Installing images makes them "known" to the system. Images are installed with the OpenVMS INSTALL utility.
An installed image may be:
Shared among many users for better memory utilization and reduced paging for improved performance.
Protected, so that it may perform system level functions without the risk of misdirection.
Privileged, so that it can perform tasks on behalf of users who would not otherwise have the required privileges
Run by users who do not have privileges to the directory where the image is stored.
Started more efficiently than one which is not installed.
Installing an image requires a modest amount of system reserved memory. To perform an installation, you must have CMKRNL privilege, which is generally restricted.
GTMSECSHR is a small image that manages interprocess communication for database operations. Install this image as a protected shareable image.
You may wish to install the GT.M run-time system, GTMSHR, as a shareable image because of its frequent usage. Because they may also be heavily used, you may wish to install the compiler entry, MCOMPILE, and direct mode, GTM$DMOD, even though they are small and not shareable.
The VMSINSTAL distribution kit produces the GTMINSTALL.COM file. GTMINSTALL.COM uses the OpenVMS INSTALL utility to make the GT.M images known to VMS. Review and edit this file, if appropriate. For more information refer to this manual's "Installing GT.M" chapter.