Parameter
em/address_space_MB
Short text
Space reserved for user context in work processes
Parameter Description
This parameter defines the size (in MB) of the address space that is provided for the memory class “extended memory” in a work process. This also defines the total maximum size of extended global memory and extended memory for a single user context. The value is only relevant on operating systems that implement extended memory with mapped files, that is, operating systems that map extended memory in the address space of the process (Microsoft Windows NT, Linux, AS/400). A targeted setting of the value is required to make optimal use of the limited address space on 32 bit platforms or on 64 bit platforms if an extremely large amount of extended global memory or extremely large user contexts are required. The size of the address space for a process under 32 bit Microsoft Windows NT is 2 GB.
Rule of thumb
Code + roll area + total (buffers) + em/address_space_MB < 2GB
Approximately:
100MB+ 10MB + ? + ?
Application Area
Extended Memory
Parameter Unit
1 MB
Default Value
512 for 32-bit
4GB or 8GB for 64-bit
Who is permitted to make changes?
Customer
Operating System Restrictions
Applies only for Microsoft Windows NT and Linux
Database System Restrictions
None
Are other parameters affected or dependent?
None
Values allowed
Approximately 512 to 1500 for 32 bit or if required for 64 bit
Values allowed
512 to 1500
