In a federated database,

Question

BlackTom AI · Accepted Answer

When approaching the concept of a federated database, it’s helpful to think about how data is distributed across multiple systems. 
Option 1 suggests that tables are split by row or column and kept in separate databases. While fragmentation by rows or columns can exist in distributed setups, the hallmark of a federated database is not simply splitting tables, but rather permitting autonomous databases to contribute to a global query without centralizing all data. This makes this option misleading as a complete definition.
Option 2 states that segments of the whole data are kept in different locations. This is closer to the idea of distribution, but the term 'segments' is vague and does not specifically capture the federated model, which emphasizes independent databases contributing to a unified schema and queries rather than just arbitrary segments.
Option 3 claims that one piece of software cannot manage all of the distributed data. While management challenges are real in federated systems, this statement describes a difficulty rather than defining the Federated Database Architecture itself. It omits the core idea that multiple autonomous databases participate under a federated framework.
Option 4 asserts that data for different parts of a database are kept in different databases. This aligns with the standard definition of a federated database, where multiple distinct databases collaborate to present a combined, global view while preserving local autonomy and management of each participating database.
Overall, the key concept is the distribution of data across independent databases that work together under a federated scheme, rather than a simple physical segmentation or a management limitation. This makes Option 4 the most accurate description among the choices.

In a federated database,单项选择题

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