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Automated system for appointment with sms and call confirmation with service providers and user has to be initiate automatically. After selecting time and date to use service, s
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.
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
What is Trigger? A trigger is a SQL procedure that initiates an action when an event (INSERT, DELETE or UPDATE) occurs. Triggers are kept in and managed by the DBMS. Triggers a
OBJECTIVES After going through this unit you should be capable to: Explain the File Based system and its limitations; Explain the structure of DBMS; Explain the
how does Btree differ from a B+ - tree?
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
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 is average response time? The average response time is that the average time for a transaction to be done after it has been submitted.
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