SQL Server：如何使服务器检查其所有检查约束？

SQL Server: How to make server check all its check constraints?

似乎由EnterpriseManager*生成的一些脚本(或者不重要)使用nocheck创建了检查约束。

现在，当任何人修改表时，SQL Server都会遇到失败的检查约束，并抛出错误。

我可以让SQL遍历所有的检查约束并检查它们吗？

运行：

1	sp_msforeachtable 'ALTER TABLE ? CHECK CONSTRAINT all'

只启用以前禁用的检查约束，而不实际检查它们。

脚注

*SQL Server 2000

带有所有约束的DBCC CHECKCONSTRAINTS实际上不会使您的约束可信。它将报告任何违反约束的行。要使所有约束都可信，可以执行以下操作：

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DBCC CHECKCONSTRAINTS WITH ALL_CONSTRAINTS --This reports any data that violates constraints.

--This reports all constraints that are not trusted
SELECT OBJECT_NAME(parent_object_id) AS table_name, name, is_disabled
FROM sys.check_constraints
WHERE is_not_trusted = 1
UNION ALL
SELECT OBJECT_NAME(parent_object_id) AS table_name, name, is_disabled
FROM sys.foreign_keys
WHERE is_not_trusted = 1
ORDER BY table_name

在SQL Server 2000中，可以找到任何不受信任的约束：

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--Reports all constraints that are not trusted (SQL 2000)
SELECT name, type, status,
(status & 2048) AS IsTrusted,
(status & 256) AS IsEnabled,
OBJECTPROPERTY(id,'CnstIsNotTrusted') as is_not_trusted,
OBJECTPROPERTY(id,'CnstIsDisabled') as is_disabled
FROM sysobjects
WHERE type IN ('C', 'F') --C=Constraint, F=Foreign Key
AND OBJECTPROPERTY(id,'CnstIsNotTrusted') <> 0
AND OBJECTPROPERTY(id,'CnstIsDisabled') = 0

然后通过检查重新启用约束：

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--This makes all constraints trusted
-- but first anything reported by DBCC CHECKCONSTRAINTS WITH ALL_CONSTRAINTS must be fixed.
exec sp_msforeachtable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all'

注：在最后一条语句中，WITH CHECK CHECK不是拼写错误。"WITH CHECK"将检查所有表数据以确保没有冲突，并将使约束可信，而检查将确保启用约束。

参见：http://sqlbog.com/blogs/tibor_karaszi/archive/2008/01/12/non-trusted-constraints.aspx

http://sqlbog.com/blogs/tibor_karaszi/archive/2008/01/12/non-trusted-constraints-and-performance.aspx

找到它：

检查当前数据库中所有表上的所有约束，无论是否启用该约束：

1	DBCC CHECKCONSTRAINTS WITH ALL_CONSTRAINTS

要仅检查启用的约束：

1	DBCC CHECKCONSTRAINTS

这样做：

1 2	ALTER TABLE dbo.Test WITH CHECK CHECK CONSTRAINT CK_Test;

解释：你能相信你的约束吗？