Configuring Dynamically Mapped Shared Memory (DSHM)

The Dynamically Mapped Shared Memory (DSHM) feature is a separately licensable add-on package that enables single instance databases to use very large (over 4GB) main memory on ix86 family systems. You can purchase DSHM from your software vendor or from SCO.

To configure DSHM:

1. Add the dshm package to your system.

2. You must set the DEDICATED_MEMORY parameter in order to use DSHM. All dedicated memory is available for DSHM use.

   You might also want to set the INVLPG_MAX parameter. Though they act independently, DEDICATED_MEMORY and INVLPG_MAX both affect DSHM. The INVLPG_MAX parameter is only used for DSHM.

The Section 3dshm manual pages contain information about DSHM routines. Additional information about configuring and using DSHM, and writing programs to be DSHM-aware, is provided with the dshm package.