Tag:data base

  • Using OLAP + OLTP to separate the architecture of database on cloud

    Time:2020-4-1

    Scene description Hybrid HTAP database requirements: for example, Oracle database transformation on cloud, cloud database scheme selection; OLTP system query is slow, there are analytical scenarios and bottleneck customers!. Solve the problem Real time complex query: improve the performance of analysis query and reduce the synchronization delay of online business data Aggregate polardb and ADB […]

  • Mongoose link database, add, delete, modify and check

    Time:2020-4-1

    According to personal coding habits, for reference only If you see something in a circle halfway, you can go to the official website to check it Import module var mongoose = require(“mongoose”); Connect to database mongoose.connect(“mongodb://localhost/mongoose_test”); Link state mongoose.connection.once(“open”,function () { Console.log (“database link succeeded”); }); Make a callback to see if the link is […]

  • Getting started with databases

    Time:2020-4-1

    Knowledge points △ reasons for using database 1 complexity of file operation2 synchronization3 concurrent processing4 safety △ database system (DBS)Database (DB) + database management system (DBS) + database application + Database Administrator (BDA) + end user △ database management system dBmNetwork application serverWe are going to use data from the server – we need to […]

  • Deep understanding of various contexts in Android

    Time:2020-4-1

    Preface There are many articles about Context on the Internet, such as: Android context fully parses, all kinds of details of context you don’t know What is Android context? But after a look, we found that there are still some points worth discussing, such as the equation: Number of contexts = number of services + […]

  • Choerodon from v0.20 to v0.21

    Time:2020-4-1

    ChoerodonPig toothed fish open source cloud technology platformIt is based on the open-source technology kubernetes, istio, knowledgeable, gitlab, spring cloud to realize the integration of local and cloud environment and the consistency of enterprise multi cloud / hybrid cloud application environment. By providing lean agile, continuous delivery, container environment, micro services, Devops and other capabilities, […]

  • The process of installing Oracle 11gr2 server (single instance) on personal virtual machine (centos7)

    Time:2020-3-31

    Preface Because it is installed on a personal virtual machine and can be connected to the public network, and what is actually used through VMware is your CD-ROM image, so the local Yum source can be installed directly using Yum without configuration. Operating system installation 1、 Download and install VMware, prepare centos7 image ISOThere is […]

  • “@ read and burn” is online!

    Time:2020-3-31

    I found an interesting website a while ago. It can let your text be destroyed after displaying once. Until I sent the website to a friend, the website couldn’t be opened, so I wanted to develop one. The front-end uses the bootstrap framework, and the back-end is written in PHP. There is no background, and […]

  • Install & configure PostgreSQL 12 on CentOS 7

    Time:2020-3-31

    I. Preface 1. Main content of this paper PostgreSQL 12 installation (Yum) PostgreSQL 12 basic configuration PostgreSQL 12 remote access configuration PostgreSQL basic management 2. Environmental information and scope of application environmental information Software Edition CentOS 7.6 Release PostgreSQL 12.x Scope of application Software Edition CentOS CentOS 7.x PostgreSQL 9.x-12.x 2、 PostgreSQL installation 1. Import […]

  • Opentsdb optimization technology of decryption cloud HBase timing engine

    Time:2020-3-30

    Time flies, day and night. — Confucius Time is like running water. Once gone, it will never return. Since ancient times, there have been many regrets about the passage of time, while modern technology has recorded the passing of the past. We can take photos, video, of course, we can also use time series database! […]

  • Microservice configuration center: Spring + mybatis + Druid + Nacos

    Time:2020-3-30

    In discussing service discovery and configuration with scenarios, we describe three typical application scenarios of Nacos configuration center, including how to use Nacos configuration center to control database connection information in spring boot, and how to use Nacos configuration center in “native” spring? In many web development based on spring MVC framework, spring + mybatis […]

  • MySQL Cluster highly available

    Time:2020-3-30

    Catalog MySQL highly available Galera cluster Galera Cluster Galera cluster features Disadvantages of Galera cluster Galera cluster working process Official document of Galera cluster Galera cluster consists of two components Wsrep replication implementation PXC principle PXC most commonly uses the following four port numbers: Important concepts and core parameters involved in PXC: Practical case: percona […]