Click here to view and discuss this page in DocCommentXchange. In the future, you will be sent there automatically.

SQL Anywhere 11.0.1 » SQL Anywhere Server - SQL Usage » Query Processing » Query optimization and execution » Query execution algorithms » Table access methods

 

ParallelIndexScan method

When ParallelIndexScan is used, individual IndexScan operators work together under an Exchange operator to do an index scan in parallel. As each IndexScan 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 IndexScan operators to achieve parallel processing. Regardless of how the pages are distributed among the IndexScan operators, all the rows are visited.