Answer / rama krishna

DBDGEN means Database Descriptor Generator which is used to
define the IMS database. While declaring the DBD, we are
going to declare all the segments and the parent and child
relationship among them and the fields in each segment and
their properties.

Answer / nygrande

DBDGEN control statements consists of Assembler Language
macro statements. The macros are supplied by IBM in a
library named IMSVS.MACLIB. DBDGEN control statements are
normally coded by the DBA and submitted to the system with
JCL. That invokes a cataloged procedure usually called
DBDGEN. The DBDGEN procedure causes the DBDGEN control
statements to the processed by the assembler producing the
object module. The object module is then passed to the
linkage editor which, in turn, stores a load module in
another IMS Library called as IMS.DBDLIB or IMSVS.DBDLIB.

The DBD process is normally preformed only once for a
database. All applications use the DBD in accessing the
information on the database. A new DBD is normally created
only if the physical nature of the database changes.

Answer / techy

Sameple Data Base Descriptor Generator :

PRINT NOGEN
DBD NAME=VENDOR,ACCESS=HDAM
DATASET DD1=VEND,DEVICE=3380
SEGM NAME=VENSEG,PARENT=0,BYTES=10
FIELD NAME=(VENCODE,SEQ,U),BYTES=10,START=1,TYPE=C
SEGM NAME=ITEMSEG,PARENT=VENSEG,BYTES=5
FIELD NAME=(ITEMCODE,SEQ,U),BYTES=5,START=1,TYPE=C
SEGM NAME=LOCNSEG,PARENT=ITEMSEG,BYTES=9
FIELD NAME=(LOCNCODE,SEQ),BYTES=3,START=1,TYPE=C
FIELD NAME=ORDDATE,BYTES=6,START=4,TYPE=C
DBDGEN
FINISH
END

Answer / deepak

Key field - used to uniquely identify the records in the
segment

I am totally confused on IMS message segments. When I create a message and it contains 5 segments does the entire message have a 32k limit or does each segment have a 32k limit? Is there a setting in the stage1 sys gen that defines if a transaction can receive/send multi-segmented messages?

1 Answers  

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Is it necessary that all the segments in a Dl/i database have key fields ?

2 Answers  

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which is the first statement in COBOL-IMS programs?

2 Answers   Ford, IBM,

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What are the path calls in imsdb?

2 Answers  

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What is IMS?

2 Answers  

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How to write the PCB code ? if in thic PCB i have 3 PSB ?

4 Answers  

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What is Program Isolation?

1 Answers  

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What is the return code you get after a successful IMS call?

4 Answers  

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How do you write a PSB code ?

3 Answers  

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What is the difference between SIBLINGS and TWINS in IMS-DB database

2 Answers   IBM,

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What are the parameters used in CBLTDLI call?

2 Answers   CSC,

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What is the maximum number of fields allowed per segment and what is the maximum number of fields per database?

0 Answers  

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