CM22 IMS Physical Organization of Databases Unit 6 (HD Access Methods)

This unit provides an overview of IMS HD physical organization.

Features covered include:

• HD organization

• HD pointers

After completing this unit, you should be able to

•Describe HD (Hierarchical Direct) database characteristics, pointers, database storage format, space management, freespace, and data sets

0:01:59 Common HD (Hierarchical Direct) characteristics

0:15:40 HD organization: Pointers

0:27:17 Hierarchic pointer specification

0:37:55 Physical twin pointer specification

0:52:35 Physical child pointer specification

1:04:28 HD database format

1:13:32 Management of free space

1:17:45 HD Space Search algorithm

1:52:55 Multiple Data Set Groups

2:00:52 Movement of variable length or compressed segments

2:05:24 HD data sets and free space

Related Media