This may be a bug of BDB's Queue Method, sometime it can not recycle
the database file normally. Here's a workaround way, try to
reconfigure the -E option. The default setting is 131072, that means
if your page size is 4K, you single database file size is 512MB, you
may set this option half of or 1/4 of default value, keep the db file
small.
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Best Regards,
Steve Chu
http://stvchu.org