Find the violate constraint rows in your Oracle DB.

1) Find the violate constraint rows in your Oracle DB.
As we known, "enable validate", "enable" for new values, "validate" for old values to
make constraints work. If you Oracle DB default option is enable and novalidate, then
you want to modify to enable and validate so that make all data confirm some constraints
. Unfortunatly, may you find some data real violate constraints, however, you could not
find where it is. So following method could help you.
It is not a big deal, I just write it down to a shell script.

1@@@@ Here, I write a shell scirpt to make it work
    [oracle@station78 ~]$ cat ./check_violate_constraint_rows.sh
    #!/bin/sh
    #please intput $1 table_name, $2 constraint_name
    read -p "Please input table name (like hr.employees): " tab
    read -p "Please input constraint name(like chk_xxx):  " cons
    sqlplus / as sysdba<< EOF > violate_constraint_rows.txt
    DROP TABLE exceptions PURGE;
    @\$ORACLE_HOME/rdbms/admin/utlexpt1.sql
    ALTER TABLE $tab ENABLE VALIDATE CONSTRAINT $cons EXCEPTIONS INTO EXCEPTIONS;
    SELECT * FROM $tab WHERE ROWID IN (SELECT row_id FROM exceptions);
    EOF
    echo " "
    echo "You could check the output file violate_constraint_rows.txt !!! "
    echo "Find the violate constraint rows, and do something."
    echo " "

@@@Usage Example
  [oracle@station78 ~]$ ./check_violate_constraint_rows.sh
  Please input table name (like hr.employees): test.t_trainsupport_executions
  Please input constraint name(like chk_xxx):  CHK_TRAINSUPPORT_EXEC_CUSTFAC
  
  You could check the output file violate_constraint_rows.txt !!!
  Find the violate constraint rows, and do something.
  
  [oracle@station78 ~]$ cat violate_constraint_rows.txt
  SQL*Plus: Release 10.2.0.1.0 - Production on Mon Dec 31 15:15:05 2012
  Copyright (c) 1982, 2005, Oracle.  All rights reserved.
  Connected to:
  Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
  With the Partitioning, OLAP and Data Mining options
  SYS@ocm>
  Table dropped.
 
  SYS@ocm>
  Table created.
 
  SYS@ocm>
  Table altered.
 
  SYS@ocm>
  no rows selected
 
  SYS@ocm> Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
  With the Partitioning, OLAP and Data Mining options



2@@@@ Here I write a sql script to make it work.
SYS@ocm> !cat x.sql
    DROP TABLE exceptions PURGE;
    @\$ORACLE_HOME/rdbms/admin/utlexpt1.sql
    ALTER TABLE &&table_name
    ENABLE VALIDATE CONSTRAINT &constraint_name
    EXCEPTIONS INTO EXCEPTIONS;
    SELECT * FROM &table_name WHERE ROWID IN (SELECT row_id FROM exceptions);

@@@Usage Example:
  SYS@ocm> @x.sql
  Table dropped.
  Table created.
 
  Enter value for table_name: test.t_trainsupport_executions
  old   1: ALTER TABLE &&table_name
  new   1: ALTER TABLE test.t_trainsupport_executions
  Enter value for constraint_name: CHK_TRAINSUPPORT_EXEC_CUSTFAC
  old   2: ENABLE VALIDATE CONSTRAINT &constraint_name
  new   2: ENABLE VALIDATE CONSTRAINT CHK_TRAINSUPPORT_EXEC_CUSTFAC
 
  Table altered.
 
  old   1: SELECT * FROM &table_name WHERE ROWID IN (SELECT row_id FROM exceptions)
  new   1: SELECT * FROM test.t_trainsupport_executions WHERE ROWID IN (SELECT row_id FROM exceptions)
 
  no rows selected