SHMADD

onconfig.std value

8192

range of values

32-bit platforms: 1024 through 524288
64-bit platforms: 1024 through 4294967296

units

Kilobytes

takes effect

When the database server is shut down and restarted

utilities

onstat -g seg (Use the onstat -g seg command to display the number of shared-memory segments that the database server is currently using. For more information, see page ***)

refer to

The following material in the IBM Informix Administrator's Guide:

• Virtual portion of shared memory, in the shared-memory chapter
• Monitoring shared-memory segments with onstat -g seg, in the managing memory chapter

SHMADD specifies the size of a segment that is dynamically added to the virtual portion of shared memory.

It is more efficient to add memory in large segments, but wasteful if the added memory is not used. Also, the operating system might require you to add memory in a few large segments rather than many small segments.

The following table contains recommendations for setting the initial value of SHMADD.