Packages marketed as database management systems do not necessarily possess all the
facilities described above, nor are the facilities they do possess necessarily implemented
to the same level. For example, one system may have excellent program/data
independence but be poor on recovery; another system may have extensive data
structuring features but poor program/data independence. It is probably pointless to
debate whether there is a minimum set of facilities which are essential to a database
management system; what matters is whether the user’s needs are met or not, and
different users can have widely ...
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