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Spotlight on SAP ASE 2.12 - User Guide

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Async Writes

The number of times that an asynchronous page cleaner or a prefetcher wrote a data or index page from the buffer pool to a tablespace. (A prefetcher can write dirty pages to disk to make space for the pages being prefetched.)

Pages cleaners and prefetchers perform asynchronous writes before a query needs buffer pool space¾thus avoiding the stop to query processing that occurs when the database manager must write pages to disk.

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