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Dbms schema & instance
The DBMS schema defines the overall logical structure and description of a database. A sub-schema allows different personalized views of the same underlying data. A DBMS instance refers to the specific set of data stored in a database at a particular moment in time.
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DBMS Schema is the overall logical representation of a database, detailing its structure. Example illustrates a user table with roles and ages.
Sub-schema creates distinct user views of the same data. Offers personalized perspectives, enhancing user experience with tailored data representations.
DBMS Instance is the data in the database at a specific time. Records vary; e.g., 50 records on 1/1/2019 and 300 on 1/2/2019.
Dbms schema & instance
- 1. DBMS Schema andInstance
- 2. DBMS Schema andInstance DBMS Schema :- The overall description of the database is called DBMS Schema. OR The Logical representation of database is called DBMS Schema. RDBM S Roll Name Age 11 Papan 18 SQL Example :
- 3. DBMS Schema andInstance DBMS Sub- Schema :- Sub-schema is used to create very different and personalized view of the Same data. DBMS Schema Sub-Schema Sub-Schema User-1 User-2 User-3 Roll Name Age 11 Papan 18 Name Papan Example :
- 4. DBMS Schema andInstance DBMS Instance :- The data stored in a database at a particular moment is called Instance of the database. Date : 1/1/2019 Student Table : Records = 50 Date : 1/2/2019 Student Table : Records = 300