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Understanding the javascript_04 _ Data Model

); var numconstructor1 = number. constructor; // Orvar numconstructor2 = new object (123 ). constructor; // both numconstructor1 and numconstructor2 are the build-in number constructornumconstructor1 = numconstructor2 // result: True // access the build-in object constructorvar objconstructor1 = {}. constructor; // Orvar objconstructor2 = new object (). constructor; // both objconstructor1 and objconstructor2 are the build-in object constructorobjconstructor1 = objconstructor2 // result: True

Redis. conf

used as a real# Database the memory usage will grow over the weeks, it will be obvious if# It is going to use too much memory in the long run, and you'll have the time# To upgrade. With maxmemory after the limit is reached you'll start to get# Errors for write operations, and this may even lead to DB inconsistency.## Maxmemory ############################# Append only mode ####### ######################## # By default redis asynchronously dumps the

Java Multithreading and Concurrency basics interview questions and Answers

,kill-3 command, Jstack tools, and so on. I prefer the Jstack tool because it is easy to use and comes with a JDK. Since it is a terminal-based tool, we can write some scripts to generate thread dumps periodically for analysis. Read this document to learn more about generating thread dumps .23. What is a deadlock (Deadlock)? How do I analyze and avoid deadlocks?Deadlocks are situations in which more than tw

Redis configuration file redis. conf

, and in turn the output # Buffer of slaves is full with DELs of keys evicted triggering the deletion # Of more keys, and so forth until the database is completely emptied. # # In short... if you have slaves attached it is suggested that you set a lower # Limit for maxmemory so that there is some free RAM on the system for slave # Output buffers (but this is not needed if the policy is 'noeviction '). # Set the maximum memory available for redis. When the memory is full, if you still receive the

Redis configuration file redis. conf detailed description, redisredis. conf

asynchronously dumps the dataset on disk. if you can live # with the idea that the latest records will be lost if something like a crash # happens this is the preferred way to run Redis. if instead you care a lot # about your data and don't want to that a single record can get lost you shoshould # enable the append only mode: when this mode is enabled Redis will append # every write timeout Ation already ed in the file appendonly. aof. this file will

Basic windbg-3. analysis and diagnosis of high CPU

View Code First: Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 Using System; 2 Using System. Threading; 3 4 Namespace Highcpu 5 { 6 Class Program 7 { 8 Static Void Main ( String [] ARGs) 9 { 10 Console. Clear (); 11 Console. writeline ( " Go to the command line, switch to the windbg directory, and run adplus-Hang-PN highcpu.exe-o c: \ dumps

Refactoring Example 1: extracting redundant code-the second correction without passing the test

class must be passed in during calling. 30 Def Post (self, Action ): 31 Wi = Web. Input () 32 33 Userid = self. servertoken. userid # The subclass obtains the variable containing the identity information. This variable is created by the parent class and obtained through the attribute. 34 35 If Action =" Person " : # Use action 36 List = Tnuser. User. getpersonfolders (dB, userid) 37 Return ' {"Result": "OK", "message": "", "data": % s} '

Explanation of the redis configuration file

redis asynchronously (asynchronous) dumps the dataset on disk. If you can live # With the idea that the latest records will be lost if something like a crash # Happens this is the preferred way to run redis. If instead you care a lot # About your data and don't want to that a single record can get lost you shoshould # Enable the append only mode: When this mode is enabled redis will append # Every write operation completed ed in the file appendonly.

Django rest framework1

Content review: 1. development Mode-general development mode (with the frontend and backend written together)-frontend and backend separation 2. backend development provides a URL for the front end (API/interface development). Note: httpresponse3.django fbv, CBV fbv, function base view def users (request): user_list = ['Alex ', 'oldboys'] Return httpresponse (JSON. dumps (user_list) CBV, class base view routing: URL (R' ^ students/', views. studentsvi

Dumpbin. exe

/CLR. Remarks Clrheader displays information about. Net headers used in any hosting program. The output shows the. NET header and the position and size of each section (in bytes ). File Format spec.doc describes the information in the. NET header. Install file format spec.doc in the tools developers Guide directory. Only the/headers dumpbin option can be used for files generated by the/GL compiler option. /DIRECTIVES This option dumps the. ctictive

Dump File generation and analysis

/wangyangtao/archive/2010/03/08/5355841.aspx Of course, my approach is different from the above two URLs (based on learning the above). My detailed practices are as follows: (1) install windbg (A) download and install windbg (the installation method is not described in detail) (B) Open windbg, file/attach to a process/and then show the required route (.exe) (C) When the program crashes, run the dump command to generate the DMP file. The Commands include :. dump/m c:/

A detailed description of serialization and deserialization

, but since serialization and deserialization are implemented in the same program, there is no eval () in other programs, but JSON supports all programming languages, Therefore, it is common to use JSON to implement information interaction between different programming languages. Dump and load also implement the above dumps and loads functions, but not the same way of implementation, the syntax is slightly different, as follows: Dump Serialization:   

tcpdump Command Usage Introduction

Grammar:tcpdump (option)Options:-A prints out all the groupings in ASCII format and minimizes the head of the link layer.-A: Attempts to convert the network and broadcast addresses into names;-c- D: converts the compiled packet encoding into a readable format and dumps it to the standard output;-DD: Converts the compiled packet encoding into the C language format and dumps it to the standard output;-DDD: Co

Lynis Check Log

Lynis CheckSystem ToolsCheck System executable program environment variable path Boot and ServicesGRUB2 menu entry into single user mode already set password The other is to check the start of the service, is currently running 24 services, boot start is 21 services* Service Script directory:/lib/systemd/system/* Service file permissions: 0644 KernelRunLevel, mounted modules, kernel configuration, and core dumps Check Run level RUNLEVEL 5

Install redis on Windows and use PHP

.# When the memory limit is reached Redis will try to remove keys with an# EXPIRE set. It will try to start freeing keys that are going to expire# in little time and preserve keys with a longer time to live.# Redis will also try to remove objects from free lists if possible.## If all this fails, Redis will start to reply with errors to commands# that will use more memory, like SET, LPUSH, and so on, and will continue# to reply to most read-only commands like GET.## WARNING: maxmemory can be a go

Convert a dictionary to its json string in python-Python tutorial

The Python dictionary and JSON are very similar in form. In fact, JSON is actually a string representation of the Python dictionary. However, as a complex object, the dictionary cannot be directly converted into a string defining its code, let's analyze it in detail # This is a dictionary in Python dic = { 'str': 'this is a string', 'list': [1, 2, 'a', 'b'], 'sub_dic': { 'sub_str': 'this is sub str', 'sub_list': [1, 2, 3] }, 'end': 'end' } // This is a JSON object in javascript. json_obj =

Traceroute and tcpdump commands

dumping after receiving the specified number of data packets. -D converts compiled data packet encoding into a readable format and dumps it to standard output. -Dd converts the compiled data packet encoding to the C language format and dumps it to the standard output. -Ddd converts the compiled data packet encoding to a decimal number format and dumps it to the

Linuxtcpdump packet capture parameters

Function description: dumping network transmission data. Syntax: tcpdump [-adeflnNOpqStvx] [-c] [-dd] [-ddd] [-F] [-I] [-r] [-s] [-tt] [-T] [-vv] [-w] [output data column] supplementary description: run the tcpdump command to list the packet headers that pass through the specified network. in Linux, you must be a system administrator. Parameter:-a function description: dumping network transmission data. Syntax: Tcpdump[-AdeflnNOpqStvx] [-c] [-dd] [-ddd] [-F] [-I] [-r] [-s] [-tt] [-T] [-vv] [-w

Redis configuration file redis.conf detailed description

command is also received, Redis will first attempt to remove the key that set the expire information, regardless of the key's expiration time has not arrived.#在删除时, it will be deleted by the expiration time and the first key to be expired will be deleted first. If the key with expire information is erased, an error is returned.#这样, Redis will no longer receive write requests and receive only get requests. MaxMemory settings are more appropriate for using Redis as a memcached-like cache.# maxmem

Fault diagnosability Infrastructure Overview

text string that describes the problem. It includes an error code (such as ORA) and in some cases, one or more error parameters. An incident are a single occurrence of a problem. When a problem (critical error) Occursmultiple times, an incident are created for each occurrence. Incidents is timestamped and tracked in the Automatic Diagnostic Repository (ADR). Each incident are identified by a numeric incident ID and which is unique within the ADR. When an incident occurs, the database makes a en

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