11.1 Parameter Sets Controlling IPC Resources
On a UNIX system, the Oracle Tuxedo system uses the IPC resources provided by the UNIX operating system, which are controlled by the tunable parameters listed in the following table:
Table 11-1 Tunable Parameters
| Prefix of Tunable Parameters | Resources Controlled |
|---|---|
SHM |
Amount of shared memory |
SEM |
Number of semaphores |
MSG |
Size of message queues and messages |
The settings for these parameters are application-dependent. Most UNIX systems are shipped with default values that are too low for an Oracle Tuxedo application.
Because the IPC parameters vary across different versions of the UNIX system, the descriptions provided in the following sections are generic. For the exact parameter names and defaults for each platform and for information on how to change parameter values, see Oracle Tuxedo 22c Release (22.1.0.0.0) Platform Data Sheets. If you change a parameter value, then must rebuild the kernel and reboot the operating system, using standard administrative tools. Consult your operating system administrator or the system administrator’s guide for your platform for details.
If your Oracle Tuxedo application is distributed, the minimum IPC resources must be available on every UNIX platform participating in the application.