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## 02430-02449: Constraint Enabling & Disabling Messages

This section lists messages generated when commands are used that affect constraints on a table.

##### ORA-02430: cannot enable constraint name - no such constraint

Cause: The named constraint does not exist for this table.

Action: Check that a constraint exists before trying to enable it.

##### ORA-02431: cannot disable constraint name - no such constraint

Cause: The named constraint does not exist for this table.

Action: Check that a constraint exists before trying to disable it.

##### ORA-02432: cannot enable primary key - primary key not defined for table

Cause: An attempt was made to enable a primary key that is not defined for the table.

Action: Add a primary key definition for the table.

##### ORA-02433: cannot disable primary key - primary key not defined for table

Cause: An attempt was made to disable a primary key that is not defined for the table.

Action: Check that a primary key exists before trying to disable it.

##### ORA-02434: cannot enable unique(str) - unique key not defined for table

Cause: An attempt was made to enable a unique key that is not defined for the table.

Action: Check that a unique key exists before trying to enable it.

##### ORA-02435: cannot disable unique str - unique key not defined for table

Cause: An attempt was made to disable a unique key that is not defined for the table.

Action: Check that a unique key exists before trying to disable it.

##### ORA-02436: date or system variable wrongly specified in CHECK constraint

Cause: An attempt was made to use a date constant or system variable, such as USER, in a check constraint that was not completely specified in a CREATE TABLE or ALTER TABLE statement. For example, a date was specified without the century.

Action: Completely specify the date constant or system variable.

##### ORA-02437: cannot enable name - primary key violated

Cause: An attempt was made to enable a primary key constraint on a column that contains either duplicate values or null.

Action: Remove the duplicate values or null before enabling the primary key constraint.

  For more information about removing integrity constraints from columns, see the index entry on "integrity constraints, removing from columns" in Oracle8 Server SQL Reference.

##### ORA-02438: column check constraint cannot reference other columns

Cause: An attempt was made to define a column check constraint that references another column.

Action: This is not permitted for column check constraints. Create this constraint as a table check constraint.

##### ORA-02439: non-unique index exists on unique/primary key constraint

Cause: An attempt was made to enable a primary key or unique constraint on a column that has an existing non-unique index.

Action: Drop the non-unique index on the column or do not attempt to enable this constraint.

##### ORA-02440: create as select with referential constraints not allowed

Cause: Integrity constraints on a table cannot be created when creating the table using the CREATE TABLE... AS SELECT... form.

Action: First, create the table, and then alter the table to add the desired integrity constraints.

##### ORA-02441: cannot drop non-existent primary key

Cause: An attempt was made to drop the primary key constraint on a table, but there is no primary key constraint on this table.

Action: Ensure the correct table name is entered in the statement. Otherwise, no action required.

##### ORA-02442: cannot drop non-existent unique key

Cause: An attempt was made to drop a unique key constraint for a column that does not have a unique key constraint.

Action: Make certain the correct column name was entered. Otherwise, no action required.

##### ORA-02443: cannot drop constraint - non-existent constraint

Cause: An attempt was made to drop a constraint that does not exist.

Action: Make certain the constraint and table name are correct and attempt the procedure again.

##### ORA-02444: cannot resolve referenced object in referential constraints

Cause: An attempt was made to define a foreign key with a reference to a schema object that cannot be resolved to a base table reference.

Action: Define referential constraints only with schema objects resolving to a base table.

##### ORA-02445: exceptions table not found

Cause: The explicitly or implicitly declared exceptions table does not exist.

Action: If the correct exceptions table name was used, then create the table and retry the enable command.

##### ORA-02446: CREATE TABLE ... AS SELECT failed - check constraint violated

Cause: An attempt was made to use a CREATE TABLE... AS SELECT statement when some rows violated one or more CHECK constraints.

Action: Do not select rows that violate constraints.

##### ORA-02447: cannot defer a constraint that is not deferrable

Cause: An attempt was made to defer a nondeferrable constraint.

Action: Drop the constraint and create a new one that is deferrable.

##### ORA-02448: constraint does not exist

Cause: The named constraint does not exist.

Action: Stop trying to use a nonexistent constraint.

##### ORA-02449: unique/primary keys in table referenced by foreign keys

Cause: An attempt was made to drop a table with unique or primary keys referenced by foreign keys in another table.

Action: Before performing the above operations on the table, drop the foreign key constraints in other tables. You can see what constraints are referencing a table by issuing the following command: SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam";

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