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What is transaction?
Collections of operations that form a single logical unit of work are known as transactions.
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
can you create a database for me in oracle/sql
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.
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
1. A company wants a report containing a breakdown of payroll by department. Input, which should be stored in 3 parallel arrays, includes each employee's department number, hourly
We have a buildup of payments that need to be processed. You will need:- To prepare customer account on our site Process payment (you must have working Paypal account to d
Explain what is Aggregation ? Aggregation: This is used whenever we intend to show a relationship between an entity and the relationship. There is no provision for this in th
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