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tramasamy · Beginner Joined: 17 Dec 2002 Posts: 12 Topics: 8

Hi,

I would like to know the diff between DEDB and HALDB in IMS ?

Also I assume that Full function database can't be split across areas ??..

Thanks in advance
Rams

vkphani · Intermediate Joined: 05 Sep 2003 Posts: 483 Topics: 48

DEDB = Data Entry Data Base

A type of IMS fast path database designed to contain large volumes of data with a high rate of availability. Long chains of segment occurrences are managed using subset pointers. One segment type is stored near the root segment and the occurrences are kept in chronological order.

http://www.mvsforums.com/helpboards/viewtopic.php?t=1387&highlight=dedb

ANIL SARATHY · Posted: Tue Nov 08, 2005 4:15 am Post subject:

DEDB and HALDB support huge storage capacity. As the storage cost has come down , these structures came into existence.

DEDB:
It consists of one or more areas. Area can have segments from root to lowest level. Each area is dataset. It supports Online.

HALDB
It consists of one or more partitions. Partition can have segments from root to lowest level. All or some partition can be given access to onlines or offline. It gives this flexibility. programs can parallel process the database.

PHIDAM,PHDAM are HALDB.

HALDB definition ie DBD is little different from coventional DBD coding.
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Anil Sarathy