User views in a database are virtual tables that display specific data based on predetermined criteria set by the user. They allow users to access and manipulate data without directly interacting with the underlying database tables. In simpler terms, user views are like a fancy filter for data, making it easier for users to see only what they want to see.
The graphical user interface of the database.
dbms
The database catalog of a database instance consists of metadata in which definitions of database objects such as base tables, views (virtual tables), synonym, value ranges, indexes, users, and user groups are stored.The SQL standard specifies a uniform means to access the catalog, called the INFORMATION_SCHEMA, but not all database follow this, even if they implement other aspects of the SQL standard. For an example of database-specific metadata access methods, see Oracle metadata.
authentication
Subschema
the ---- of a database presents the views that the end user have
In DB2, a user is an individual who is granted permissions to access and interact with the database, while a schema is a named collection of tables, views, procedures, and other database objects owned by a user. Users are associated with schemas to define their default schema for objects they create.
A Database has three views. The External Schema: What the end user sees. The Internal Schema: What the programmers of the program see. The Conceptual Schema: The basic plan of the database. Most of the time this is in paper form as a Conceptual Schema Diagram (CSD)
Single-user database support only one user at a time
single-user database supports only one user at a time. In other words, if user A is using the database, users B and C must wait until user A is done. A single-user database that runs on a personal computer is called a desktop database.
The graphical user interface of the database.
In a database management system, data can be viewed in three main ways: Conceptual view: Represents the overall framework or structure of the entire database. External view: Shows a subset of the database and is tailored to meet individual user requirements. Physical view: Describes how data is stored on the physical storage media.
dbms
A user database is a system that more than 1 person can access and gain information from. Multiple users can input and store data in these database systems.
Single-user database support only one user at a time
Single-user database support only one user at a time
Database comes from the end user or the database users. Combining all the data database system is formed.