ORA-02331: cannot create constraint on column of datatype string
Answer / guest
Cause: An attempt was made to create a constraint on a
column posessing a non-constrainable datatype -- VARRAY,
nested table, object, LOB, FILE, or REF.
Action: Change the column datatype, or remove the constraint.
Please add more information about this Error
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NID-00501: ----------------------------------------------------
ORA-01241: an external cache has died