Upgrade to OpenEdge 10.2B08, 11.3 or later.
A new IDXBUILD parameter: -freeTF for merge buffer memory management.
0 -- Do not explicitly free merge buffer memory. The default for Windows 64-bit.
1 -- Explicitly free merge buffer memory. The default for all Unix platforms and Windows 32-bit.
The value is determined and set automatically by _dbutil.
-freeTF 0 will avoid freeing merge buffers on exit if the OS is Windows64 and will let OS to free them instead.
For other Operating Systems, _dbutil will continue to free the memory explicitly, eg -freeTF 1.
Again, this is determined automatically by the idxbuild process itself but can be changed if required.