Michael,

               just had the latest failure, nothing unusually large with the *.db files:

16K     /usr/local/freeswitch/db/call_limit.db

148K    /usr/local/freeswitch/db/core.db

8.0K    /usr/local/freeswitch/db/fifo.db

76K     /usr/local/freeswitch/db/sofia_reg_external.db

504K    /usr/local/freeswitch/db/sofia_reg_internal.db

8.0K    /usr/local/freeswitch/db/sofia_reg_internal.db-journal

76K     /usr/local/freeswitch/db/sofia_reg_internal-ipv6.db

16K     /usr/local/freeswitch/db/voicemail_default.db

When I restarted the daemon, the usage over a few minutes jump up to 24%,  only a reboot could  fix it.   

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Babstar