SAP Shared Memory (SHM)

 

SAP Shared Memory (SHM):

SAP shared memory is a shared memory resource in SAP Memory Management in which various buffer data are stored. SAP SHM provides a shared memory that is shared by all work processes. It is based directly on the shared memory of the operating system. It comprises SAP SHM segments that are divided into local and global segments. 

Local SAP SHM segments can be used by all work processes of one application server instance (AS instance). Global SAP SHM segments can be used by all work processes of all AS instances running on the same host The size of the shared memory pools is defined in the parameter ipc/shm_psize_<xxx>. The parameter is valid on all operating systems. However, the creation of the pools is heavily dependent on the operating system.

Reference:

1. help.sap.com 
2. SAP Notes 
3. Linkedin