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Parameter
PHYS_MEMSIZE Short text
Available main memory for the SAP instance
Important
This parameter is only valid for Microsoft Windows NT.
The value defines how many megabytes of the main memory are to be usedfor the SAP instance. The default value for PHYS_MEMSIZE is the size ofthe main memory in megabytes. That is, it is automatically adjusted ifthe main memory configuration is changed. With this value, the defaultvalues for the following memory management parameters are automaticallycalculated and you therefore do not need to maintain them manually.
em/initial_size_MB =
[PHYS_MEMSIZE] If necessary, the extended memory extends itself by thevalue [PHYS_MEMSIZE / 2].
With PHYS_MEMSIZE, the maximum number of users UC] is calculated.
rdisp/ROLL_SHM =
[UC] * 100 ( 100 blocks per user)
rdisp/ROLL_MAXFS =
[UC] * 100 ( 100 blocks per user)
rdisp/PG_SHM =
[UC] * 50 ( 50 blocks per user)
rdisp/PG_MAXFS =
32768
Aim
The new default values for memory management under Microsoft Windows NTmean that you do not need to manually maintain the profile parameters.With PHYS_MEMSIZE, all memory management is calculated and adjusted. Inthis case, you only need to maintain this value if the SAP instance maynot use the entire working memory.
Example 1
With a central instance with 1 GB of main memory, the database uses 400MB and the application server uses 600 MB. In this case, manually setthe value for PHYS_MEMSIZE to 600 in the instance profile. (Noadditional adjustments required)
Example 2
There are two dialog instances (for example, a production system and atest system) on one system (1 GB). With PHYS_MEMSIZE, the main memoryis now divided between the two SAP instances.
For example: Production system
PHYS_MEMSIZE = 700
Test system
PHYS_MEMSIZE = 300
Example 3
A dialog instance on a host. That is, the SAP instance can use theentire main memory and it is therefore not necessary to manuallymaintain PHYS_MEMSIZE, because its default value is set to the size ofthe main memory. Work area
System Parameter unit
1 MB Default value
[Size of the main memory] Who is allowed
Customer. Only change, if the SAP instance may not use the entireworking memory. (for example: central instance, multiple instances onone machine) Limitation for os
Parameter is only valid for Microsoft Windows NT. Limitation for db
Only Microsoft Windows
The default values of the following parameters are calculated based onPHYS_MEMSIZE
em/initial_size_MB =
PHYS_MEMSIZE (extended by PHYS_MEMSIZE / 2) rdisp/ROLL_SHMrdisp/ROLL_MAXFS rdisp/PG_SHM rdisp/PG_MAXFS |