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Status Delivered
Categories Runtime
Created by Guest
Created on Dec 5, 2011

TCB Switch for Java applications with each access to DB2

In the past we invested a lot of work to get our Assembler and COBOL applications threadsafe. As a consequence we avoid a lot of TCB switches between the QR TCB and the L8 TCB. This saves a lot of CPU and improves the response time. With Java, in our environment the JVMServer, we get this back, means with each DB2 access we see a TCB switch between T8 and L8 TCB. Please change the runtime in a way that the whole processing ( Java and DB2 ) runs with one TCB.

Idea priority Urgent
  • Guest
    Reply
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    Oct 5, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Transaction Processing
    Product - CICS Transaction Server

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - CICS Transaction Server

  • Guest
    Reply
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    Dec 13, 2012

    This requirement is satisfied by CICS TS 5.1 which is generally available December 14th 2012.

  • Guest
    Reply
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    Oct 4, 2012

    This RFE is satisfied by CICS TS 5.1 which was announced on October 3rd 2012 and has a planned GA of December 14th 2012.

  • Guest
    Reply
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    Feb 25, 2012

    This is something we plan to address, not only for the pure Java case but for the mixed language case as well. Even for the pure java case, the TCB is released when the Java program returns to CICS, so we need to be able to move the thread and drive end of task syncpoint on another TCB. The status of the RFE is being changed to Planned for Future release. Please note:
    IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion.   Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision. The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract. The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.

  • Guest
    Reply
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    Jan 20, 2012

    If it is not possible to implement it for mixed language applications than it is better to imlemplement it for pure Java transaction than to change nothing.

  • Guest
    Reply
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    Jan 20, 2012

    It would be very usefull for mixed language ( Cobol + Java ) transactions because in the first years I expect a lot of mixed language transaction because not all services can be migrated to Java in one step. This will be a process which lasts some years.

  • Guest
    Reply
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    Jan 12, 2012

    Magnus, please can you confirm whether the solution is required for applications that are mixed language or for pure java applications..

  • Guest
    Reply
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    Dec 7, 2011

    So are the applications involved pure Java or are there mixed languages involved, for example Cobol and Java in the same transaction ? One of the reasons the DB2 thread is assigned to an L8 TCB is because if the DB2 thread has to be shared between Java JDBC and Cobol EXEC SQL then it has to be on an L8 because a threadsafe cobol application cannot run on a T8 as it has batch LE and not CICS LE.
    For pure Java applications then we may be able to attach the thread to a T8. For mixed applications we may have to move the thread (not currently possible mid uow). If the cost of moving the thread is not cheap, then we won't save anything, we just replace the cost of a TCB switch with the cost of moving a thread between TCBs.