What is a logical data structure?
A logical data model or logical schema is a data model of a specific problem domain expressed independently of a particular database management product or storage technology (physical data model) but in terms of data structures such as relational tables and columns, object-oriented classes, or XML tags.
What provides details about data?
A DBMS provides details about data. Metadata provides details about data. For example, metadata for an image could include its size, resolution, and date created. A data mart is the process of analyzing data to extract information not offered by the raw data alone.
What compiles all of the metadata about the data elements?
|Term Information granularity||Definition The extent of detail within the information (fine and detailed or coarse and abstract)|
|Term Metadata||Definition provides details about data|
|Term Data dictionary||Definition Compiles all of the metadata about the data elements in the data model|
Are the data elements associated with an entity?
the smallest or basic unit of information. stores information about a person, place, thing, transaction, or event. attributes. are the data elements associated with an entity.
What is logical level in database?
Conceptual Level It is also known as the logical level. It describes how the database appears to the users conceptually and the relationships between various data tables. The conceptual level does not care for how the data in the database is actually stored.
What is the difference between the logical and physical data structure?
A logical data model is a model that describes data as much as possible, without regard to how they will be physically implemented in the database. In contrast, a physical data model is a model that represents how the actual database is built.
What is data dictionary example?
19.11 Data Dictionary A data dictionary is a centralized repository of metadata. Metadata is data about data. Some examples of what might be contained in an organization’s data dictionary include: The data types, e.g., integer, real, character, and image of all fields in the organization’s databases.
What are the components of data dictionary?
Data dictionary contents can vary but typically include some or all of the following: A listing of data objects (names and definitions) Detailed properties of data elements ( data type, size, nullability, optionality, indexes) Entity-relationship (ER) and other system-level diagrams.
What is data dictionary in database?
A data dictionary is a file or a set of files that contains a database’s metadata. The data dictionary contains records about other objects in the database, such as data ownership, data relationships to other objects, and other data. Typically, only database administrators interact with the data dictionary.
What is the smallest or basic unit of data?
A: The smallest unit of measurement used for measuring data is a bit. A single bit can have a value of either 0 or 1. It may contain a binary value (such as On/Off or True/False), but nothing more. Therefore, a byte, or eight bits, is used as the fundamental unit of measurement for data.
What four elements are included in systems thinking?
This theory proposes that there are just four essential systems thinking skills: making distinctions, organizing systems, recognizing relationships, and taking multiple perspectives.
What is the smallest or basic unit of information?
Byte, the basic unit of information in computer storage and processing. A byte consists of 8 adjacent binary digits ( bits ), each of which consists of a 0 or 1. The string of bits making up a byte is processed as a unit by a computer; bytes are the smallest operable units of storage in computer technology.
What occurs if a name is spelled incorrectly in a data file?
What occurs if a name is spelled incorrectly in a data file? The data are inaccurate.
What are the two different categories for information type?
Description: Transactional information is a kind of information that a business unit contains. Analytical information is a kind of information which is used for making the tasks and decision for an organisation.
What kind of attribute would be age?
Two or more entities can have the same value for this attribute. For example, the Class attribute would have the same value for all those students who are studying in the same class. Example: Class, Section, Age, Name etc, are the non-key attributes. Note: The same attribute can be of more than one kind.