Sun Solaris
To adjust shared memory segments of the operating system,
add the following line to the configuration file
/etc/system,
where
x is the number of shared memory segments:
set shmsys:shminfo_shmseg=x
The method of controlling system resources is to add an entry
to the file
/etc/project such
as the following, where
project.max-shm-memory=(privileged,17179869184,deny) is
the name for the project parameter:
project-sybase:200:For use by Sybase:sybase:sybase:
project.max-shm-memory=\(privileged,17179869184,deny)
-
privileged – is
a threshold value on a resource control that constitutes a point
at which local actions can be triggered, or global actions, such as logging
in to a machine can occur. You can abbreviate this to
priv.
The three levels of
privilege are:
-
basic – the owner of the
calling process can modify
-
privilege – privileged
callers can modify
-
system – fixed for
the duration of the operating system instance
-
project.max-shm-memory – is
the value of the maximum shared memory. The default value for project.max-shm-memory is
25% of the physical memory on the system. The maximum value
is UINT64_MAX, which works out to 18,446,744,073,709,551,615
bytes, so essentially, this is limited only by the size of physical
memory. To set the value, use:
-
prctl – to
set project.max-shm-memory while
the system is running
-
rctladm – to set things
permanently
-
deny – means attempts
to use more than 16GB are denied.
Adjust shared memory segments if Adaptive Server cannot obtain
large memory as a single segment or if Backup Server stripes fail
due to insufficient segments.
Depending on the number and types of devices you use for backup
(dump) and recovery (load),
you may need to adjust the shared memory segment parameter in the
operating system configuration file to accommodate concurrent Backup Server
processes. There are six default shared memory segments available for
process attachments.
If any reconfiguration through sp_configure requires
additional memory Adaptive Server allocates shared memory segments after
start-up. To account for these additional segments, allocate
the maximum memory available to Adaptive Server by
using the allocate max shared memory configuration
parameter. See the System Administration Guide.