I have need to work with large, complex data structures (~ 100,000 rows, hashes of hashes etc.), and don't want to overload our Solaris Unix memory. I've heard about the Perl DBM, MLDBM etc, and thought these would be the answer to my problems. However, when i attempted to use the MLDBM (chosen because, per literature, it allows storage of complex data structures, direct modifications etc.) I found I couldn't use hash-like functions such as exists. Is there another commonly used/distributed DBM utility that allows this sort of thing? What would be considered the "industry standard" for this type of activity these days?