November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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Chapter 2. Terminology and concepts 23
2.2.8 Pages
Data is transferred to and from devices in discrete blocks that are buffered in memory. These
discrete blocks are called pages, and the memory reserved to buffer a page transfer is called
an I/O buffer. DB2 UDB supports various page sizes including 4k, 8k, 16K and 32k.
When an application accesses data randomly, the page size determines the amount of data
transferred. In other words, it will correspond to the data transfer request size to ESS, which is
sometimes referred to as the physical record.
Sequential read patterns can also influence the page size selected. Larger page sizes for
workloads with sequential read patterns can enhance performance by reducing the number of
I/Os.
2.2.9 Extent ...
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