The users who use easy-to-use menu are called
Answer: B
Correct answer: Naïve users.
Naive (or parametric) users interact through a prepared interface - menus, forms, a screen with a few fields - and never write a query. A bank teller is the standard example. Sophisticated users write their own SQL; stand-alone users work with a personal database of their own.
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The method of access which uses key transformation is known as
Answer: B
Correct answer: Hash
Hashing applies a transformation to the key value to compute the address of the record directly, so a lookup takes one access with no index to search. The price is that a hash file supports no range queries and needs a strategy for collisions.
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A database has a built-in capability to create, process and administer itself.
Answer: B
Correct answer: False
A database is the stored data; it has no capabilities of its own. Creating, processing and administering it is the work of the DBMS, a separate program. The distinction is easy to lose because products such as Access present both as one thing.
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A primary key combined with a foreign key creates
Answer: A
Correct answer: Parent-Child relationship between the tables that connect them
A foreign key holds values that must exist as a primary key in another table, which makes that other table the parent and this one the child. The arrangement gives a one-to-many relationship and lets the DBMS enforce referential integrity - no child row may point at a parent that does not exist.
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In an E-R diagram a derived attribute is represented by
Answer: D
Correct answer: Dashed ellipse
A dashed (broken) ellipse marks a derived attribute - one computed from other data rather than stored, such as age derived from date of birth. A plain ellipse is an ordinary attribute, a double ellipse a multivalued one, and a rectangle an entity set.
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The method in which records are physically stored in a specified order according to a key field in each record is
Answer: A
A method in which records are physically stored in a specified order according to a key field in each record is hash. (In hash method, a hash function is performed on the key value to determine the unique physical address of the record to store or retrieve)
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The following are components of a database except ________ .
Answer: C
Correct answer: reports
A database holds user data, metadata describing its own structure, indexes and other overhead structures, and application metadata. A report is produced from the database by an application; it is output, not a component of the database itself.
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Helping people keep track of things is the purpose of a(n) ________ .
Answer: A
Correct answer: database
The purpose of a database is to keep track of things - and the “things” may be of many kinds, with relationships among them. A table holds one kind of thing, an instance is one particular database, and a relationship connects two tables; none of them is the purpose.
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A primary key if combined with a foreign key creates
Answer: A
Correct answer: Parent-Child relationship between the tables that connect them.
A foreign key must match a primary key in another table, which makes that table the parent and this one the child. The result is a one-to-many relationship, and it lets the DBMS enforce referential integrity: no child row may refer to a parent that does not exist.
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The XML family of standards is very important in database processing today.
Answer: A
Correct answer: True
XML matters in database processing as the standard way of moving structured data between systems that share no common database: web services, business-to-business exchange, configuration and document storage. Most DBMS products now store and query XML directly, and the family of related standards - XPath, XSLT, XML Schema - goes with it.
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