Key Parameters Help Optimize SAP Extended Memory on AIX 64-Bit Kernel

  • by Vipul Shah, SAP Basis Consultant, Performance Analyst
  • June 28, 2010
Properly managing your system memory can lead to improved performance and lower operating costs. Find out how SAP Extended Memory helps you achieve these goals and discover the main parameter settings to help solve common memory challenges.
Key Concept
Disclaiming means releasing the memory that is allocated to the SAP application or user back to the operating system. Parameters such as ES/SHM_DISC* control the disclaiming of the memory segments.

Most performance problems come from memory issues. It is a common misconception that whenever any transaction runs in an SAP system, memory is mainly controlled by only two parameters — ZTTA/ROLL_EXTENSION and EM/TOTAL_SIZE_MB. This is not quite true because although these parameters are important, you also need to be aware of additional parameters to ensure optimal memory use. You can avoid these memory issues if you know how best to use extended shared segments parameters. 

Vipul Shah

Vipul Shah has a master’s degree in software engineering from BITS Pilani, India, and was an SAP Basis consultant and team lead for incident, change, and problem management. He started his career at Wipro Technologies as an SAP Basis consultant and was part of two implementation projects and a performance analyst for five different support projects. He also implemented Sarbanes-Oxley compliance for a Basis project with the ITIL process and ISO 20K standards. He has also achieved his certification in end-to-end root cause analysis from SAP.

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