ORA-14196: Specified index cannot be used to enforce the constraint. (Doc ID 2740943.1)

Last updated on JULY 20, 2024

Applies to:

Symptoms

When attempting to create a unique constraint using an index that was created with a function(Function-based index), an ORA-14196: Specified index cannot be used to enforce the constraint is raised

alter table test_con add constraint test_con_u1 unique(c4) using index idx1 enable novalidate;

ERROR at line 1:
ORA-14196: Specified index cannot be used to enforce the constraint.und

Changes

 created a function-based index on the column being used in the constraint

Cause

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