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常见JCL面试问题

常见JCL面试问题

The following are the most Frequently Asked Questions (FAQS) :

Q1) What is a Generation Data Group (GDG)?

A1) Generation Data Group is a group of chronologically or functionally related datasets. GDGs are processed periodically, often by adding a new generation, retaining previous generations, and sometimes discarding the oldest

generation.

什么是GDG?

GDG是一组按世代或功能划分的数据集。GDG按世代处理,加一个新的一代数据要受上一代的限制,有时会丢换最老的一代。

Q2) How is a GDG base created?

A2) A GDG base is created in the system catalog and keeps track of the generation numbers used for datasets in the group. IDCAMS utility is used to define the GDG base.

GDG BASE 怎么样创建?GDG BASE在系统编目时被创建并且在GDG中保留用于DATASET中的世代个数的空间。使用IDCAMS定义GDG BASE。

Q3) What is model dataset label(Model DSCB)?

A3) A model dataset label is a pattern for the dataset label created for any dataset named as a part of the GDG group. The system needs an existing dataset to serve as a model to supply the DCB parameters for the generation data

group one wishes to create. The model dataset label must be cataloged. The model DSCB name is placed on the DCB parameter on the DD statement that

creates the generation data group.

什么是MODEL DSCB?MODEL DSCB是为GDG里的部分DATASET名创定标签。系统需要一个存在的DATASET做为一个模型向你想创建的GDG提供DCB参数。该模型DATASET标签必须被编目,

MODEL DSCB名放在创建GDG的DD语句中的DCB参数中。

Q4) How are GDGs concatenated?

A4) Generation Data Groups are concatenated by specifying each dataset name and the generation number for all generations of the generation data group.

Otherwise to have all generations of a generation data
group, omit the

Otherwise to have all generations of a generation data group, omit the

generation number. The DD statement will refer to all generations. The result is the same as if all individual datasets were concatenated. If generations are not on the same volume, this will not work.

GDG怎么样级联?GDG级联既可以指定每一个DATASET名,也可以指定GDG里的世代个数。另外,级联GDG里的所有世代可以省略世代个数。DD语句将涉及到所有的世代。结果和一个一个的级联一样。

如果世代不在同一个卷上该命令将不起作用。

Q5) How is a new GDG coded?

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