The db functions should be used with caution.
Removing a db from the server can disrupt datastructures and running processes due to the suddenly missing objects. The server tries to catch simple, common cases of this, but there remain many ways of crashing or crippling the server this way.
Installing a db is a bit like injecting fluid into the body with a hypodermic needle: The normal system defenses are bypassed, and various security or reliability problems may result. For instance, it is fairly easy to craft a malicious .db file which will forge pointers to data which would not normally be available to a user. A .db file may also overwrite a system package pointer with an inappropriate new package, subverting existing in-db software.
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