Hashing

Hashing refers to the conversion of a column's primary key value to a database page number on which the row will be stored. Retrieval operations that specify the key column value use the same hashing algorithm and can locate the row directly. Hashing provides fast retrieval for data that contains a unique key value.

Note that a hash value cannot be converted back to the original value.

Also see

• Hash function
• Hash join
• Hash partitioning

Glossary of Terms
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