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Recovery Techniques:After Reading the types of failures and database errors, let us talk about how to recover from the failures. Recovery can be complete using/restoring the previous consistent state (backward recovery) or by moving forward to the next consistent state as per the committed transactions recovery (forward recovery). Please note that a system can recover from software and hardware failures by using the forward and backward recovery only if the system log is intact. What is the system log? We will talk about it in more detail, but first let us describe forward and backward recovery.
lock and types of lock
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
Single Valued Normalisation Codd in the year 1972 formed three normal forms (1NF, 2NF, and 3NF). These were based on functional dependencies between the attributes of a relati
complete er diagram of textile industry management
A set of possible data values is called? A set of possible data values is called as domain.
List some instances of collection types? a) sets b) arrays c) multisets
Define Hash files organization a. Hashing includes computing the address of a data item by calculating a function on the search key value. b. A hash function h is a functi
Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
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