Related Questions
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Precedence graphs help to find a
A. Serializable schedule.
C. Deadlock free schedule.
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In SQL the word natural can be used with
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What is a disjoint less constraint?
A. It requires that an entity belongs to no more than one level entity set.
B. The same entity may belong to more than one level.
C. The database must contain an unmatched foreign key value.
D. An entity can be joined with another entity in the same level entity set.
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4
The normal form that is not necessarily dependency preserving is
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Given the following relation S(SNO,SNAME,CITY) write a query to update the value of CITY to KANPUR for the supplier S1.
A. UPDATE S CITY = KANPUR WHERE SNO=S1
B. UPDATE S SET CITY = KANPUR FOR SNO=S1
C. UPDATE S SET CITY = KANPUR WHERE SNO=S1
D. UPDATE S RENAME CITY = KANPUR WHERE SNO=S1
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A table can have only one
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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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The common column is eliminated in
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The middleware databases in which the business rules act are applicable to _______ tier architectures
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In multiple granularity of locks SIX lock is compatible with
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Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum and minimum size of the join respectively are
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Shadow paging has
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If both the functional dependencies : X�Y and Y�X hold for two attributes X and Y then the relationship between X and Y is
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A relation is in attribute of other composite key. if an attribute of a composite key is dependent on an
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Relations produced from an E-R model will always be
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______ keyword is used to find the number of values in a column.
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A list consists of last names, first names, addresses and pin codes. If all people in the list have the same last name and same pin code a useful key would be
C. the compound key first name and last name
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As per equivalence rules for query transformation, selection operation distributes over
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Immediate database modification technique uses
D. Neither undo nor redo.
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A _____ is a logical unit of database processing that includes one or more data access operations that can include insertion, deletion, modification or retrieval operations.
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In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :
A. Operationally, if Y is deleted, so is X
B. existence is dependent on Y.
C. Operationally, if X is deleted, so is Y.
D. Operationally, if X is deleted, & remains the same.
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The concept of mapping of ______ entity types is the concept in which the for each strong entity type E in the ER schema, create a relation R that includes all the simple attributes of E.
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In SQL, testing whether a subquery is empty is done using
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The _______ is a set of programs to use and / or modify this data.
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E-R Modeling is achieved by using ____ diagrams
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By ______ an area on disk in certain ways, one can make it represent a bit value of either zero (0) or one (1).
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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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Between DRAM and magnetic disk storage another form of memory, called ______ memory is becoming common because it is non volatile.
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Which of the following is not a property of transactions?
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A transaction is in state after the final statement has been executed.