On Sun, 6 Aug 2017 10:34:42 -0700, Sri h Kolusu <skol...@us.ibm.com> wrote:
>> Can somebody shed light on this issue - in simple terms please :) ? > >Theo, > >It would be best to avoid concatenation with referback due to the >potential problems caused by the system restriction described here in the >second bullet: > >https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.icem100/beaware.htm > >Be aware that, in some cases, if a DD statement specifies a data set for >output that is extended to a second or subsequent volume, and another DD >statement within the same step requests the same data set, only the >records on the first volume will be read, and incorrect output will >result. > >We always recommend to use one temp data set with disposition MOD . i.e > >//TEMP1 DD DSN=&&TEMP1,UNIT=SYSDA,DISP=(MOD >,PASS),SPACE=(CYL,(X,Y),RLSE) > >Copy your datasets into a single dataset with MOD disposition and you will >not run into the system restriction. > >I am guessing that you are using SPLICE operator to find the matching >records between 2 files IN1 and IN2. Please note that JOINKEYS is much >more efficient technique and it can even handle MANY to MANY match which >SPLICE operator cannot handle. > >Since I don't have your entire TOOLIN Cards I cannot rewrite your JCL. If >you can send your TOOLIN statements then I can optimize the job or convert >it to use JOINKEYS. > >Further if you have any questions please let me know > >>>>Since I do not know this tool you are using or what it will do, it >might be possible to use something like SORT to do what you want. > >Lizette, > >The Job is indeed using ICETOOL > > >Thanks, >Kolusu >DFSORT Development >IBM Corporation > You're right. Because the CONCAT DDs are referencing new TEMP1 and TEMP2 in the same step - they will not see any additional volume that TEMP1 and TEMP2 will overflow into. The updated volume information will not be available to the CONCAT DDs. Hence the S637-BC, which says "The last known volume for the data set could not be located while reading a multivolume DASD data set" for the CONCAT DD. This is stated in the JCL Ref. manual, discussing the VOL=REF=*.ddname parameter (same step). ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
