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What is E-R model?
This data model is based on real world that having of basic objects called entities and of relationship between these objects. Entities are explained in a database by a set of attributes.
Define Two phase commit Two phase commit: To make sure atomicity, all the sites where a transaction is being executed must agree on the final outcome of the execution. The tran
how many types of data model in DBMS? explain data abstraction with its different level
What are composite attributes? Composite attributes can be separated in to sub parts.
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
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.
Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
Which is a valid SQL type? A valid SQL Should be in CHARACTER it is should be NUMERIC and FLOAT.
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