Enumeration key

Send the digest value of the key. This is the recommended mode of operation. This calculates the digest and sends the digest to the server. The digest is only calculated on the client, and not the server.

Send the key, in addition to the digest value. If you want keys to be returned when scanning or querying, the keys must be stored on the server. This policy causes a write operation to store the key. Once the key is stored, the server will keep it - there is no need to use this policy on subsequent updates of the record. If this policy is used on read or delete commands, or on subsequent updates of a record with a stored key, the key sent will be compared with the key stored on the server. A mismatch will cause ERR_RECORD_KEY_MISMATCH to be returned.