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Describe Database state in details?
Database state: The actual data within the database at a particular moment in time is known as a database state.
what do you mean by consistency in rdbms?
What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o
Objectives Define the terms RECOVERY and INTEGRITY; Define Recovery Techniques; Explain Error and Error detection techniques, and Define types of Authorisation.
what is Mapping Constraints? with examples
why are older data models are being replaced by new data models
Define shadow paging. An alternative to log-based crash recovery method is shadow paging. This technique requires fewer disk accesses than do the log-based methods.
(a) Why did SAP introduce the extended star schema?
Write short notes on tuple relational calculus. The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particul
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
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