How to store objects with redis

Redis uses the dynamic data structure "Redis Objects" to store data, including strings, hashes, lists, collections, and ordered collections. These objects are represented internally in RDB format and optimized using different encoding types according to data characteristics. The life cycle of a Redis object is affected by the creation, acquisition, modification, and deletion operations, and the expiration time (TTL) can be set to automatically delete the object after the TTL.

How Redis stores objects

Redis is a key-value-pair database that uses a method called Redis object to store data. Redis objects are dynamic data structures that can store various types of data, including strings, hashs, lists, collections, and ordered collections.

Storage data type

• String: Stores binary-safe strings.
• Hash: A mapped set that stores key-value pairs.
• List: Stores elements arranged in order.
• Collection: Stores a unique collection of elements.
• Ordered set: A collection of elements with fractions, sorted by fractions.

Internal representation of an object

Redis objects are internally represented using a binary format called RDB (Redis database). The RDB format provides compact data storage and can be loaded into memory quickly.

Object encoding

Redis uses a method called object encoding to optimize the storage of objects. The encoding type is determined by the characteristics of the data and affects the memory usage and access performance of the object.

• intset: Used to store small sets of integers.
• ziplist: used to store small lists and hashs.
• linkedlist: used to store large lists and hashs.
• hashtable: used to store key-value pair mappings.
• skiplist: used to store ordered collections.

The life cycle of an object

The life cycle of a Redis object is determined by the following operations:

• Create: When creating an object using SET or other commands.
• Get: When using GET or other commands to get the object.
• Modify: When modifying an object using INCR or other commands.
• Delete: When deleting an object using DEL or other commands.

Expiration of the object

The Redis object can set the expiration time (TTL), and after the TTL, the object will be automatically deleted.

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