Use the default TTL value specified in policy for a given command type.
Use the default TTL value for the namespace of the record.
Update the record without changing the record's TTL value. Requires server 3.10.1 or later.
Never expire the record.
Enumeration of special TTL (time-to-live) values.
Instead of specifying a TTL in seconds, you can set the TTL to one of these special values when creating or updating a record.