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Maximum row size in SQLServer
flyinsky · 2004-11-01 · via 博客园 - flyinsky

When I execute the command below

CREATE TABLE [CST_SAY3] (
 [BAS_ID] [int],
 [PRO_DETAIL] [Nvarchar] (4000) ,
 [REMARK] [Nvarchar] (3000)
) ON [PRIMARY]
GO

It will make a warning

Warning: The table 'CST_SAY3' has been created
but its maximum row size (14029) exceeds the maximum number
of bytes per row (8060).
INSERT or UPDATE of a row in this table will fail if the
resulting row length exceeds 8060 bytes.

Although I know the reason (In Microsoft® SQL Server™, the maximum allowable size of a row in a table is 8060 bytes. A row cannot be split across data pages. A data page is 8 KB in size and consists of the data row and some internal data structures.)  , I don't know why the maximum row size is
14029, a field is Nvarchar(4000), the bytes is 8000, another field is Nvarchar(3000), the bytes is 6000,
the last field is int , why it's bytes is 29?
 Can someone give me the answer, thanks.