Configuration for AIX
Prerequisites
For most of the profile parameters the default values are also correct for AIX. Only with a few AIX-specific profile parameters might you have to change the parameter values.
Procedure
Recommended profile parameters in the instance profile:
|
Profile Parameter |
Recommendations |
Explanation |
|
ES/TABLE |
SHM_SEGS |
Switches to the alternative implementation of the extended memory. |
|
EM/TOTAL_SIZE_MB |
512000 |
By decreasing the profile parameter, the extended memory can be limited. |
The following profile parameters should only be changed after consulting with SAP.
|
Profile Parameter |
Default |
Meaning |
|
ES/SHM_PROC_SEG_COUNT |
3 |
Specifies the number of shared memory segments that are used as shared and privately. |
|
ES/SHM_MAX_PRIV_SEGS |
2 |
Specifies the number of shared memory segments that are used privately. |
|
ES/SHM_MAX_SHARED_SEGS |
(($(em/global_area_MB)+ $(abap/shared_objects_size_MB)+ $(rtbb/buffer_length)/1024+ $(zcsa/table_buffer_area)/1024/1024)/ $(ES/SHM_SEG_SIZE)+ 1) |
Specifies the number of shared memory segments. |
|
ES/SHM_USER_COUNT |
1024 |
The maximum number of users in all open sessions. |
|
ES/SHM_SEG_COUNT |
1024 |
The maximum number of AIX system segments that ESSHM uses. |
|
ES/SHM_SEG_SIZE |
4096 (4GB) |
Size of the AIX system segments (in megabytes) |
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:
