Anardb provides persistent classes, which can have slots indexed in hash-tables, and the ability to perform ACID transactions on them from multiple processes simultaneously. It is a bit like a prevalent database.
It requires UN*X filesystem semantics and has been tested on Allegro 8.1 x86 and AMD64 but should be portable to SBCL, etc.
Download ASDF package from http://cl-www.msi.co.jp/projects/anardb/downloads/anardb.tar.gz
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