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This is the path and filename to a database which will cache MD5 checksum values server-side. This optimization is only available if you have the Berkeley database library `libdb' on your system. If this variable is not defined, no database caching will be used and checksum values will be computed directly on request. The utility of this solution is a trade-off between the time it takes to compute the checksum versus the time for a disk-based lookup.
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