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Jcl New (4) [EXCLUSIVE]

When writing a library it is very useful to log information. However thereare many logging implementations out there, and a library cannot impose the useof a particular one on the overall application that the library is a part of.

jcl new (4)

The Logging package is an ultra-thin bridge between different loggingimplementations. A library that uses the commons-logging API can be used withany logging implementation at runtime. Commons-logging comes with support for anumber of popular logging implementations, and writing adapters for others is areasonably simple task.

Applications (rather than libraries) may also choose to use commons-logging.While logging-implementation independence is not as important for applicationsas it is for libraries, using commons-logging does allow the application tochange to a different logging implementation without recompiling code.

Note that commons-logging does not attempt to initialise or terminate the underlyinglogging implementation that is used at runtime; that is the responsibility ofthe application. However many popular logging implementations do automaticallyinitialise themselves; in this case an application may be able to avoidcontaining any code that is specific to the logging implementation used.

The JavaDoc API documents for the latest release are available online.In particular, you should read the package overview of the org.apache.commons.loggingpackage. In addition, there is a (short)User Guide.

This release makes several changes that are intended to resolve issues that have been encountered when using commons-logging in servlet containers or j2ee containers where complex classpaths are present and multiple copies of commons-logging libraries are present at different levels.

This release also adds support for the TRACE level added to log4j in the 1.2.12 release. In former commons-logging versions, the log.trace method caused log4j to output the message at the DEBUG level (the lowest level supported by log4j at that time).

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AILA provides an updated short flyer for you to share with your clients to help answer basic questions about Temporary Protected Status (TPS). There are two versions available: a generic PDF version and a customizable Word version.

a) What will be the Current Status of the Dataset? The dataset will be a new or existing one? If it is old dataset then whether the new content must be appended at the end of the file or it should override the file?

In case, the dataset does not exist before the job runs and once the job completes successfully, then it will create a new dataset as shown here. MATEKS.TEST.BACKUP is created newly with the contents copied from MATEKS.TEST.PSFILE.

Note: In actual production, it is rare to code DISP=(NEW, DELETE, DELETE) as nobody wants to delete the file in case of Normal Disposition until it is really required to do so. This example is just to show the difference between DELETE and CATLG etc.

The varying portion of the JCL can be specified using symbolic parameters in the JOB and the static parts can be specified in the PROC. For example, if the file name changes for every JOB that uses the PROC, then the varying portion of the file name can be coded in JCL using symbolic parameter.

Dummy DD statements, data card specifications, PROCs, JOB, PROC statements cannot be coded within an INCLUDE member. An INLCUDE statement can be coded within an INCLUDE member and further nesting can be done up to 15 levels.

Using IEBEDIT in a JCL, selected steps of another JCL can be run. In the above JCL, the input JCL with 10 steps is present in MYDATA.URMI.JOBS(INPUTJOB). STEP3 and STEP7 is specified in SYSIN of IEBEDIT, so that those two steps are run.

When it is defined with DISP = (NEW,KEEP) at the time of creation. In case of a GDG, least recent generation is uncataloged if the GDG base had been defined with NOEMPTY parameter when the LIMIT is reached. All generations are uncataloged when coded with EMPTY.

GDG base can be created using IDCAMS utility. EMPTY uncataloges all the generations when the LIMIT is reached. SCRATCH physically deletes the generation, when it is uncataloged. (LIMIT specifies the maximum number of versions that the GDG base can hold).

A job time-out error can occur when the program takes more time than the time limit for the specified class. This is called a S322 abend. This error is encountered when there are some looping errors in the program and it does not reach completion.If the data processed in the program is genuinely huge and needs more time than the class limit, then the TIME parameter can be coded as TIME = 1440 to get infinite time until job completion.

NOTIFY = userid of the person (not the submitter) can be specified in the JOB statement so that the user gets a notification with the return code upon job completion. But the job log is present in the spool under the submitter's userid only.

JCL stands for Job Control Language which provides the specifications necessary to process a job. It is a set of control statements which provides the specifications necessary to process a job. It is a interface between programs & MVS operating system.

Identifiers are two slashes (//) starting from column number 1. All JCL statements starts with identifiers except for two exceptions - For a delimiter statement, /* starting in col 1 and for a comment statement , //* starting at col 1.

When the job reaches its highest priority, it is taken up for execution from the job queue. The JCL is read from the SPOOL, the program is executed and the output is redirected to the corresponding output destination as specified in the JCL.

The DSN parameter refers to the physical dataset name of a newly created or existing dataset. The DSN value can be made up of sub-names each of 1 to 8 characters length, separated by periods and of total length of 44 characters (alphanumeric).

The Data Control Block (DCB) parameter details the physical characteristics of a dataset. This parameter is required for datasets that are newly created in the job step. LRECL is the length of each record held within the dataset. RECFM is the record format of the dataset.

Further you can go through your past assignments you have done with the subject and make sure you are able to speak confidently on them. If you are fresher then interviewer does not expect you will answer very complex questions, rather you have to make your basics concepts very strong.

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Normal-termination-action specifies the system what action needs to be taken on the dataset when the job step executed successfully. The below actions are taken on the dataset when the job step is completed successfully -

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Originally, mainframe systems were oriented toward batch processing. Many batch jobs require setup, with specific requirements for main storage, and dedicated devices such as magnetic tapes, private disk volumes, and printers set up with special forms.[8] JCL was developed as a means of ensuring that all required resources are available before a job is scheduled to run. For example, many systems, such as Linux allow identification of required datasets to be specified on the command line, and therefore subject to substitution by the shell, or generated by the program at run-time. On these systems the operating system job scheduler has little or no idea of the requirements of the job. In contrast, JCL explicitly specifies all required datasets and devices. The scheduler can pre-allocate the resources prior to releasing the job to run. This helps to avoid "deadlock", where job A holds resource R1 and requests resource R2, while concurrently running job B holds resource R2 and requests R1. In such cases the only solution is for the computer operator to terminate one of the jobs, which then needs to be restarted. With job control, if job A is scheduled to run, job B will not be started until job A completes or releases the required resources. 041b061a72

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