gtpd3m0nLibrary Guide with Master Index and Glossary

K

key
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.

keyword
A reserved C language word.