and managing the database that forms a complete system named DBMS(database management system). Data refers to all the single items that are stored in the database. It needs to be secure and managed in this way so that only authenticated persons can use it and can make changes or store...
In the data dictionary, the columns will be turned “sideways”, making them into rows in the data dictionary spreadsheet. The precise tables that the data dictionary is made of may depend on the DBMS (Database Management System). The data dictionary linchpin is the document that contains all...
Ans. Data Redundancy happens when the same data exists in more than one place. It’s fixed by organizing the data better to avoid repeats and ensure the data is correct and consistent. 25. Name the XML configuration files present in Hadoop. ...
(2) data sharing: the data in the database is considered for the data requirements of all users and is oriented to the whole system. The data used by different users can overlap, and the same part of data can be shared by multiple users. (3) reduce data redundancy: only one data ...
Minimizing data redundancy improves database consistency, enhances storage, and promotes data integrity. Promote Data IntegrityData integrity refers to the overall accuracy, consistency, and completeness of data stored in a database. A DBMS runs tests to check errors and validate data. This helps ...
Code Reusability:OODBs support inheritance, allowing objects to inherit properties and methods from parent objects or classes. This promotes code reuse and reduces redundancy, as common functionalities can be defined in a superclass and inherited by subclasses. Code reusability enhances development product...
Data redundancy and inconsistency. 存储信息的文件和应用往往是由不同程序员分别开发维护的,且时间跨度较长,不同文件之间很有可能存在冗余信息或者不一致的数据。 Difficulty in accessing data. 数据分散在不同的文件,如果需要查询特定的数据,需要通过应用程序,一旦有现有应用程序不能满足的查询需求,就需要编码拓展应用...
Data base management system (DBMS) represent the management of data which includes various processes like collection of related data , storing and retrieving them, using set of programs for easy and effective manner. While it may sound quit simple and easy but in reality it is not. As the bu...
The motivation for using databases rather than files has been greater availability to a diverse set of users, integration of data for easier access and update for complex transactions, and less redundancy of data. A database management system (DBMS) is a generalized software system for ...
This schema offers the advantage of low levels of data redundancy but is not as effective when it comes to query performance. 雪花模式由一个连接到多个维度表的事实表组成,这些维度表可以通过多对一关系连接到其他维度表。这种模式提供了低级别数据冗余的优势,但在查询性能方面没有那么有效。 As the name...