IBM 000-8697 Uživatelský manuál stáhnout pdf (Strana 225)

System Architecture 2-131

Data Pages and Data Row Storage

If the leading segment cannot ﬁt into the current location of the row on the

home page, OnLine divides the page into whole-page segments again, this

time beginning with the leading end of the row. OnLine stores only a

forwarding pointer in the current page location. The rest of the data row is

stored in whole-page segments on one or more big-remainder pages.

Forward pointers are added to each page. The trailing portion of the row is

storedonaremainderpage.Figure 2-31illustratesstorageofanupdatedrow

that is longer than a whole page.

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IBM 000-8697 Uživatelský manuál Strana 225