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Indexed databases are databases that use an index data structure to efficiently retrieve and access data. The index stores keys and pointers to the actual data, allowing for faster search and retrieval of information. Indexes help in optimizing performance by reducing the number of disk accesses needed to locate specific data.
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What is a indexed sequential file?
An indexed sequential file is a type of file organization where data records are stored sequentially in the order of key values. An index is maintained to help locate records quickly. This combination of sequential storage and indexing allows for efficient access to data in both sequential and random access patterns.
What is a database that holds a duplicate set of frequently used data?
A cache database is a storage mechanism that holds a duplicate set of frequently used data in a way that allows for faster retrieval times. This helps to reduce the need to fetch data from the original source, improving the overall performance of applications and systems.
What data fields are required in indexing?
The specific data fields required for indexing can vary depending on the indexing system being used. However, some common data fields that are typically required include document title, document content, author or creator, date created or published, and keywords or tags. These data fields help organize and retrieve the indexed information effectively.
In reference to search utilities what does an index do?
An index in search utilities helps to organize and retrieve information quickly by creating a reference of keywords and their corresponding locations within the data. This speeds up search operations as the system can directly navigate to the indexed keywords instead of having to scan through the entire dataset.
Discuss the main characteristics of the database approach and how it differs from traditional file system?
Databases store electronic representations of data, but traditional file systems generally store paper with data written on it. In a traditional file system a file folder is the the way records are grouped, but in a database records are indexed in many ways, both by "file folder" and by record or data field. With relational database approaches relationships can be established between data in records and new records can be created from crossing files and even databases.
