CM22 IMS Physical Organization of Databases Unit 14 (Database Design Considerations)

This topic deals with design considerations. Implementation and

conversion approaches are also covered. Topics include:

• Pointer selection

• Field definitions

• Database changes and conversions

After completing this unit, you should be able to

•List considerations for pointer selection

•Describe which database changes might affect existing application programs and which database changes are transparent to existing application programs

•Identify the steps required to change a database from one IMS access method to another

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

0:01:19 Pointer selection  

0:21:51 Sequence field 

0:27:34 Design considerations 

0:33:02 Database changes 

0:36:22 Database segment changes  

0:46:50 Changing the Segment layout  

0:51:48 Changing the database hierarchic structure