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What is DAG?
The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and permanent, of the class employee.
Discuss the mechanism to read data from and write to a disk? Disk read/write heads are mechanisms in which read data from or write data to disk drives. The heads have gone by
Explain concurrency control? Concurrency control Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read
define locking in simple language and decribed it
Australian Bureau of Statistics (ABS) provides retail data for different groups and different states as well as the aggregate numbers. Table 11 " Retail Turnover, State by Industry
There are three main sources of utilities and applications for a DBMS: a. Vendor applications and utilities are given for working with or maintaining the database, and generally
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What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Explain the components of Database System in details.
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
In which format database schema is written ? Data base schema is written in the DDL format.
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