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The pictorial representation of a conceptual data model is called a(n): database entity diagram. relationship systems design entity relationship diagram, database model D Which is not true of indexes? An index is a table containing the key and the address of the records that contain that key value. Indexes are used to improve performance for information retrieval. It is typical that an index would be created for the primary key of each table. Creating any index changes the order in which records are plysically stored on secondary storage:

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Answer 1

A pictorial representation of a conceptual data model is called a(n): entity relationship diagram (ERD).ERD is an important tool used to represent the data stored in databases in a graphical form.

They are a visual representation of the relationships among tables in a database and are often used in database design. An ERD consists of entities, attributes, and relationships between entities which are represented using various symbols.

Indexes are used to improve performance for information retrieval. When a database is queried to retrieve data, the query runs on the indexes first rather than scanning the entire table. Creating any index changes the order in which records are plysically stored on secondary storage is not true of indexes. An index is not a table containing the key and the address of the records that contain that key value.Indexes are created for columns that are frequently used in queries, such as foreign key columns and columns that contain frequently searched values. It is typical that an index would be created for the primary key of each table, but this is not always necessary.

An index can be created for any column that is frequently used in queries and can significantly improve the performance of the query.

An index does not change the order of records in a table physically. It only provides a way to retrieve data faster.

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