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what is meant semantic query optimization? how does it differ from other query optimization techniques?
Describe the responsibilities of the DBA and the database designer ? The responsibilities of DBA and database designer are: 1. Planning for the database's future storage needs
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
Limitations of File Based System The file-based system has some limitations. The limitations are listed as follows: Isolation and separation of data: When the data is
Where does view definition stored? A view definition is permanently stored as part of the database.
This constraint shows that the key attribute value in each tuple must be unique, i.e., no two tuples have the similar value for the key attribute. This is because the value of the
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
What is system log? What are the entries? Ans: The system log that is generally written on stable storage contains the redundant data required to recover from volatile
what is cascading? what is rollback cascading? please explain in detail
What is the meaning of Data Independence ?
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