Blog Posts - Mainframe



The 9 Best Things About IMS DB HDAM Database

All 9 points about IMS DB HDAM database: An HDAM database consists of one data set which is split into two parts: the root addressable part and the overflow part. The data set is a VSAM ESDS or OSAM data set. Click here HDAM Database Diagram After i...

Understanding The Background Of Data Modelling Cordinality.

When performing data modeling in preparation for designing a database, knowing that two entities are related to each other is not sufficient. In addition to knowing that they are related, the cardinality of the relationship must also be documented. C...

Mainframe Self Study Materials with Complex Interview Questions

The below list is the best selected interview Questions. PDF materials. You can download @Free of cost. >>>>VSAM 1.0 >>>>REXX 1.0 >>>>MVSQuest Second Edition >>>>MVSQuest Second Edition...

How to Create VSAM dataset without Using IDCAMS and Option 3.2

Many friends asked how to create VSAM dataset without IDCAMS and Option 3.2. Of course you can use tools to create VSAM dataset. Using SMS (Storage management sub system) you can create a dataset. The following parameters you need give in JCL, RECORG...

30 Awesome CICS Interview Questions to Your Next Job

What are CICS Control programs and their respective CICS control tables? PCT-KCP PPT-PCP FCT-FCP DCT-TDP JCT-JCP TCT-TCP TST-TSP Can we do Sort by the SORT verb in the CICS Program? No Can we open files explicitly in the CICS Program? NO.CiCS automat...

2 Easy Steps write your COBOL program efficient way

Always use an odd number of digits in a COMP-3 field  Since the COMP-3 field is stored as a single digit in a nibble (half of the byte), with one nibble consuming the space for the sign, we know that every time we reference an even number digit COMP...

Master CICS Release Command In Just A Few Minutes!

What is the function of RELEASE command in CICS? And why you need to use this command? The main function of LOAD and RELEASE commands are to reduce the storage used. The main benefit is dynamically we can LOAD a program to memory and we can issue CAL...

Best Mainframe Interview Questions Tips You will Read This Year

Mainframe Interview Questions COBOL Interview Questions IMSDB Interview Questions DB2 Interview Questions VSAM Interview Questions CICS Interview Questions JCL Interview Questions PLI Interview Questions APPLY BIG ANALYTICSFiled under: Mainframe Inte...

Confusing CICS commands ‘SYNCPOINT’ and ‘SYNCPOINT ROLLBACK’

SYNCPOINT- Is thread safe command. It just establishes syncpoint. Syntax: SYNCPOINT—————————————————>< SYNCPOINT ROLLBACK – Back out t...

Unix and Mainframe Basic differences

Below are the basic differences for Unix and Mainframe: Boot the system versus IPL the system Files versus data sets Editors (vi, ed, sed, and emacs (UNIX)) versus ISPF (z/OS) telnet or rlogin (UNIX) versus TSO logon (z/OS) Filed under: Mainframe App...

Mainframe -OS/390 and ZO/s difference

This question asked for many mainframe programmers. They are unable to tell correct answer. For your benefit I am giving the basic difference. OS/390: This architecture runs under 32 BIT address space Z/OS: This architecture runs under 64-BIT address...

How the Multiple versions of Package is useful in DB2

The below are the reasons, apart from our regular development, you need to keep multiple package versions in DB2. Sometimes we would like to keep multiple VERSIONs of the same PACKAGE. For example, in a fallback situation, it would be nice to have bo...

VSAM -How ESDS allows duplicate record

An entry-sequenced data set (ESDS) acts like sequential file organization but has the advantages of being under control of VSAM, some use of direct processing, and password facilities. Basically, the data set is in the sequence in which it is created...

3 Top methods to keep Mainframe+COBOL programs Web enabled

I have identified three methods, which help to keep Mainframe and COBOL modules are web enabled. Use a mechanism like EXCI or a local queue to make a request to a CICS transaction or a WebSphere Application Server application running on the z/OS syst...

How you can use ‘DISPLAY UTILITY’ in DB2

The DB2® command DISPLAY UTILITY displays the status of utility jobs, including utility jobs in a data sharing group. The output from the command consists of informational messages only. One set of messages is returned for each job identified by the...

CICS PIPELINE complete information

A CICS pipeline is shared by many different Web services, and is used to configure shared qualities of service. It is usually the CICS system programmer who is responsible for configuring PIPELINE resources. This is done using a pipeline configura...

EIBDATE in CICS and How to know when task is started in CICS

Contains the date the task is started; this field is updated by the ASKTIME command. The date is in packed decimal form (0CYYDDD+) where C shows the century with values 0 for the 1900s and 1 for the 2000s. For example, the date 31 December 1999 has t...

PegaSystems Career for Mainframe Programmers

Many guys asked us in Facebook page-Mainframe-SriniBlogs and at SrinimfJobs about suitable career for Mainframe programmers. Let us see how PegaSystems career helpful to Mainframe developers. Below Skills are expecting for PegaSystems developer: UI w...

How to Check Spool which Database calls used in IMS DB batch JCL

The following are the different methods can be used to know Buffer usage and the kind of database calls used in the IMS programs. The IMS monitor, to gather details of buffer usage and database calls over a specified time period in an IMS subsystem.

BMP Transaction oriented JCL in IMS DB

Many mainframe /IMS programmers think that BMP means batch. Actually there are two kinds of transactions. One is BMP(Batch) and the other one is BMP(Txn oriented). Usually MPPs are scheduled by IMS. But BMP(txn) are scheduled by an operator through J...


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