A paravirtualized operating system is an operating system (OS) that is modified to run in a paravirtualized environment that provides a software interface to virtual machines, similar but not identical to that of the underlying hardware. In paravirtualized mode, the guest OS is explicitly ported for the para application programming interface (API)...
In general, an attribute is a characteristic. In a database management system (DBMS), an attribute refers to a database component, such a table. It also may refer to a database field. Attributes describe the instances in the row of a database.
Think of a table in a relational database as being analogous to a spreadsheet. An attribute is simply one non-null cell in the spreadsheet, or the conjunction of a column and row. It stores only one piece of data about the object represented by the table in which the attribute belongs. For example, the attributes in an invoice might be price, number, date or paid/unpaid, etc.
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