All 7 Redis Modules Overview questions
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What are Redis modules, and how do they extend Redis's core capabilities? What are some of the most widely used official Redis modules, and what specific capability does each one add? What is Redis Stack, and how does it relate to the individual Redis modules? What licensing considerations should you be aware of when using Redis modules in a commercial product? How would you evaluate whether to use a Redis module for a specific feature versus implementing similar functionality using Redis's core data types directly? How do Redis modules interact with Redis Cluster, and what considerations apply when using modules in a sharded, distributed environment?
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How do you check which modules are currently loaded on a running Redis instance, and how do you load a new module?

Intermediate

Answer

You use the MODULE LIST command to see all currently loaded modules along with their versions, and load a new module either by specifying it as a startup parameter when launching the Redis server, or dynamically at runtime using the MODULE LOAD command followed by the path to the module's compiled file.
MODULE LIST
MODULE LOAD /usr/lib/redis/modules/rejson.so
Real-world example A database administrator checks MODULE LIST to confirm the RedisJSON module is properly loaded before deploying an application that depends on its specific JSON commands.

Common follow-ups: What happens if your application tries to use a module command before that module is actually loaded?;Can modules be unloaded without restarting the Redis server?

Redis CLI & Basic Commands;RedisJSON
All 7 Redis Modules Overview questions