It also maintains hardware communication requirements. Task Control Program KCP is used to simultaneously control the execution of tasks and its related properties.
Introduction to TSQ and why we need to use Qs a. Temporary storage Queues b. Transient data Queues 2. It is created and deleted dynamically by application program without specifying anything in the CICS Control table as long as recovery of data is not required.
We can use TSQ as a scratch pad. They can be readrepeatedly read and even updated. Same transaction From same terminal From different terminal 4. Recoverable TSQ are the one for which the entries should be made in the temporary storage table.
Concept of TSQs Cont.
Q id The terminal id should be included for terminal dependent Task, pseduconversational in Q id in order to ensure that TSQ is unique to that task. These transactions dequeue the data that they are to process. Scrollable screensIn Brief We are writing all data to queue This particular screen has 15 records in one page, so item no 1 of queue has 15 lines data and as we finish writing 15 lines on item no 1 of Q we increment page index by one i.
We can save the screen data in TSQ and later retrieve it for review and correction Report printing: When the number of records in an Intrapartition queue reaches a predefined count a special task is automatically initiatedExtrapartition TDQUnlike Intrapartition queues, extrapartition queues can be accessed by other CICS programs as well as batch programs executing outside of the CICS partition or region This TDQ is a separate physical file and can reside on any sequential device, such as disk or tape.
This is not valid for Extrapartition TDQs. They can be read any number of times and are never removed from the queue until the entire queue is purged Transient data queues must be read sequentially, and each element can be read only once. After a transaction reads an element, that element is removed from the queue and is not available to any other transaction.
Today we have learnt how TSQs can be effectively utilized to scroll pages.
We also now know that the technique coded once can act as reusable component in future programs involving same technique.Dec 26, · ITEMERR occurs in any of the following situations: The item number specified in a WRITEQ TS command with the REWRITE option, is not valid (that is, it is outside the range of entry numbers assigned for the queue).
Jun 18, · CICS – Customer Information Control System Task – The fundamental unit of work scheduled by CICS such as Read from file, write to file, read from workstation, write to workstation, initiate another task, call another function and so on.
Error 44 is related to a CICS translation error. Read the most frequently asked top CICS interview questions and answers for freshers and experienced job interview questions pdf CICS Interview Questions and Answers List 1. What is CICS? CICS (Customer Information Control System) is a transaction server that runs primarily on IBM mainframe systems under z/OS and z/VSE.
CICS is a transaction manager. The system log is a CICS journal file used during emergency restart to provide recovery for in-flight-tasks. In addition to the information found in all dynamic log areas, the system log also contains information normally found in virtual storage during the task's recovery.
CICS is a DB/DC system which is used in online applications.
CICS was developed because batch operating system can execute only batch programs. CICS programs can be written in COBOL, C, C++, Java, etc. These days, users want information within seconds and in .