Random search in file

dipanshu · New User Joined: 16 Jan 2006 Posts: 53 Location: pune

Hi All,

Can we search a file in random mode on the basis of Partial key.

Say the key length in Vsam file is of 40
and I only want to search for the last 10 characters of the key

ie move '0123456789' to key(31:10)
read <file1>

It it possible

Thanks,
Dipanshu

DavidatK · Posted: Sun Apr 23, 2006 6:38 am

Dipanshu.

I believe the only way to do that is to define a secondary key for that location.

Dave

shivani_tech · Posted: Sun Apr 23, 2006 1:31 pm

ya only with the help of alternate key...........we can solve out this.

dipanshu · New User Joined: 16 Jan 2006 Posts: 53 Location: pune

Hi shivani,

Many thanks 4 reply,

Could u or anyone please elaborate the above reply.

Thanks Dipanshu

sreenivas_kommana · New User Joined: 11 Apr 2006 Posts: 1

alternate key on vsam is Alternate Index.
Define AIX on your VSAM file. Find below the format:

EXAMPLE.AIX - your alternate index
EXAMPLE.KSDS2 - your base VSAM file

//DEFAIX1 JOB ...
//STEP1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=A
//SYSIN DD *
DEFINE ALTERNATEINDEX -
(NAME(EXAMPLE.AIX) -
RELATE(EXAMPLE.KSDS2) -
MASTERPW(AIXMRPW) -
UPDATEPW(AIXUPPW) -
KEYS(3 0) -
RECORDSIZE(40 50) -
VOLUMES(VSER01) -
CYLINDERS(3 1) -
NONUNIQUEKEY -
UPGRADE) -
CATALOG(USERRCAT/USERUPPW)
/*

NOTE: You can refer the below link for more help.
publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/dgt1v403/CCONTENTS

-kommana