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What does data dictionary is a special file contains ?
The data dictionary is a special file contain The name of all fields in all files.The width of all fields in all files and The data type of all fields in all files.
What is meant by heuristic optimisation? Discuss the main heuristics that are applied during query optimisation. Ans: In heuristic optimization, heuristics are employed to r
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
File Manager File manager handles the allocation of space on disk storage. It starts and maintains the list of structures and indices described in the internal schema that is
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
external and internal mapping with examples
Draw the database using the ER approach and then make the tables accordingly. Populate the tables so that every table have at least 10 tuples. Then using Java and SQL, execute the
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
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