We are hitting this bug in vFMC VMWare after upgrading from 6.6.3 to 6.6.4. However, this documentation does not state 6.6.4 is also affected. We restarted the database and the issue got resolve.
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Cisco Fire Linux OS v6.6.4 (build 3)
Cisco Firepower Management Center for VMWare v6.6.4 (build 59)
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> expert
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admin@fmc:~$