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Define Cascading rollback
The phenomenon where a single transaction failure leads to a series of transaction rollbacks is known as Cascading rollback.
What is disadvantage of multiple inheritances? There is potential ambiguity if the similar variable or method can be inherited from more than one superclass.eg: student class m
Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
Consider the relation schemas as follows. works (person name, company name, salary); lives (person name, street, city); located in(company name, city); managers (person name
What is Disadvantages Of DBMS ? 1. Cost of Software and Hardware and Migration - A important disadvantage of the DBMS system is cost. 2. Reduced Response and Throughpu
I need some help with my normalization database homework.
Define what Immediate database modification technique uses? Ans: Both undo and redo.
What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
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