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(am-utils.info)ndbm maps

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ndbm maps
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   An ndbm map may be used as a fast access form of a file map.  The
program, `mk-amd-map', converts a normal map file into an ndbm database.
This program supports the same continuation and comment conventions that
are provided for file maps.  Note that ndbm format files may _not_ be
sharable across machine architectures.  The notion of speed generally
only applies to large maps; a small map, less than a single disk block,
is almost certainly better implemented as a file map.

   ndbm maps have a default cache mode of `all' (Note: Automount
Filesystem).