Database administration encompasses such tasks as installing and configuring the DBMS, backing up the data, adding users and setting their various permissions, applying updates or new capabilities to the system, and similar tasks. If you just have yourself and a fairly small lab to deal with, it's not too bad. But organizations often hire one or more database administrators to do this work full time; even a smallish project, if it's critical and the budget exists, can benefit from the attention of a professional database administrator.read more.
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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