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Most people do not understand the knowledge points of this article "how to master Redis knowledge points", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to master Redis knowledge points" article.

Distributed cache service DCS

Compatible with two in-memory database engines, providing ready-to-use / convenient management of online distributed caching capabilities.

The distributed cache stand-alone instance supports high read and write concurrency without persistence, and the original data is saved when the instance is restarted.

Cache service system policy

Read and write permissions

Administrative authority: the administrator right of the distributed cache service, and the user with this permission can operate the functions of all distributed cache services.

User permissions: general user rights for distributed cache service (no permission for instance creation, modification, deletion, expansion or reduction).

Read-only permission for the distributed cache service, and users with this permission can only view distributed cache service data.

The administrator right of the distributed cache service, and the user with this permission can operate all the functions of the distributed cache service.

Stable status of elastic CVM

Failure of shutdown in operation

VPC belongs to network service.

Network ACL / NAT Gateway / Security Group controls the ECS in the VPC to connect to the public network

ECS Ion isolation Network ACL Security Group in VPC

The cloud database provides the storage location for the network disk files and the

1. Weighted polling algorithm

Distribute requests to different servers sequentially according to the weight of the back-end server

two。 Minimum connection algorithm

3. Source IP address algorithm

Huawei Cloud Relational Database (Relational Database Service, referred to as RDS) is an online relational database service based on cloud computing platform, which is ready-to-use, stable, reliable, flexible and convenient to manage. Relational databases support the following engines:

MySQL

PostgreSQL

SQL Server

GaussDB T

Use relational databases in two ways.

Administrative console: you can use the Web interface provided by the administrative console to complete the related operations of the relational database.

API: you can write code to call API to use a relational database. Please refer to the "Relational Database API reference".

Working with scen

KC1 elastic CVM is suitable for government-enterprise financial scenarios with high requirements for independent research and development, security and privacy, Internet scenarios with high network performance requirements, big data and HPC scenarios with high audit requirements, and cost-sensitive scenarios such as building stations and e-commerce.

What is the reason for the failure of Redis migration?

1. During data migration, if the Redis instance is switched between master and slave, the migration may fail. You can contact technical support to turn off the master / slave switch, and then enable the master / slave switch after the migration is successful.

two。 If you are migrating online, make sure that the source Redis instance has disabled SYNC and PSYNC commands. If so, you need to enable it first to allow data synchronization.

3. If you are migrating a standalone / master / slave instance to a Proxy cluster instance, make sure that there is data in the DB other than the stand-alone / master / slave instance DB0. If so, save the data to DB0 first, otherwise the migration will fail.

Proxy clusters do not support multiple DB, only one DB0.

Database instance storage type

Database system is usually the most important system in IT system, which requires high storage IO performance. You can choose the storage type you need according to your needs. RDS does not support changing the storage type after creating an instance.

Table 1 introduction to storage types

Before reinstalling / switching systems on elastic CVM ECS, please shut down the CVM first.

CVM backup CSBS online backup without shutting down the computer.

Compared with open source redis DCS Redis, the service has the advantages of short build time, high security and reliability.

Monitoring operation and maintenance: easy operation and maintenance, expandability, visualization

Status description of elastic CVM

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