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Tag: foundation

Character encoding review and file basis (2)

1. Character encoding
Correspondence table of characters and numbers
ASCII: can recognize English characters, 1Byte=1 English characters
hello
8bit|8bit|8bit|8bit| 8bit

GBK:汉字与英文字符,2Byte=1中文

October 15, 2021By Simo Character character, code, file, foundation, review, twoLeave a Comment

[Data Structure] Basic Knowledge of Binary Tree

Total number of branches = number of summary points-1

Number of leaf nodes = number of double branch nodes + 1

Preface Traversal: Root left and right

Mid-order traversal: left roo

October 15, 2021By Simo Data Structure binary tree, Data Structure, foundation, KnowledgeLeave a Comment

CentOS foundation configuration

1. User switching command. The current ordinary user logs in. If you want to switch to the root user, you need to enter the command # su; if you want to switch from the root user to the ordinary us

October 14, 2021By Simo Centos centos, configuration, foundationLeave a Comment

ZooKeeper foundation

1. The origin of zookeeper

Zookeeper originated from a research group in Yahoo Research Institute. At that time, researchers discovered that many large systems within Yahoo basically depend o

October 14, 2021By Simo ZooKeeper foundation, ZookeeperLeave a Comment

ZooKeeper Basic Mechanism Principle

Znode:

1. Znode is both a path (directory) and information (file)

2, Znode has two categories: One is divided into temporary nodes (session life cycle) and permanent nodes; two are divi

October 14, 2021By Simo ZooKeeper foundation, Mechanism, principle, use, ZookeeperLeave a Comment

Hive Basics

hadoop hive 1) Hive was born in 2007,

2) 2014 hive 0.13.0 is very popular (it is relatively stable for the first time)

3) 2015hive1.2.0 (relatively only an upgrade)

4) 2016hive2.1

October 12, 2021By Simo Hadoop foundation, hive, KnowledgeLeave a Comment

Hive Basics 1

hadoop hive (emphasis) day-6

1) Hive metadata (similar to tables, column lengths, etc.) storage On mysql

1)create table table_name like old_table //only table

2)create table table

October 12, 2021By Simo Hadoop foundation, hive, KnowledgeLeave a Comment

SWIFT Basic Syntax – Data Type

Common Swift data types value type enum Optional structure (Struct) Bool, Int, Float, Double, Character String, Array, Dictionary, Set reference type class class

Sw The use of ift’s

October 10, 2021By Simo Swift data, foundation, SWIFT, Syntax, typeLeave a Comment

Article 1: Foundation

%

#与

|

#OR

not

#非

#Rounding
7 // 4

#求余
10% 4

#power
2 ** 3

#A place to pay attention to floating-point operations
a = 4.2
b = 2.1
c = a + b  #

October 10, 2021By Simo Rom articles, foundation, In the firstLeave a Comment

Will you have a comprehensive configuration of Huawei?

1. Experimental topology:

650) this.width=650;” src =”/wp-content/uploadshttp:/img.voidcn.com/vcimg/static/loading.png” title=”Picture1.png” alt=”wKiom1Z9EbqRF5tvAABKkDMH0Ok635.png” d=”475462

October 9, 2021By Simo Hybrid configuration, foundation, Huawei, Synthesis, willLeave a Comment

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