The phrase "I/O bootstorms" refers to the problems that arise when many individual users simultaneously boot up a common operating system. This usually happens in systems that use a virtual desktop infrastructure environment, where each system has many individual users logging onto the same operating system built into a virtual network.
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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