In persistent collections, a key is an
identifier that helps to organize and access elements in a collection.
key bag collection
A type of collection with
unordered, nonunique elements that are accessible by a nonunique key.
key-controlled protection
When
key-controlled protection applies to a storage access, a user may store
information into a location only when the storage key matches the access key
associated with the request for storage. A user may fetch information
only when the keys match or when the fetch-protection bit of the storage key
is zero.
keyed log collection
A type of collection
with ordered, nonunique elements that are accessible by a nonunique
key. Elements are ordered by arrival sequence. The collection
cannot be expanded and the elements will wrap when the collection becomes
full; that is, the newest element will replace the oldest element in the
collection.
key path
A structure that allows a
particular element to be quickly accessed by a field value, and allows
sequential access to elements, by a field, when iterating through a
collection.
key path field
A field specified by the
displacement to, and length of, contiguous bytes within the data elements of a
collection that will be used as a key for an alternate key path.
keypoint
A critical control program record,
or field in a record, with a backup on DASD. To update the DASD copy of
a keypoint record.
keypointable
The attribute of any data field
or data record that can change dynamically during online operations.
Therefore, the data must be saved; that is, keypointed in the event of
system outage.
keypoint backup area
An image-shared area
used to save a copy of the working area when keypoints are moved from the
staging area to the working area.
keypoint staging area
An image-unique area
used to preload keypoints. The contents of this area can be moved into
the working area of keypoints prior to an IPL.
keypoint working area
An image-shared area
that contains the working copy of all of the keypoints.
key record
A pool record that is arranged in
a tree-like structure by which TPF collection support (TPFCS) sorts the keys
and locates the data record containing the data element that corresponds to
each key. Synonymous with index record.
key set collection
A type of collection with
unordered, nonunique elements that are accessible by a unique key.
key sorted bag collection
A type of
collection with elements with nonunique keys. The keys are sorted in
ascending binary order.
key sorted set collection
A type of
collection (also known as dictionary) with ordered elements that are
accessible by a unique key. The element values are nonunique.
Elements are ordered in ascending sequence by the key.