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Explain current page table and shadow page table.
The key idea behind the shadow paging method is to maintain two page tables during the life of the transaction: the current page table and the shadow page table. Both the page tables are identical when the transaction begins. The current page table might be changed when a transaction performs a write operation.
Explain natural join? Natural Join - Similar as equi-join except in which the join attributes (having similar names) are not involved in the resulting relation. Only one sets
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
What is System R? What are its two major subsystems? System R was intended and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its pur
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
deffine class&object
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
What is the max. no. Of structures that can be included in a table or structure. Nine.
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