Recommend key size

[WeihanLi]

Is there some recommendation about the key size, for example,
how many entries max to should be used for the hash/list/set/zset/stream... considering the performance

[viktor111]

Highly dependent on project requirements. But if you expect large amount of entires consider partitioning your data into multiple keys. For example, instead of having one massive hash, you could shard the hash across multiple keys based on some part of the hash field

[sundb]

there is no standard answer.
this depends on the real scenaro (commands used, memory, etc.)
a good way is to refer to the time complexity in https://redis.io/commands.
.e.g for a hash of 1 million entries, HGET (O(1)) and HGETALL (O(N)) have completely different performance.