Henry Spencer:
The problem here is that mkhistory's invocation of dbz needs to be smarter;
just plain "dbz" doesn't scale up well to high volume.  This has been on
my to-do list for some time; I didn't expect it to become a critical issue
for real users quite so soon.

The workaround is to give dbz an option along the lines of `-p 700000' to
indicate how big a database it should expect, so it can size its hash
tables accordingly.  If you've got a reasonably modern mkhistory,
"mkhistory -s 1" should arrange this automatically.  (This should
probably become the default.)

Documentation on dbz is in the dbz source subdirectory.

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