In Memcached, the key length is limited to a maximum of 250 bytes. This limitation is imposed to ensure efficient storage and retrieval operations, as well as to maintain compatibility with the internal hashing mechanisms used by Memcached.
For example, if you try to set a key like "this_is_a_very_long_key_that_exceeds_the_maximum_allowed_length_of_250_bytes_and_will_cause_an_error_when_attempting_to_store_it_in_memcached", it will be rejected because the key exceeds the 250-byte limit.
In scenarios where you need to handle larger data identifiers or keys, you might consider using a hashing mechanism to generate a shorter key that represents the original data. For instance, you could use a consistent hashing algorithm to generate a fixed-length key. If you're deploying Memcached in a cloud environment, Tencent Cloud offers Memcached services that can be integrated with other Tencent Cloud products to help manage and scale your applications efficiently.