How do redis store data

Question

If redis stores data as key value pair in memory, what is the size of hash table redis creates initially to store key-value pairs? Do it create a table of size equivalent to maxmemory parameter in config file?

Answer 1

No, the size of the hash table of the main dictionary is dynamic.

The initial size is 4 entries. Then it grows to accommodate the data, following powers of 2. Growing is dynamic, so rehashing is incrementally performed in background. Expensive rehashing operations can not block a simple set command.