compatible index constraint [计] 兼容索引约束
index-constraint 下标制约
Constraint index 短板指标
Active constraint index set 有效约束指标集
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。
When a primary key constraint is defined, the federated system automatically creates a unique index specification.
当定义一个主键约束时，联邦系统自动创建一个惟一的索引规范。
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。
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