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  • SQL NULL: Tricky Interview Question

    SQL NULL example query and how it returns when you write query. Read more.

  • Mainframe Vs Unix Top Differences

    Mainframe and UNIX operating system differences to read today.

  • 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 space.

  • JCL ‘BPXBATCH’ Utility to run UNIX commands

    Below is the sample JCL to run UNIX commands in JCL using the BPXBATCH utility. JCL to Use BPXBATCH Utility About ‘nc’: ‘nc’ is the command which runs netcat, a simple Unix utility that reads and writes data across network connections, using the TCP or UDP protocol. It is designed to be a reliable “back-end”…

  • Mainframe -Powerful features of Zo/s system

    Zos powerful features Uses address spaces to ensure isolation of private areas Ensures data integrity, regardless of how large the user population might be. Can process a large number of concurrent batch jobs, with automatic workload balancing Allows security to be incorporated into applications, resources, and user profiles. Allows multiple communications subsystems at the same…

  • DB2 Package and Its Versions

    Here are the details about DB2 packages, and the need to keep multiple versions. The previous versions useful during code-blackout times, so that you can restore previous code correctly. DB2 Package Versions Sometimes we would like to keep multiple VERSIONs of the same PACKAGE. For example, in a fallback situation, it would be nice to…

  • 3 Top Methods to Access COBOL Program from Web

    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 system. From this runtime environment, make an outbound web services call. Interestingly…

  • Top Reasons Why ESDS VSAM File Allows Duplicate Values

    ESDS VSAM why it allows duplicate records whereas KSDS does not allows read for more details.

  • DB2 Bind: Step-by-step Guide to Use Package Versions

    Creating a package version: If you want to run different versions of a program without needing to make changes to the associated application plan, use package versions. This technique is useful if you need to make changes to your program without causing an interruption to the availability of the program. You can create a different…

  • How to Check Status of Utility Jobs 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 command. For utility jobs in a data sharing group, the output shows the member…

  • Big Data and Analytics with DB2 v11

  • DB2: The Real Benefit of Data Redundancy

    Steps you always need to increase the availability of database. Read more.