Related Questions
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A DBMS is a ____ user if at most one user can use the system and is mostly restricted to personal computer systems.
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Cascading rollback is avoided in all protocol except
A. strict two-phase locking protocol.
C. two-phase locking protocol
D. validation based protocol.
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_____clause is an additional filter that is applied to the result.
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Processed data is called _____
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The set of all values that can be taken by the attribute is called as _______ of the attribute.
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In SQL the word natural can be used with
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The data models defined by ANSI/SPARC architecture are
A. Conceptual, physical and internal
B. Conceptual, view and external
C. Logical, physical and internal
D. Logical, physical and view
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A ____ key specifies a uniqueness constraint that no two distinct tuples in any state r of relation R can have the same value for super key.
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The ______ indexes are forced to store only record IDs in the data structure and require at least one additional I/O Operation to retrieve the actual record.
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Which of the following concurrency control schemes is not based on the serializability property?
C. Time-stamp based locking
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Which of the following is not a logical database structure?
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Relations produced from an E-R model will always be
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Data items grouped together for storage purposes are called a
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The _______ is a set of programs to use and / or modify this data.
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A top-to-bottom relationship among the items in a database is established by a
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_____ command can be used to modify a column in a table
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______contains information that defines valid values that are stored in a column or data type.
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Which of the following is not a consequence of non-normalized database?
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What will be the number of columns and rows respectively obtained for the operation, A- B, if A B are Base union compatible and all the rows of a are common to B? Assume A has 4 columns and 10 rows; and B has 4 columns and 15 rows
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4
Which of the following addressing modes permits relocation without any change over in the code?
C. PC relative addressing
D. Base register addressing
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4
Relational Algebra does not have
C. Aggregation operators.
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In an ER model,_____ is described in the database by storing its data.
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A weak entity has an ______ dependency on its owner entity, which can be used for both ON UPDATE and ON DELETE.
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The size of a data item is called its _______, which can be a field of some record or may be a larger unit such as a record.
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In multiple granularity of locks SIX lock is compatible with
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Employees in a company are each assigned their own office, i.e. for each employee there exists a unique office and for each office there exists a unique employee; This statement is an example of ____ type of relation.
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Which of the following is not a consequence of concurrent operations?
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______is a preferred method for enforcing data integrity
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Precedence graphs help to find a
A. Serializable schedule.
C. Deadlock free schedule.
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Relational Algebra is
A. Data Definition Language .
C. Procedural query Language