Data dictionary:

A data dictionary is an essential part of database.

It holds the data about the data that means metadata.

The data dictionary is active and combined in most DBMSs.

It means that the DBMS check the data dictionary whenever the database is accessed or updated.

Types of information stored in a data dictionary:

Details of each database tables such as their owners, their security constraints and when they were generated the tables.

Data dictionary is used to store the information about the relations which are as follows:

Relation name.

Names and types of attributes of given relation.

Domain and length of attributes.

Names and definitions of database views.

Data about the integrity constraints such as primary key constraints, foreign key constraints etc.

Data dictionary is also used to store the data about the system users which are as follows:

Names of legal users...

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Chapter 7 Solutions

A Guide to SQL

Ch. 7 - What is a view?Ch. 7 - Which command creates a view?Ch. 7 - Prob. 3RQ Ch. 7 - What happens when a user retrieves data from a...Ch. 7 - What are three advantages of using views?Ch. 7 - Which command deletes a view?Ch. 7 - Prob. 8RQ Ch. 7 - Which command terminates previously granted...Ch. 7 - Prob. 10RQ Ch. 7 - How do you create an index? How do you create a...

Ch. 7 - Prob. 12RQ Ch. 7 - Does the DBMS or the user make the choice of which...Ch. 7 - Describe the information the DBMS maintains in the...Ch. 7 - The CUSTOMER table contains a foreign key,...Ch. 7 - Prob. 16RQ Ch. 7 - Prob. 17RQ Ch. 7 - Prob. 18RQ Ch. 7 - Prob. 19RQ Ch. 7 - When would you usually specify primary key...Ch. 7 - Prob. 21RQ Ch. 7 - Prob. 22RQ Ch. 7 - Prob. 23RQ Ch. 7 - Use SQL to make the following changes to the TAL...Ch. 7 - Create a view named ITEM_ORDER. It consists of the...Ch. 7 - Create a view named ORDER_TOTAL. It consists of...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5TD Ch. 7 - Perform the following tasks: a. Create an index...Ch. 7 - Delete the index named ITEM_INDEX3.Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9TD Ch. 7 - Prob. 10TD Ch. 7 - Toys Galore currently has a credit limit of 7,500....Ch. 7 - Use SQL to make the following changes to the...Ch. 7 - Create a view named RESERVATION_CUSTOMER. It...Ch. 7 - Create a view named TRIP_INVENTORY. It consists of...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5CAT Ch. 7 - Create the following indexes: a. Create an index...Ch. 7 - Prob. 7CAT Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9CAT Ch. 7 - Ensure that the only legal values for the TYPE...Ch. 7 - Prob. 11CAT Ch. 7 - Use SQL to make the following changes to the...Ch. 7 - Create a view named CONDO_OWNERS. It consists of...Ch. 7 - Create a view named CONDO_FEES. It consists of two...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5SCG Ch. 7 - Prob. 6SCG Ch. 7 - Delete the OWNER_INDEX 3 index from the OWNER...Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9SCG Ch. 7 - Ensure that the only legal values for the BDRMS...Ch. 7 - Prob. 11SCG

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Solution Summary: The author explains that a data dictionary is an essential part of database. It holds data about the data that means metadata.

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