subschema

简明释义

英[/ˈsʌbˌskiːmə/]美[/ˈsʌbˌskiːmə/]

n. [计] 子模式

英英释义

单词用法

同义词

反义词

例句

1.Digraph will be constructed by using the dependence of the left of subset's FD. Some nodes will help to decompose a subschema of BCNF. The key of the subschema is the left or left's equivalence.

FD集中根据左部等价形成划分，划分的各子集根据左部的依赖关系形成一个有向图，有向图中每一个节点的FD可能是一个符合BCNF的子模式的FD，其关键字就是各子集的等价左部。

2.A data schema, especially a data subschema in a relational data system.

关系数据系统中的数据模式，特别是子模式。

3.A subschema is a description of only that portion of the database pertinent to a particular user's needs.

子模式仅仅是数据库中与一个特殊用户的需求相关的一部分的描述。

4.Digraph will be constructed by using the dependence of the left of subset's FD. Some nodes will help to decompose a subschema of BCNF. The key of the subschema is the left or left's equivalence.

FD集中根据左部等价形成划分，划分的各子集根据左部的依赖关系形成一个有向图，有向图中每一个节点的FD可能是一个符合BCNF的子模式的FD，其关键字就是各子集的等价左部。

5.A subschema 子模式 can help in optimizing queries by providing only the necessary fields.

一个subschema 子模式可以通过提供仅必要的字段来帮助优化查询。

6.In a database, each subschema 子模式 defines a specific view of the data for different users.

在数据库中，每个subschema 子模式为不同用户定义了数据的特定视图。

7.When designing a new feature, we decided to implement a subschema 子模式 to isolate changes.

在设计新功能时，我们决定实现一个subschema 子模式以隔离更改。

8.The application allows developers to create a subschema 子模式 for managing user permissions.

该应用程序允许开发者创建一个subschema 子模式来管理用户权限。

9.The system uses a subschema 子模式 to restrict access to sensitive information.

该系统使用subschema 子模式来限制对敏感信息的访问。

作文

In the field of computer science and database management, the term subschema refers to a subset of a database schema that defines a specific view or structure of the data. Understanding the concept of subschema is crucial for anyone involved in designing or managing databases, as it allows for greater flexibility and organization within complex data systems. A database schema serves as the blueprint for how data is organized, while a subschema provides a more focused perspective on a particular segment of that data.For instance, consider a large university database that contains information about students, courses, faculty, and departments. The overall database schema would include all these entities and their relationships. However, if a department only needs to access student information relevant to its courses, a subschema can be created. This subschema would define only the necessary attributes and relationships pertinent to that department, thus simplifying data retrieval and management.The use of subschemas is particularly beneficial in environments where multiple users or applications require different views of the same underlying data. By creating distinct subschemas, database administrators can ensure that each user has access only to the data they need, thus enhancing security and performance. For example, an academic advisor might have access to a subschema that includes student grades and course enrollments, while a financial officer might have a different subschema that focuses on tuition payments and financial aid.Moreover, subschemas can also facilitate the integration of different data sources. In many organizations, data is collected from various departments and systems. By defining subschemas that correspond to each source, it becomes easier to combine and analyze data across the organization. This approach not only streamlines data management but also enhances the ability to generate comprehensive reports and insights.It’s important to note that changes made to the main database schema can impact all associated subschemas. Therefore, careful planning and consideration are required when modifying the database structure. Database administrators must ensure that any alterations do not disrupt the functionality of the existing subschemas, which could lead to data inconsistencies or access issues.In conclusion, the concept of subschema is integral to effective database management. It allows for tailored views of data, enhances security by limiting access, and supports the integration of diverse data sources. As organizations continue to collect and manage vast amounts of information, understanding and utilizing subschemas will be essential for maintaining efficient and organized data systems. Whether you are a database administrator, a developer, or a data analyst, mastering the use of subschemas will undoubtedly enhance your capability to work with complex data structures and improve overall data governance.

在计算机科学和数据库管理领域，术语subschema指的是数据库模式的一个子集，定义了数据的特定视图或结构。理解subschema的概念对于任何参与数据库设计或管理的人来说都是至关重要的，因为它允许在复杂数据系统中实现更大的灵活性和组织性。数据库模式作为数据组织的蓝图，而subschema则提供了对该数据特定部分的更集中视角。例如，考虑一个大型大学数据库，其中包含有关学生、课程、教职员工和部门的信息。整体数据库模式将包括所有这些实体及其关系。然而，如果一个部门只需要访问与其课程相关的学生信息，则可以创建一个subschema。这个subschema将仅定义与该部门相关的必要属性和关系，从而简化数据检索和管理。使用subschema在多个用户或应用程序需要对同一底层数据的不同视图的环境中特别有益。通过创建不同的subschema，数据库管理员可以确保每个用户仅访问他们所需的数据，从而增强安全性和性能。例如，学术顾问可能会访问一个包含学生成绩和课程注册的subschema，而财务官员可能会有一个不同的subschema，重点关注学费支付和经济援助。此外，subschema还可以促进不同数据源的集成。在许多组织中，数据是从各个部门和系统收集的。通过定义与每个来源相对应的subschema，跨组织组合和分析数据变得更加容易。这种方法不仅简化了数据管理，还增强了生成全面报告和洞察的能力。需要注意的是，对主数据库模式所做的更改可能会影响所有相关的subschema。因此，在修改数据库结构时需要仔细规划和考虑。数据库管理员必须确保任何更改不会干扰现有subschema的功能，这可能导致数据不一致或访问问题。总之，subschema的概念对于有效的数据库管理至关重要。它允许数据的量身定制视图，通过限制访问增强安全性，并支持多样化数据源的集成。随着组织继续收集和管理大量信息，理解和利用subschema将对维护高效和有组织的数据系统至关重要。无论您是数据库管理员、开发人员还是数据分析师，掌握subschema的使用无疑将增强您处理复杂数据结构的能力并改善整体数据治理。