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An internal data schema is the structure or blueprint that defines how data is organized and stored within a database system or application. It typically includes details such as data types, relationships between different data elements, and rules for data validation and storage. Having a well-defined internal data schema is essential for ensuring data integrity, efficiency, and consistency in data processing.
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Why logical data independence is more difficult than physical data independence?
Logical data independence is considered more difficult than physical data independence because it involves changes to the conceptual schema and external schema, which are more closely tied to the way data is organized and viewed in the application. Physical data independence, on the other hand, deals with changes to the internal schema, which is more abstract and can be modified with less impact on the overall system.
2.5 What is the difference between logical data independence and physical data independence?
The logical data independence is the ability to modify a logical schema without making external view or application program change. The physical data independence is the ability to modify a physical schema without making external view or application prrogram change.
What is logical data independence and why is it important?
Logical data independence refers to the key feature of database management system that helps maintain data integrity and the overall effectiveness of the data usage. It is very important as it allows for the modification of the conceptual schema without disturbing the external schema.
What is the use of XML schema?
XML schema is used to define the structure, content, and data types within an XML document. It helps enforce rules for validating data in XML files, ensuring that they conform to a specific format. By using XML schema, developers can establish standards for data exchange and communication between different systems.
What is a document that describes database objects and their data types?
A data dictionary is a document that describes database objects such as tables, columns, and their corresponding data types. It provides information about the structure, relationships, and constraints of the database schema.
How are the internal external and conceptual schemas related to concept of logical and physical data independence?
The internal schema represents the physical storage structure of data, the external schema represents how different users view the data, and the conceptual schema defines the logical structure of the entire database. Logical data independence means that the conceptual schema can change without affecting the external schemas, while physical data independence means that changes in the physical storage structures do not affect the conceptual or external schemas.
What is schema and sub-schema?
The schema is the physical arrangement of the data as it appears in the DBMS. The subschema is the logical view of the data as it appears to the application program.
What is sub schema?
The schema is the physical arrangement of the data as it appears in the DBMS. The sub-schema is the logical view of the data as it appears to the application program.
Difference between schema sub schema and instance in DBMS in detail?
the overall logical data base description is referred to as a schema. it is sometimes also referred to as an overall modal of the data, a conceptual modal of the data, a conceptual schema
Discuss the basic differences between external schema conceptual schema and internal schema?
The internal schema describes how the data will be physically stored and accessed, using the facilities provided by a particular DBMS. For example, the data might be organized so that all the insurance policies belonging to a given customer were stored close together, allowing them all to be retrieved into the computer's memory in a single operation. The conceptual schema (sometimes called the logical schema) describes the stored data in terms of the data model of the DBMS. In a relational DBMS, the conceptual schema describes all relations that are stored in the database The external schemasspecify views that enable different users of the data to see it in different ways. As a simple example, some users of policy data might not require details of the commission paid. By providing them with a view that excludes the Commission Rate column, we would not only shield them from unwanted (and perhaps unauthorized) information, but also insulate them from changes that might be made to the format of that data.by:mohammed abu Lamdy
What are the key components and principles of schema in computer science?
In computer science, schema refers to the structure and organization of data. The key components of schema include data types, relationships between data elements, and constraints on data values. The principles of schema design involve ensuring data integrity, efficiency in data storage and retrieval, and flexibility to accommodate changes in data requirements.
What is difference between Schema and Subschema?
SCHEMA is the physical arrangement of the data as it appears in the DBMS. SUB-SCHEMA is the logical view of the data as it appears to the application program.
What Logical data independence and physical data?
Logical data independence refers to the ability to modify the conceptual schema without changing the external schemas or application programs. In contrast, physical data independence allows changes to the internal schema – like indexes and storage structures – without affecting the conceptual or external schemas.
What is external schema?
The role of the external schema is to support user views of data and thus to provide programmers with easier data access
What is the examples of three levels of schema?
Schemas can be classified into three levels: physical schema, logical schema, and view schema. The physical schema refers to the actual storage of data on hardware, detailing how data is stored in files and disks. The logical schema defines the structure of the database in terms of tables and relationships, abstracting away the physical details. Lastly, the view schema presents how data is seen and interacted with by users, often representing a subset or specific aspect of the logical schema tailored for particular applications or user roles.
What data is independent?
Data independence is the ability to change the schema at one level of the database system without having to change the schema at the other levels.
Why logical data independence is more difficult than physical data independence?
Logical data independence is considered more difficult than physical data independence because it involves changes to the conceptual schema and external schema, which are more closely tied to the way data is organized and viewed in the application. Physical data independence, on the other hand, deals with changes to the internal schema, which is more abstract and can be modified with less impact on the overall system.
