IBM 000-8697 Uživatelský manuál stáhnout pdf (Strana 220)

2-126 IBM Informix OnLine Database Server Administrator’s Guide

Data Pages and Data Row Storage

Single-Page Storage

To minimize retrieval time, rows are not broken across page boundaries

unnecessarily. Rows that are shorter than a page are always stored as whole

rows. A page is considered full when the count of free bytes is less than the

number of bytes needed to store a row of maximum size. Figure 2-27 illus-

trates data storage when rows are less than a page.

Rows that are

shorter than a page

are stored as whole

Page header Complete data rows

TimestampSlot table entriesFree space

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IBM 000-8697 Uživatelský manuál Strana 220