Hash Access / Scan

Card Puncher Data Processing


A hash scan is used to locate rows in a hash cluster, based on a hash value. In a hash cluster, all rows with the same hash value are stored in the same data block. To perform a hash scan, Oracle first obtains the hash value by applying a hash function to a cluster key value specified by the statement. Oracle then scans the data blocks containing rows with that hash value.

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Oracle Database Sql Processing
SQL Engine - (Access|Scan) (Paths|Method)

Access paths are relational operator (ways, techniques) that retrieves data from the database. scan In general, index access paths should be used for statements that retrieve a small subset of table...

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