Microsoft KB Archive/75277

= INF: How DATALENGTH Determines the Length of Text Fields =

Article ID: 75277

Article Last Modified on 2/14/2005

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APPLIES TO


 * Microsoft SQL Server 4.21a Standard Edition

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This article was previously published under Q75277



The DATALENGTH function does not need to traverse the entire text page chain to determine how long the text field is, because the length is stored on the first page in the chain. Therefore, although SQL Server must de-reference the pointer stored in the row on the data page to determine the location of the text page, then read the text page, the overhead is small.

Additional query words: de-reference Windows NT dblib

Keywords: kbprogramming KB75277

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