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erro na criação de index


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Boa noite

Tenho a seguinte tabela Utilizador e o index criado abaixo...

create table tb_utilizador


id_utilizador int primary key identity (1,1),

nome nvarchar(1000) not null,

morada nvarchar(1000) not null,

cod_postal nchar(8) not null,

localidade nvarchar(1000) not null,

telefone nvarchar(16) not null,

email nvarchar(1000),

bi_cidadao nvarchar(12) not null unique



create unique index idx_nome_utilizador on tb_utilizador(nome)

--pode ser unique ou clustered???

Estou a tentar criar o indice na tabela utilizaodor,campo nome, mas surge o seguinte erro:

Warning! The maximum key length is 900 bytes. The index 'idx_nome_utilizador' has maximum length of 2000 bytes. For some combination of large values, he insert/update operation will fail.

podem ajudar?

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