Table of Contents
Which property of a DBMS allows you to change the database structure without requiring you to change the programs that access the database?
Summary. Data Independence is the property of DBMS that helps you to change the Database schema at one level of a database system without requiring to change the schema at the next higher level.
Which database property lets you change the structure of the database?
A good DBMS provides integrity constraints, which are features that let you change the structure of the database without changing the programs that access the database.
How do I change the structure of a database?
You can change the database structure with an ALTER query. The basic format for this query is ALTER TABLE tablename, followed by the specified changes. Table 3-7 shows the changes that you can make. Adds a column; definition includes the data type and optional definitions.
What structure is used to set up a database?
A database table consists of rows and columns. In database terminology, each row is called a record, object or entity. Each column is called a field or attribute. Database management systems (DBMS) are used to work with large databases.
Which of these are considered as properties of a database?
Database systems are designed to meet a set of properties known as ACID. Atomicity, Consistency, Isolation, and Durability are the properties that constitute ACID.
What are the properties of the relational database model?
Relational databases have the following properties:
- Values are atomic.
- All of the values in a column have the same data type.
- Each row is unique.
- The sequence of columns is insignificant.
- The sequence of rows is insignificant.
- Each column has a unique name.
How do you modify data in a database?
To modify data involves changing the contents of tables.
- Modify data in your database.
- Delete rows.
- Insert rows.
- Update rows.
- Privileges on a database and on its objects.
- Data integrity.
- Interrupted modifications.
- Backups and logs with IBM Informix database servers.
Which property determines the fields and records available to a report?
The record source of a report determines which fields from your database can be displayed on the report. In a relational database, related data is usually spread out across multiple tables. For example, information about customers is stored in one table, and information about orders is stored in another table.
Who changes the structure of database?
Myriad tasks require the DBA to modify and migrate database structures. One daunting challenge is to keep test databases synchronized and available for application program testing. The DBA must develop robust procedures for creating new test environments by duplicating a master testing structure.
Why would you change the appearance of a database?
Changing the theme of the database is a more consistent way of changing the appearance of the database this will not only make the database more uniform, but will also make it more synced with your Office Project.
What is structure in database?
Database structure: the building blocks of a database Within a database, related data are grouped into tables, each of which consists of rows (also called tuples) and columns, like a spreadsheet.
What is the data structure of a database?
Data Structure refers to the actual implementation of the data type and offers a way of storing data in an efficient manner. Data Structure is an outcome of application of certain tools and techniques used to connect data items within records and between records of the same file or of different files.