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In the last article, we discussed the performance of the log and the advantages and disadvantages of the log. A friend said that I didn't have any dry goods, so I decided to have a dry ...
Posted on Thu, 16 Jan 2020 08:30:01 -0500 by strangermaster
MySQL is a kind of relational database, which has strong query function, high data consistency, high data security and supports secondary index. However, the performance is slightly inferior to that of non relational databases, especially for data above one million levels, which is easy to cause slow query. At this time, we need to ana ...
Posted on Thu, 16 Jan 2020 02:02:29 -0500 by nuying117
Model & Form & model form
1, Model & Form & modelform
Model: used for user request data validation (weak pertinence), but with strong database operation
Form: powerful data validation (for user request data)
Model form: powerful data validation, moderate database operation. For data ...
Posted on Thu, 16 Jan 2020 01:34:29 -0500 by 3.grosz
What is mysql's master-slave replication?
MySQL master-slave replication refers to the replication of data from one MySQL database server master node to one or more slave nodes.MySQL replicates asynchronously by default, so that the master server is not always accessed by the slave node to update its own data, which can be updated over a remote ...
Posted on Wed, 15 Jan 2020 20:55:58 -0500 by Cinquecento
Redis built in data type
redis application scenario
Redis string common operations
Redis list common operations
This machine connects to the redis Library of another host
python and redis
NoSQL(NoSQL = Not Only SQL), whic ...
Posted on Wed, 15 Jan 2020 07:41:01 -0500 by binto
What is kafka
Kafka official website's own introduction is: a distributed flow platform can be supported.kafka official website
kafka has three key capabilities:
1. Publish / subscribe record flow, similar to message queue and enterprise information system
2. Store the record stream in a fault-tolerant and persistent way
3. Con ...
Posted on Wed, 15 Jan 2020 07:25:05 -0500 by xydra
4, Mapper layer
5, Test code
Query the detailed information of a user. In addition to the basic information of the user, it also includes the user's department and the user's role
Users and departments:
Posted on Wed, 15 Jan 2020 04:53:50 -0500 by phpdragon
Author: Du Kaisheng
1, Connection related
2, Long affairs
3, Metadata lock
4, Lock wait
5, Global read lock
6, Memory usage monitoring
7, Partition table
8, Database information overview
9, Tables not updated for a long time
10, Primary key, index
11, Storage engine
12, Real time load
1) This article involves a lar ...
Posted on Wed, 15 Jan 2020 04:10:52 -0500 by johnsonzhang
A content that represents a table type
Lesson 4: jupyter21:22
Session 5: pandas 24:31
Session 6: series 38:19
Lesson 7: data framework 25:50
# Load pandas Library
import pandas as pd
import numpy as np
s = pd.Series([2,4,6,8,10])
d = p ...
Posted on Wed, 15 Jan 2020 01:33:57 -0500 by mtb211
Because the MySQL 5.7.28 multiple instances installed using the source code will have problems when importing the database, the method of using mysql_multi to manage multiple instances will be studied again. After the verification of the test environment, the problem of MySQL 5.7.28 multiple instances has not been reported in all aspects of us ...
Posted on Tue, 14 Jan 2020 21:19:22 -0500 by Anant