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What are the time stamps associated with each data item?
W-timestamp (Q) denotes the largest time stamp if any transaction that implemented WRITE (Q) successfully.
R-timestamp (Q) denotes the largest time stamp if any transaction that implemented READ (Q) successfully.
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
What are the advantages of creating a table from existing table?
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
Advantages of Observation Methods: Bailey has pointed out four advantages of observation: 1. Superior in Data Collection on Non Verbal Behavior: When a person a opi
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
Control as Concurrent Tasks The expression control as simultaneous task means applying control for those events of object which can happen simultaneously. An object can be imp
Define Fifth Normal form is concerned with Ans : Fifth Normal form is concerned with Join dependency.
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what is cascading? what is rollback cascading? please explain in detail
Explain the disadvantages of file oriented approach? In the oriented approach Applications are designed in isolation. Design of application is optimized for one application. In
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