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SQL Anywhere 10.0.1 » SQL Anywhere Server - SQL Usage » Query Optimization and Execution » Query execution algorithms » Table access algorithms

Index scans Next Page

Parallel index scans

Parallel Index Scan operators work together under an exchange operator to do an index scan in parallel. As each Parallel Index Scan operator requires rows, it takes the next unprocessed leaf page and returns rows from the page, one at a time. In this way, pages are divided between the operators to achieve parallel processing. Regardless of how the pages are distributed among the Parallel Index Scan operators, all of the rows are visited.