1.1. Install MongoDB
1.2 create folder
2. Build a replica set
2.1. Build the replica set of configserver.
2.2. Build the replica set of share service
3. Build a fragment set
The environmen ...
Posted on Sat, 18 Jan 2020 03:50:25 -0500 by haixiao
In the distributed scheduling, in order to ensure the high availability and disaster recovery requirements of the service, it is usually said that the service is evenly distributed in multiple areas, racks and nodes, so as to avoid the service unavailability caused by a single point of failure. The algorithm, SelectorSpread, is naturally implem ...
Posted on Sat, 18 Jan 2020 02:05:50 -0500 by d~l
Improvement of decision tree algorithm integrated learning
1. Definition of integrated learning
Using the combination of several weak learning methods (ID3 algorithm, C4.5 algorithm, CART algorithm), we make multiple classification models, that is, multiple decision trees (analog multi expert votin ...
Posted on Fri, 17 Jan 2020 09:42:45 -0500 by johnc71
Learning objectives: master the following sql functions
Digital function: format ABS mod ceil floor ground expCharacter function: upper lower char > length concat instrDate function: now date? Format date? Add DateDiff if ifnullConditional function:
First batch of digital functi ...
Posted on Fri, 17 Jan 2020 09:10:21 -0500 by DKY
Centos7 uses Yum source to install mongodb version 4.2 database
1. Modify the support of yum installation source for mongodb
Official documents available:
This month is also built with reference to official documents
Posted on Fri, 17 Jan 2020 08:08:48 -0500 by p0pb0b
In GOF's book "design patterns: the foundation of reusable object-oriented software", the strategic patterns are as follows: define a series of algorithms, encapsulate them one by one, and make them interchangeable. This pattern allows the algorithm to change independently of ...
Posted on Fri, 17 Jan 2020 04:24:37 -0500 by amelhedi
Application of Web Storage
Web Storge enables applications to save program data on the client while the client is running, turning the browser into a real "program running environment" instead of a simple "interface rendering tool"
Storage interface: Session Storag ...
Posted on Thu, 16 Jan 2020 21:54:36 -0500 by jc_ply
Open API is open API, also known as open platform. The so-called open API (OpenAPI) is a common application of service-oriented websites. Website service providers encapsulate their own website services into a series of services
API (Application Programming Interface) is open for the use of third-party developers. Thi ...
Posted on Thu, 16 Jan 2020 12:38:05 -0500 by omidh
Modify data record
Q object - Q()
Native database operation method
The query of database needs to use manager object
Call the query interface through the MyModel.ob ...
Posted on Thu, 16 Jan 2020 10:21:54 -0500 by scotchegg78
The abbreviation of Redis(Remote Dictionary Server) remote dictionary data service, which is provided by ItalyWhat we developed is a memory cache database. It is written in ANSI C language, supports network, and can be based onIt can also store log and key value databases that can be persisted, and provide API s in multiple ...
Posted on Thu, 16 Jan 2020 10:02:55 -0500 by thebay