Is there any number limitations of field for Redis command HMSET?

Question

What's the max number limitation of field for Redis command HMSET ? If I set 100000 fields to one key by HMSET , if would cause the performance issue comparing to use the each field as a key?

Answer 1

it is quite large, 2^64-1 in 64 bit systems, and 2^32 -1 in 32 bit systems, https://groups.google.com/d/msg/redis-db/eArHCH9kHKA/UFFRkp0iQ4UJ

1) Number of keys in every Redis database: 2^64-1 in 64 bit systems. 2^32-1 in 32 bit systems. 2) Number of hash fields in every hash: 2^64-1 in 64 bit systems. 2^32-1 in 32 bit systems.

Given that a 32 bit instance has at max 4GB of addressable space, the limit is unreachable. For 64 bit instances, given how big is 2^64-1, the limit is unreachable.

So for every practical point of view consider keys and hashes only limited by the amount of RAM you have.

Salvatore