Generation Data Groups (GDGs) are group of datasets related to each other by a common name. The common name is referred as GDG base and each dataset associated with the base is called a GDG version. A Maximum of 255 generations are allowed for a GDG base. MYDATA.TEST.SAMPLE.GDG is the GDG base name.

2012年10月26日 · You should use (0) index to refer the lastest added dataset to the GDG. (+1) indicates that a new dataset should be added to the GDG. More information: IBM Retrieving a Generation Data Set

2015年11月29日 · What to tell correct answer in Interviews, if GDG (+2) is given in JCL: Suppose, you have given (+2) in JCL instead of (+1), then, it creates (+2) generation. So, it jumps the generation number to 2. Usually, it should be (+1). Since you have given as (+2), it creates (+2) generation after (0) generation. Ex: 1st> GDG.G0002V00 next>GDG.G0004V00

What is GDG? GDG stands for "Generation Data Group", a concept in the mainframe that allows organizing and managing datasets or files over the time. These are a group of datasets that are logically related (with the same attributes like format and record length) to each other from the process and usage point of view.

2012年1月15日 · The 'DISP FIELD INCOMPATIBLE WITH DSNAME' is due to the fact that there is already a (+1) in existance, and with a DISP=(NEW,CATLG) you are trying to create something that dfihnately already exists. I would be very interested to know in what context you consider it a requirement to create 2 or more generatoins of the same GDG base in the same job.

In the following examples, gdg (0), gdg (-1), and gdg (+1) specify which copy of the GDG you are using. 0 indicates the latest version, -1 indicates the previous version, and +1 indicates that a new version is created. GDGALL is not supported by the z/OS® FTP server. GDGALL processing occurs when the base name for the GDG is specified without ...

2005年3月8日 · step 3 ==> X.Y.Z (+1) is Referred and the job abended. then GDG X.Y.Z.G0001v00 will be created and if you try to access then an JCL ERROR will occur. The solution is you can Delete the Current version and Run the job from the beginning. hope this helps. I have 4 steps in my job. A GDG is being created in step2.

2013年8月28日 · Once the job step creating the (+1) generation data group (GDG) file has completed, the most recent GDG file is (+1). The current GDG does not become zero until after the job ends or abends. Here's an example from one of our batch jobs.

As the creation step is included in the same job so the version for the file that is deleted will be gdg(+1) and new file created will be gdg(+2). once the job execution is completed the generation for the new file created will become gdg(0)

11. jcl to delete all gdg generation(s) //racfid11 job 11,'ibmmainframer',class=a,msgclass=a,msglevel=(1,1),notify=&sysuid //***** //* jcl to delete a one gdg ...