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DECLARE X NUMBER;
BEGIN
  SYS.DBMS_JOB.SUBMIT
  ( job       => X
   ,what      => 'compile_invalid_object;'
   ,next_date => to_date('20-04-2010 17:13:33','dd/mm/yyyy hh24:mi:ss')
   ,interval  => 'trunc(SYSDATE)+23/24+1 '
   ,no_parse  => FALSE
  );
  --SYS.DBMS_OUTPUT.PUT_LINE('Job Number is: ' || to_char(x));
COMMIT;
END;


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15. /*+USE_CONCAT*/
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select /*+use_concat */ * from emp where deptno=10 OR empno=7788;
Execution Plan
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   0      S ......

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create table Table1(
StationID    NUMBER(10) Primary key,
Year           NUMBER(4)  not null,
Month        NUMBER(2)  n ......

Oracle waits event:DB File Sequential Read

The DB File Sequential Read wait event generally indicates a single block read (an index read,
for example). A large number could indicate poor joining orders of tables or unselective indexing.
This number will certainly be large (normally) for a high-transaction, well-tuned system. You ......

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