December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2012 Unleashed
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The CI Record
The CI record is the only main structural change to a page when it is page compressed versus a page that uses row compression only. As shown in the previous examples, the CI record is located immediately after the page header. There is no entry for the CI record in the row offset table because its location is always the same. A bit is set in the page header to indicate whether the page is page compressed. When this bit is present, SQL Server knows to look for the CI record. The CI record contains the data elements shown in Table 30.7.
TABLE 30.7 Data Elements Within the CI Record