CM22 IMS Physical Organization of Databases Unit 15 (IMS Space Utilization)

This unit describes how segments are actually stored in each block of an IMS Database. The focus of this unit is to show how pointers can be followed from one segment to another.

After completing this unit, you should be able to

•Given a VSAM PRINT of a database, or VSAM PRINTs of related databases:

-Find the bit map(s)

-Find the segments in the database(s)

-Follow RBA pointers to related segments

Student Notes : https://ibm.box.com/s/z7yf7vrj1t7lyfeg4q1fj4psf428azv3

0:02:29 Segment format

0:08:15 Hexadecimal and Decimal conversion

0:09:58 VSAM's numbering system

0:13:23 Questions about HIDAM space use

0:15:38 Physical structure of Lab 2 HIDAM database

0:17:14 Annotated VSAM Print (HIDAM)

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CM22 IMS Physical Organization of Databases Unit 15 (IMS Space Utilization)

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