instance and schema in DBMS between DB instance and database schema (schema)

Record only, Original:

https://beginnersbook.com/2015/04/instance-and-schema-in-dbms/
Instance and schema in DBMS

by Chaitanya SINGH | FILED Under:dbms

Definition of Schema:design of a database is called the schema. Schema is of three types:physical schema, logical schema and view schema.

The design of a database at physical level was called physical schema, how the data stored in blocks of storage are describe D at the level.

Design of database at logical level is called logical schema, programmers and database administrators At this level data can is described as certain types of data records gets stored in data structures, however the internal Details such as implementation of data structure are hidden at the This level (available at physical level).

Design of database at view called View schema. This generally describes end user interaction with database systems.

To learn more on these schemas, refer 3 level Data Abstraction architecture.

Definition of instance:the data stored in database at a particular moment for time is called instance of database. Database schema defines the variable declarations in tables, belong to a particular database; The value of these variables at a moment of time are called the instance of that database. enjoyed this post? Try These related posts candidate Key in DBMS normalization in DBMS:1NF, 2NF, 3NF and BCNF in Database Data models I N DBMS hierarchical model in DBMS Composite key in DBMS DBMS languages