System-Attributes Reference

The platform defines the following object (item) system attributes. For more information, see the description of system attributes in the Attribute Types documentation.

Note
The names of the predefined system attributes are reserved names in the platform. For more information, see Reserved Names.
Attribute Description
__name Object name, which uniquely identifies the object within a collection and serves as the value of the object’s primary key. See Object Names and Primary Keys.
__size Object size.
__mode Object access control list (ACL).
__atime_secs Access time in seconds, as a Unix timestamp.
__atime_nsecs Nano-seconds resolution for the __atime_secs access time.
__mtime_secs Last modification time in seconds, as a Unix timestamp.
__mtime_nsecs Nano-seconds resolution for the __mtime_secs last modification time.
__ctime_secs Creation time in seconds, as a Unix timestamp.
__ctime_nsecs Nano-seconds resolution for the __ctime_nsecs creation time.
__uid Unique identifier (UID) of the object owner.
__gid Group identifier (GID) of the object owner’s group.
__obj_type Object type.
__collection_id Parent-collection ID. A collection can be a stream, a table, or a directory.
__last_sequence_num The sequence number of the last record in stream shard; applicable only to stream-shard objects.