request source code, carries on

Explanation of MySQL execution plan, mysql execution planExplain syntax Explain select ...... Variant: 1. explain extended select ...... Decompile the execution plan into a SELECT statement and run show warnings to obtain the query statement optimized by the MySQL optimizer. 2. explain partitions select ...... Used to EXPLAIN the Partition Table Information cont

About asynchronous execution of js and about asynchronous execution of js 1. The execution environment of the Javascript language is "single thread ): Advantages: The implementation is relatively simple, and the execution environment is relatively simple; Disadvantage: As long as a task takes a long time, the subsequen

The ajax processing method for asynchronous PHPajax execution without waiting for execution results. The processing method of PHPajax asynchronous execution that does not wait for the execution result. in the ajax processing method for generating an application with a short address, a web snapshot is generated based on

,Let's build this one. Index: CREATE index idx_col2_col3 on Teststatistics(col2,col3)Executes a query that is estimated to be 4127.86 rowsThen drop the index above and continue creating an index: Create index idx_col3_col2 on Teststatistics(col3,col2)Note that the order of COL2 and COL3 is inconsistentContinue execution of the above query (the query condition is unchanged, the data is unchanged, only the index column order has changed), this time is e

Linux shell execution principle, linuxshell executionShell Introduction Shell is a system user interface that provides an interface for users to interact with the kernel. It receives user-input commands and sends them to the kernel for execution.Running background A basic linux System Structure B. It can be seen that shell is in an intermediate level in the system. It provides a solution for the interaction between users and kernel. C. Many adva

Inaccurate MySQL execution plan-Overview, mysql execution plan The execution plan for the Mao MySQL optimizer is often inaccurate, but not optimal (cpu + io )??? Too many factors :: The information of information_schema is regularly refreshed. In many cases, it is not the most authentic, or even the difference is very large (when it is not a mountain peak, make

Getting started If you are not SysAdmin, dbcreator, or db_owner, you need the permission to view the execution plan. GRANT SHOWPLAN TO [username] The first example is very simple. Open Management studio and type the following query SELECT *FROM [dbo].[DatabaseLog]; Click the display estimated execution plan button on the action bar to view our first estimated execution