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Explain how the object classes are mapped to tables.
Each object class maps to one or more than one tables in the database. The objects in the class may be partitioned horizontally or/and vertically. For instance, if class has many instances of which, a few are often referenced. In this case, horizontal partitioning may improve efficiency by placing the frequently accessed objects in a table, and the remaining objects in another tables. Similarly, if a class has attributes with different access patterns, it may help to partition the objects vertically.
What are stored-procedures? And what are the advantages of using them? Stored procedures are database objects that perform a user defined operation. A stored procedure can have
What is meant by mean time to failure? The mean time to failure is the amount of time that the system could run continuously without failure.
i am not clear with the climetic condition of the north indian plain. can u plz explain it for me
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List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
write-set(T): Each data items that are written by a transaction T
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Which are the two ways in which entities can participate in a relationship? Total and partial are the two ways in which entities can participate in a relationship
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