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This article mainly introduces what is the difference between redis and mongodb. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

Redis

Redis is an open source API that is written in ANSI C language, supports the network, can be memory-based and persistent, and provides API in multiple languages.

Redis is a key-value storage system. Similar to Memcached, it supports relatively more value types, including string (string), list (linked list), set (collection), zset (sorted set-ordered collection), and hash (hash type).

These data types support push/pop, add/remove, and take intersection union and difference sets, and richer operations, and these operations are atomic. On this basis, redis supports a variety of different sorting methods. Like memcached, data is cached in memory for efficiency. The difference is that redis will periodically write updated data to disk or modify operations to additional record files, and on this basis to achieve master-slave (master-slave) synchronization.

MongoDB

MongoDB is a documented database. First explain the database of the document, that is, you can store the data of the xml, json, and bson types.

These data are self-reporting (self-describing), showing a hierarchical tree data structure. Redis can use hash to store simple relational data.

MongoDB stores data in json format.

Suitable for scenarios: event logging, content management, or blog platforms, such as comment systems.

Difference

The size of memory space and the amount of data

Redis adds its own VM feature after version 2.0, which breaks through the limitation of physical memory; you can set the expiration time of key value (similar to memcache)

MongoDB is suitable for large amount of data storage, relying on the operating system VM for memory management, eating memory is also relatively strong, services should not be together with other services.

Data consistency (transaction support)

Redis transaction support is relatively weak, so it can only guarantee the continuous execution of each operation in the transaction.

MongoDB does not support transactions

Application scenario

Redis: more performance operations and operations with small amounts of data

MongoDB: mainly solve the problem of access efficiency of massive data

These are all the contents of the difference between redis and mongodb. Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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