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PHYSICAL DBMS ARCHITECTURE
The physical architecture defines the software components used to process and enter data, and how these software components are related and interconnected. Though it is not possible to simplify the component structure of a DBMS, it is possible to recognize a number of key functions which are similar to most database management systems. The components that normally execute these functions are shown in Figure , which depicts the physical architecture of a typical DBMS.
Figure: DBMS Structure
Based on many functions, the database system may be partitioned into the following modules. Some functions (for example, file systems) may be given by the operating system.
Before we talk about the relational model in more detail, let us first define some very basic terms used in this model. Tuple Every row in a table shows a record and is cal
Differentiate between a Global and a Local temporary table? - A local temporary table exists only for the duration of a connection or if defined inside a compound statement, fo
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
Timestamp Ordering Protocol A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item
Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
What is an ERD?
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
Describe Specialsation and generalization? Specialisation /generalization: This is a top down and bottom up approach to the design of database. It displays the IS_A relation
Create centralized relational database using Top down method- Construction of Logical Model: Translation EERD into Relational Schema: Use the 8 steps algorithm of converting EERD
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