Which of the following statements is true about systems information in an RDBMS?

Understanding Information Systems in RDBMS

The correct answer to the quiz question is "All of the above." This emphasizes the fact that every statement provided in the options holds true when discussing information systems in an RDBMS, or Relational Database Management System.

An RDBMS works using the model of relational databases, where data is structured in database tables. Each table is a collection of related data entries and it consists of numerous columns and rows.

RDBMS Stores Database Definition in System-Created Tables

In an RDBMS, system-created tables are used to store database definition information. These tables, often known as system tables, include relevant metadata about the database. Metadata can include various types of information such as table names, column names, data types of a column, and other pertinent table attributes. For instance, when creating a new table within an Oracle database, a row is added to the system table 'USER_TABLES', storing helpful information about the new creation.

Accessing Information with SQL

SQL, or Structured Query Language, is a programming language that helps in communicating with databases. SQL is used to access, manipulate, and perform operations on the data stored in a relational database. This applies to system information as well. Therefore, the statement that "Such information can be accessed with SQL," is undoubtedly valid. SQL commands such as SELECT, INSERT, UPDATE, DELETE, ALTER, and DROP can be used to retrieve and modify database information. For instance, to retrieve table information one could use a SELECT statement querying the system databases.

Limited User Alteration Capabilities

Normally, the information stored in system tables does not allow for routine alteration or updating by end-users. This information is often maintained and updated by the system itself to ensure data consistency and integrity. Protection of this data is critical since modification could lead to severe database issues, including serious data integrity concerns. Thus, the "information cannot be updated by the user" statement is correct under most circumstances.

To sum up, understanding the nuances of how and where an RDBMS stores information, how it can be accessed, and who can manipulate it offers a greater grasp of database management concepts. It highlights the importance of SQL in working with databases and the critical nature of maintaining the integrity of system-created tables.

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