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What does the keyword DCB mean and what are some of the keywords associated with it?
DCB stands for data control block; it is a keyword for the DD statement used to describe datasets. Keywords associated with it are BLKSIZE, DEN, LRECL and RECFM.


  
Total Answers and Comments: 1 Last Update: December 27, 2006   
  
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December 27, 2006 07:12:02   #1  
SANGRAMKC        

RE: What does the keyword DCB mean and what are some o...

DCB parameter is used to provide file characteristics to use in completing Data control Block(DCB) for a dataset

Syntax

1. DCB (subparameter subparameter ..)

2.DCB dsname

3.DCB *.DDname

4.DCB *.stepname.ddname

5.DCB *.stepname.procstepname.ddname

subparameter includes LRECL bytes RECFM (specifies format & characteristic of record can be of F V U etc) BLKSIZE bytes(should be in multiple of LRECL or less than it)


 
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 Related Questions

A keyword in a JCL statement may appear in different places and is recognized by its name, eg. MSGCLASS in the JOB statement. The opposite is positional words, where their meaning is based on their position 
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The JOB statement is the first in a JCL stream. Its format is // jobname, keyword JOB, accounting information in brackets and keywords, MSGCLASS, MSGLEVEL, NOTIFY, CLASS, etc.  
Latest Answer : Notify is misspelled in the answer. ...

The EXEC statement identifies the program to be executed via a PGM=program name keyword. Its format is //jobname EXEC PGM=program name. The PARM= keyword can be used to pass external values to the executing 
Latest Answer : EXEC statement refers to a PROGRAM or a PROCEDURE to be executed Syntax: //stepname    EXEC   PGM=pgm-name,parametersOR //stepname     EXEC    procedure-name,parametersParameters are1.Positional(pgm-name,procedure name) 2.Keyword (PARM,REGION,ACCT,COND,TIME) ...

The DD statement links the external dataset name (DSN) to the DDNAME coded within the executing program. It links the file names within the program code to the file names know to the MVS operating system. 
Latest Answer : DD statement is the DATA DEFINITION Statement.It's function is to give a symbolic name to a file. This will allow a program to access a file through this name so that the file name may be changed without effecting the program. There are several ...

RESTART is a JOB statement keyword. It is used to restart the job at a specified step rather than at the beginning.  
Latest Answer : Restart is a keyword which is used in mainframes to restart the perticular step in the job at not the begining ...

What are the keywords associated with DCB? How can you specify DCB information? What is the OS precedence for obtaining that DCB information, ie. where does the system look for it first?
The keywords associated with the DCB parameter are LRECL, RECFM, BLKSIZE and DSORG. The DCB information can be supplied in the DD statement. The sysem looks for DCB information in the program code first. 

COND specifies the conditions for executing the subsequent job step. The value after the COND= is compared to the return codes of the preceding steps and if the comparison is true, the step is bypassed. 
Latest Answer : In exec statement the condition is used for by-passing the perticular step through the condition,if COND=0 Its a successfull executionif COND=4 Its a warning if COND=8 Its a serious errorif COND=16 Its a fatal error.So that we can use this condition key ...

The value after the PARM= specifies control information to be passed to the executing program of the job step.  
Latest Answer : It is only used for to pass the values by JCL to the perticular application program like COBOL program. ...

REGION specifies the maximum CPU memory allocated for a particular job or job step. If REGION is in the JOB card, it relates to the entire job; if in the EXEC statement, it relates to the job step.  
Latest Answer : region is the keyword parameter used in job and exec statements annd it is for storage purpose region=2096128k default ...

TIME specifies the maximum CPU time allocated for a particular job or job step. If TIME is in the JOB card, it relates to the entire job; if in the EXEC statement, it relates to the job step.  
Latest Answer : if time parameter is coded on both job and step, then the time coded on the EXEC statement over-rides the one on the job.[refererred on pg 88 of Mvs Jcl Primer]U might be interested to know this too.The COND parameter if coded on both job and step, ...


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