Are there any disadvantages to always using nvarchar(MAX)?

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Are there any disadvantages to always using nvarchar(MAX)?

valentinzxj

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#21

07-31-2023, 09:44 AM

My tests have shown that there are differences when selecting.

CREATE TABLE t4000 (a NVARCHAR(4000) NULL);

CREATE TABLE tmax (a NVARCHAR(MAX) NULL);

DECLARE @abc4 NVARCHAR(4000) = N'ABC';

INSERT INTO t4000
SELECT TOP 1000000 @abc4
FROM
master.sys.all_columns ac1,
master.sys.all_columns ac2;

DECLARE @abc NVARCHAR(MAX) = N'ABC';

INSERT INTO tmax
SELECT TOP 1000000 @abc
FROM
master.sys.all_columns ac1,
master.sys.all_columns ac2;

SET STATISTICS TIME ON;
SET STATISTICS IO ON;

SELECT * FROM dbo.t4000;
SELECT * FROM dbo.tmax;

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