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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Updating Rows

SQL Server 2008 performs row updates by evaluating the number of rows affected, whether the rows are being accessed via a scan or index retrieval and whether any index keys are being modified, and automatically chooses the appropriate and most efficient update strategy for the rows affected. SQL Server can perform two types of update strategies:

In-place updates

Not-in-place updates

In-Place Updates

In SQL Server 2008, in-place updates are performed as often as possible to minimize the overhead of an update. An in-place update means that the row is modified where it is on the page, and only the affected bytes are changed.

When an in-place update is performed, in addition to the reduced overhead in the table itself, only a ...

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Publisher Resources

ISBN: 9780768696585Purchase book