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VSAM Alternate Index: The Internal Process Details
Alternate indexes in VSAM (AIXs) allow logical records of a KSDS or an ESDS (in this context, a base cluster) to be accessed sequentially and directly by more than one key field. Here is an example VSAM alternate index. Alternate index in VSAM internal process Process flow of Alternate index in… Read More ⇢
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DB2 Distributed Computing – How it Works
What is Distributed computing? Here DBMS server process the requests send by the client. Opportunities are more if you are good at Distributed Computing. Srini How It Works Today’s Fortune 500 companies are embracing distributed techniques to access mainframe data on DB2. Although online transaction processing (OLTP) workloads still dominate… Read More ⇢
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Ultimate answer for GDG (+1) vs GDG (+2) Generation in JCL
The right answer on GDG versions and how to use correctly in JCL. Read More ⇢
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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. Cardinality is the numerical mapping between entities. This describes “how many”… Read More ⇢
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Mainframe Self Study Materials with Complex Interview Questions
At Free of cost all Mainframe materials you can download and use effectively for your interviews. Just download all materials. Read More ⇢
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COBOL Redefines: How to Use Correctly
COBOL Redefines clause top rules and example on how to use it. Read More ⇢
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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 subsystem) you can create a dataset. The following parameters you need give in JCL, RECORG=option Option==> KS or LS or RR or ES… Read More ⇢
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How to Improve COBOL Table Lookup Performance
Don’t open the file until you need it: The OPEN and CLOSE instruction generates a lot of excessive code, so the recommendation is to always put all of your files in the same OPEN and the same CLOSE. Well the default number of buffers in MVS is 5, so each… Read More ⇢
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25 Top COBOL Recently asked Interview Questions
COBOL interview questions of type multiple choice you can read and learn quickly to your next interview. Read More ⇢
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