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SQL Data Page Storage

Posted on 2011-09-15
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Last Modified: 2012-05-12
Reading through a book (SQL 2008) to increase my SQL knowledge in hopes of moving towards a DBA role and had a question.  The book states "Data pages contain data rows from tables. These rows cannot span pages. Because of the page header and row offset information, the maximum row size is limited to 8,060 bytes."

Is the row they are refering to an entire row in a table because it seems like a single row could easily be larger than 8060 bytes?  Or can a Data Page row be just a single column value with a table row spanning mutliple Data Pages?  If not what happens when a table row is larger than 8,060 bytes?

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Question by:tim_cs
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pivar earned 2000 total points
ID: 36546308
Hi,

No, a row can store maximum 8060 bytes. But you could use a blob, that is, datatypes VARCHAR(MAX), NVARCHAR(MAX) and VARBINARY(MAX). They have a maximum size of 2GB, but add only 16 bytes to the 8060 bytes limit.

If you define a table with more than 8060 bytes, you will get an error.  You could define a table with varying length (varchars for instead) more than 8060 byte, but as soon as you exceed 8060 bytes of real data you will get an error.

/peter
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by:tim_cs
ID: 36548814
Ok, Thank You!!!
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