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Program data dependence refers to the coupling of data stored in files and the specific programs required to update and maintain those files such that changes in programs require changes to the data. In a tradition file environment, any change in a software program could require a change in the data accessed by that program.
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∙ 14y ago
Program data dependence refers to the relationships between data elements in a program that determine the order of computation execution. There are different types of data dependencies, such as read-after-write (RAW), write-after-read (WAR), and write-after-write (WAW) dependencies. Understanding and managing data dependence is crucial for optimizing program performance and ensuring correct execution.
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Difference between data dependence and data independence?
Data dependence refers to how one task's output is reliant on another task's input, while data independence means a program can be changed without altering the data access methods. Data dependence reflects tight coupling between tasks, while data independence allows for greater flexibility and ease of maintenance in software development.
What is information dependence?
Information dependence refers to the reliance on specific information or data in order to make decisions or judgments. Individuals, organizations, or systems may be reliant on certain sources of information to function effectively. This dependence can result in vulnerability if the information source is compromised or inaccurate.
What is the scope of a data statement?
The scope of a data statement refers to where in the program the data is accessible. It defines the visibility and accessibility of the data within a program, determining which parts of the program can access and manipulate the data. Properly scoping data helps in managing data effectively and preventing unintended side effects.
What is program data Independence?
Program data independence refers to the ability to change the data structures and organization within a database without affecting the application programs that use the data. This allows developers to modify data structures without having to rewrite or change the application code, promoting flexibility and ease of maintenance in database systems.
What is data dependency?
It is like a dependent variable it is just a variable alone.
What cause program-data dependence?
Program-data dependence arises when the result of a program execution depends on the specific data inputs provided to the program. This can occur in algorithms that involve processing and manipulating data, where the outcome varies based on the input data. It is crucial to understand and manage program-data dependencies to ensure the correctness and reliability of the program.
Difference between data dependence and data independence?
Data dependence refers to how one task's output is reliant on another task's input, while data independence means a program can be changed without altering the data access methods. Data dependence reflects tight coupling between tasks, while data independence allows for greater flexibility and ease of maintenance in software development.
What is system dependence graph?
A program's system dependence graph (SDG) is a collection of procedure dependence graphs (PDGs): one for each procedure.
What are the problems of managing data in a traditional file environment?
•Data redundancyDifferent systems/programs have separate copies of the same data •Program-data dependence All programs maintain metadata for each file they use •Lack of flexibility Programmers must design their own file formats •Poor security, lack of data-sharing and availability No centralized control of data •Excessive Program Maintenance 80% of of information systems budget
What is the difference between data dependency and structural dependency?
Structural dependence-Access to a file depends on its structure i.e. adding customer date-of-birth field to customer file require the five steps described in slide 29. the reason for this is that the file structure is coded within the programData dependence-Changes in database structure affect program's ability to access data i.e. changing field from integer to decimal required changes in all the files. the reason for this is that the file data characteristics are coded within the program.
What are least three conditions that contribute to data redundancy and inconsistency?
Lack of data normalization where data is stored in multiple locations, leading to redundant copies. Poor data quality control processes that result in inconsistent data entries. Inadequate data integration procedures that fail to synchronize data across different systems, causing redundancy and inconsistencies.
What are the limitations of a file-based approach?
* Separation and isolation of data * Duplication of data * Data dependence * Incompatibility of files * Fixed queries / proliferation of application programs
What are the Problems of traditional file processing?
Program-Data Dependence. File descriptions are stored within each application program that accesses a given file.Duplication of Data. Applications are developed independently in file processing systems leading to unplanned duplicate files. Duplication is wasteful as it requires additional storage space and changes in one file must be made manually in all files. This also results in loss of data integrity. It is also possible that the same data item may have different names in different files, or the same name may be used for different data items in different files.Limited data sharing. Each application has its own private files with little opportunity to share data outside their own applications. A requested report may require data from several incompatible files in separate systems.Lengthy Development Times. There is little opportunity to leverage previous development efforts. Each new application requires the developer to start from scratch by designing new file formats and descriptionsExcessive Program Maintenance. The preceding factors create a heavy program maintenance load.Integrity Problem. The problem of integrity is the problem of ensuring that the data in the database is accentuate.
What is information dependence?
Information dependence refers to the reliance on specific information or data in order to make decisions or judgments. Individuals, organizations, or systems may be reliant on certain sources of information to function effectively. This dependence can result in vulnerability if the information source is compromised or inaccurate.
What is the scope of a data statement?
The scope of a data statement refers to where in the program the data is accessible. It defines the visibility and accessibility of the data within a program, determining which parts of the program can access and manipulate the data. Properly scoping data helps in managing data effectively and preventing unintended side effects.
RAM holds data and program for processing data?
RAM is volatile storage that holds the program and data that the CPU would be processing.
What is data adapter?
you can get data from dababase to your program memory by data adapter.
