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Spotlight on Oracle 10.9 - Getting Started Guide

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Table Access Paths

The following table shows some of the common table access paths you may encounter while using the Explain SQL window.

Operation Option Description

TABLE ACCESS

FULL

The well-known full table scan. This involves reading every row in the table (that is, every block up to the high water mark).

TABLE ACCESS

CLUSTER

Access of data via an index cluster key.

TABLE ACCESS

HASH

Using a hash key to access one or more rows in a table with a matching hash value.

TABLE ACCESS

BY ROWID

Access a single row in a table by specifying its ROWID. ROWID access is the fastest way to access a single row. Often the ROWID is obtained by an associated index lookup.

 

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