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What are the drawbacks of File Oriented System in details?
why three level architecture had been developed/
define lock conversion
Describe the definition of a transaction in SQL Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and st
Databases and data warehouses both are databases and both contains number of rows and columns of tables containing data. Data warehouse is really different from databases because d
Exclusive lock It is asked for by a transaction on a data item that it wants to update. No other transaction can put either a shared lock or an exclusive lock on a dat
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.
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
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