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Test basis: Redis of Nosql database

2022-07-29 19:41:00 【Rejoice in the testing world】

Redis stands for Remote Dictionary Server, which is a key-value non-relational (NoSQL) database based on memory.

Compared to other in-memory databases, Redis has the following characteristics:

Redis can not only store data completely in memory, but also realize persistent storage of data through disk;

Redis supports rich data types, including string, list, set, zset, hash and other data types, so it is also called "data structure server";

Redis supports master-slave synchronization, that is, master-slave master-slave replication mode.Data can be synchronized from the master server to any number of slave servers, effectively ensuring data security;

Redis supports multiple programming languages, including C, C++, Python, Java, PHP, Ruby, Lua, and more.

Different from SQL-type databases, Redis does not provide the operation of creating a new database, because it comes with 16 (0-15) databases (the default database is 0).In the same library, the key is the only one that exists and cannot be repeated. It is like a "key" and can only open a "lock".The essence of key-value storage is to use the key to identify the value. When you want to retrieve the value, you must use the key corresponding to the value to search.

Redis database does not have the concept of "table". It uses different data types to meet the needs of storing data. Different data types can adapt to different application scenarios to meet the needs of developers.

A brief summary of the advantages of Redis:

High performance: Redis implements data storage based on memory, its read speed is 110,000 times/s, and its write speed is 81,000 times/s;

Multi-purpose tool: Redis has many uses, such as caching, message queues, building Redis clusters, etc.;

Command prompt function: The Redis client has a powerful command prompt function, which is very convenient to use and reduces the learning threshold;

Portability: Redis is written in standard C and can run on most operating systems, such as Linux, Mac, Solaris, etc.

Redis vs. other databases:

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