Question
What is a characteristic feature of a dense index in a
database indexing system?Solution
A dense index is a type of index where there is a one-to-one correspondence between index entries and actual data entries in the indexed column. In other words, for every key value in the data file, there is a corresponding entry in the index. Key characteristics of a dense index include: • Complete Coverage: Every value of the indexed field in the data file is represented in the index. This means that if a value appears multiple times in the data file, there will be an index entry for each occurrence. • Direct Access: Since each value in the data file has an associated index entry, it allows for direct access to the data records. This can make searches and retrievals very efficient because the index provides a quick way to locate any specific record.
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