Appendix A. Details of what is detected

This appendix describes what is detected by the Detector and Reporter for each affinity type. Additionally, it highlights the differences, if any, with what the Scanner detects. (In general, the Scanner always detects more, because it covers paths that may not get exercised by the Detector, and because it cannot see beyond the command argument zero to eliminate commands that do not actually cause affinity.)

This information adds details to the general description in ªWhat is detectedº on page 13.

This chapter contains the following information: v ªENQ/DEQº

v ªTS commandsº on page 66

v ªLOAD HOLD/RELEASEº on page 66 v ªRETRIEVE WAIT/STARTº on page 66 v ªADDRESS CWAº on page 67

v ªGETMAIN SHARED/FREEMAINº on page 67 v ªLOAD/FREEMAINº on page 67

v ªCANCEL/DELAY/POST/STARTº on page 68 v ªSPI commandsº on page 69

v ªWAIT commandsº on page 69

 

ENQ/DEQ

 

v The affinity here is between all transactions that ENQ or DEQ on a given

 

resource. The match is made on the resource.

 

v It is possible for the ENQ/DEQ resource to be either a character string of length

 

1 to 255 bytes, or an address (which has an implied length of 4 bytes).

v The affinity relation can be GLOBAL, BAPPL, or USERID.

 

v Lifetime is always SYSTEM.

 

v Commands that result in a LENGERR condition are grouped together and treated

 

as a resource of 'LENGERR'. Any other condition results in a valid resource and

 

does not affect the treatment of the command.

 

v Because of affinity record size limitations, character string resources of greater

 

than 207 bytes in length are compressed to 207 bytes. The compression is

 

achieved by removing bytes from the middle of the string (these are probably

 

less signi®cant than those at either end). This means that such resources may be

 

¯agged as being the same when they are not, if the only variation is in the

 

removed bytes. Check all such compressed resources to see if that is the case.

 

The Reporter ¯ags such compression, and pads the resource back out to the

 

correct length for the report, by inserting '?' characters.

© Copyright IBM Corp. 1994, 1999

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IBM OS manual Appendix A. Details of what is detected, Enq/Deq
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OS specifications

IBM OS, or IBM Operating System, refers to a family of operating systems developed by IBM to support its hardware architectures. IBM has produced a range of OS versions tailored for different computing needs, such as mainframes, servers, and personal computers. Among the most notable operating systems in IBM's portfolio are OS/2, z/OS, and AIX, representing a blend of innovation and reliability that has defined IBM's reputation in the computing world.

One of the defining features of IBM OS is its robust multitasking capabilities. Both z/OS, predominantly used in IBM's mainframe environments, and AIX, the Unix-based system for IBM Power Systems, support multiple users and processes simultaneously. This ability allows organizations to run numerous applications in parallel efficiently, maximizing resource utilization and improving productivity.

In terms of security, IBM OS incorporates advanced features aimed at protecting data and maintaining integrity. z/OS offers multifactor authentication, data encryption, and a security model that adheres to the latest regulatory requirements. AIX provides Secure Virtualization, which enhances isolation and security in cloud environments, essential for enterprises handling sensitive information.

Another key characteristic is the adaptability of IBM OS to modern technologies. For instance, z/OS is designed to integrate with cloud computing, open source, and DevOps practices. This adaptability supports organizations in modernizing their infrastructure while retaining the stability associated with IBM solutions. AIX similarly supports containerization and virtualization, which are critical for optimizing resource usage in dynamic computing environments.

IBM's commitment to scalability is evident across its OS offerings. Organizations leveraging z/OS can handle enormous workloads and transactional volumes, making it a preferred choice for industries like finance and telecommunications. AIX also supports scalability, allowing businesses to expand their computing resources as demands grow without significant downtime.

The availability of development tools and environments is another noteworthy aspect of IBM OS. With robust IDEs and programming languages support, developers can create and deploy applications smoothly. This assists businesses in streamlining their development processes and improving time-to-market for innovative solutions.

In summary, IBM OS encompasses a suite of operating systems characterized by multitasking, security, adaptability to modern technologies, scalability, and comprehensive development support. These features have cemented IBM's position as a leader in enterprise solutions, allowing organizations across various industries to thrive in an increasingly digital world.
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