Active constraint index set 有效约束指标集
index constraint [计] 下标约束
compatible index constraint [计] 兼容索引约束
index-constraint 下标制约
There is no option to disable index support for an existing constraint.
对于一个现存约束，要禁用索引支持没有别的选择。
As discussed earlier, this processing could take such forms as index maintenance, constraint verification, or trigger execution.
前面已经讨论过，这种处理可能以不同的形式出现，例如索引维护、约束验证或者触发器执行。
When the constraint creation is complete, the index supporting the constraint is disabled and its space is dropped.
当约束创建完成后，禁用支持约束的索引，空间被释放。
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