Understand the Informix Dynamic Server B-tree scanner 
(Srinath Duvuru and Mirav Kapadia) The B-tree scanner is a feature of IBM Informix Dynamic Server (IDS) that cleans dirty index items and compresses B-tree leaf pages. In this article, you'll gain a better understanding of how the B-tree scanner works and learn techniques for leveraging this feature to achieve optimum transaction processing performance.
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