Configuration for AIX
For most of the profile parameters the default values are also correct for AIX. Only with a few AIX-specific parameters might you have to change the parameter values.
The following recommendations are valid only for the 64 bit platform.
Recommended parameters in the instance profile:
|
Parameter |
Recommendations |
Meaning |
|
ES/TABLE |
SHM_SEGS |
Switches to the alternative implementation of the extended memory (EM) |
|
EM/TOTAL_SIZE_MB |
262144 (256 GB) |
This limts the EM to 256 GB, which on many machines amount to a lifting of the restriction. By decreasing the parameter, the EM can be limited. |
The following parameters should only be changed after consulting with SAP.
|
Parameter |
Default |
Meaning |
|
ES/SHM_PROC_SEG_COUNT |
16 |
Specifies the number of shared memory segments that are used as shared and privately. |
|
ES/SHM_MAX_PRIV_SEGS |
15 |
Specifies the number of shared memory segments that are used privately. Caution
This parameter must be lower than es/shm_proc_seg_count. |
|
ES/SHM_MAX_SHARED_SEGS |
1 |
Specifies the number of shared memory segments. The value comes from ES/SHM_PROC_SEG_COUNT- ES/SHM_MAX_PRIV_SEGS |
|
ES/SHM_USER_COUNT |
8192 |
The maximum number of users in all open sessions. |
|
ES/SHM_SEG_COUNT |
8192 |
The maximum number of AIX system segments that ESSHM uses. |
|
ES/SHM_SEG_SIZE |
4096 (4GB) |
Size of the AIX system segments (in megabytes) Caution
Be aware that the operating system parameters also have to allow this segment size. |
These recommendations depend not only on whether the alternative method of implementing extended memory is active, but also on the AIX version used.
The following SAP Notes relate to memory management under AIX:
