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A typical characteristic of fields suitable for indexing is that they are often fixed length fields. This characteristic is beneficial because fixed-length fields allow for quicker access and easier storage since fixed-length data structures enable efficient use of disk space and minimize the overhead of searching through variable-length entries. When indexing is performed on fixed-length fields, the underlying data structure can be optimized for quick lookups, which enhances performance in retrieval operations.

In contrast, long fields with high variability present challenges for indexing; they can introduce complexity and inefficiencies due to their inconsistent sizes and formats. Binary fields, while they can be indexed, often necessitate specific handling or optimization techniques that can complicate the indexing process. Fields that are rarely accessed do not benefit much from indexing, since there would be less need for the performance improvements that indexing provides.