Threadsafe Considerations for CICS

Threadsafe Considerations for CICS

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Beginning with IBMAr CICSAr Version 2, applications can run on TCBs apart from the QR TCB, which has positive implications for improving system throughput and for implementing new technologies inside of CICS. Examples of implementing new technologies include using the IBM MVSTM Java virtual machine (JVM) inside CICS and enabling listener tasks written for other platforms to be imported to run under CICS. The newest release, CICS Transaction Server for z/OSAr (CICS TS) V4.2, includes scalability enhancements so that you can perform more work more quickly in a single CICS system. The advantage of this enhancement is that you can increase vertical scaling and decrease the need to scale horizontally, reducing the number of regions that are required to run the production business applications. The scalability enhancements in CICS TS V4.2 fall into two broad areas, which are increased usage of open transaction environment (OTE) and of 64-bit storage. This IBM RedbooksAr publication is a comprehensive guide to threadsafe concepts and implementation for IBM CICS. This book explains how systems programmers, applications developers, and architects can implement threadsafe applications in an environment. It describes the real-world experiences of users, and our own experiences, of migrating applications to be threadsafe. This book also highlights the two most critical aspects of threadsafe applications: system performance and integrity.Chris Rayns, George Bogner, Philip Hale, Em James, Peter Klein, John Tilling, IBM Redbooks. Example 7-7 is a CICS trace of a threadsafe CICSAPI application program making a DB2 call on an open L8 TCB. ... AP 3181 D2EX1 EXIT APPLICATION-REQUEST SQLCODE -805 RETURNED ON EXEC SQL SELECT =000259= 54910 L800I MN 0201 MNMN ENTRY ACCUMULATE_RMI_TIME DSNCSQLanbsp;...

Title:Threadsafe Considerations for CICS
Author: Chris Rayns, George Bogner, Philip Hale, Em James, Peter Klein, John Tilling, IBM Redbooks
Publisher:IBM Redbooks - 2012-04-05

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