SECONDARY INDEX Meaning and
Definition
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A secondary index, also known as a non-clustered index, is a data structure that enhances the performance of database systems by providing quick access to specific fields or attributes that are not part of the primary index. Unlike the primary index, which is usually created on the primary key, a secondary index is created on a non-key field.
In a database, a secondary index is designed to facilitate efficient searching and retrieval of data. It works by creating a separate index structure that consists of values from the specified field and a pointer to the corresponding record or row in the main table. This allows the database management system (DBMS) to locate and access data more rapidly, as it does not need to scan the entirety of the primary index.
Secondary indexes are particularly useful when dealing with large databases and complex queries, as they reduce the IO (input/output) operations required to locate specific records. They can significantly speed up operations like searching, sorting, and joining tables. However, it's worth noting that secondary indexes may also introduce some overhead during data modification operations like insert, update, or delete, as the index needs to be maintained to ensure accuracy and consistency.
Furthermore, multiple secondary indexes can be created on different fields of a table, allowing users to compose complex queries involving various criteria. This flexibility in data access makes secondary indexes an indispensable feature in database systems, improving query performance and enhancing the overall efficiency of information retrieval.
Common Misspellings for SECONDARY INDEX
- aecondary index
- zecondary index
- xecondary index
- decondary index
- eecondary index
- wecondary index
- swcondary index
- sscondary index
- sdcondary index
- srcondary index
- s4condary index
- s3condary index
- sexondary index
- sevondary index
- sefondary index
- sedondary index
- secindary index
- seckndary index
- seclndary index
- secpndary index
Etymology of SECONDARY INDEX
The term "secondary index" is derived from the combination of two words: "secondary" and "index".
The term "secondary" comes from the Latin word "secundarius", meaning "next in order" or "subordinate". It refers to something that is second in importance or rank, existing in a supplemental or supporting role.
The term "index" originates from the Latin word "indicare", meaning "to point out" or "to show". An index is a systematic arrangement or list that provides references or pointers to specific information or objects.
When combined, "secondary index" refers to an additional or subordinate index that provides a different way of organizing and accessing information, typically used in databases. It acts as a complement to the primary index, allowing for more efficient searching and retrieval of data based on different criteria.
