While I'm not aware of the reasoning behind the request I'd assume that if the database was to be encrypted then you wouldn't want unencrypted cache files hanging around on the local file system.
You might want to look into encrypted filesystems as a lower level solution. http://www.google.com.au/search?q=linux+encrypted+filesystems
I'd suggest taking a step back and identifying the security requirements and then looking for appropriate solutions to meet those requirements.
While I'm not aware of the reasoning behind the request I'd assume that if the database was to be encrypted then you wouldn't want unencrypted cache files hanging around on the local file system.
That's what I have looked into for the past day. I think you're right. And I think it will be easier and less of a kludged feel to it once done. Thank for the push, I found several great write ups on encrypting the freeBSD system this will run on. I am pushing this out as an experiment tomorrow, so we will see how this goes :)
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