Optimizer not use indexes even after giving the indication

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  I have the table named OPT_TEST in my database 11g R2.
  There is an index on the ename column of the table above.
  11g does not use this index when I ask above table on the basis of the ename column.
  
  SQL > select count (*) in the opt_test;
  
  COUNT (*)
  ----------
  851969
  
  SQL > select count (*) in the opt_test where ename = 'KING '.
  
  COUNT (*)
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  1 0 TABLE ACCESS FULL OPT_TEST 1365
  
  
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  user8916506 wrote:

  SQL> select count(distinct ename) from opt_test ;
  
  COUNT(DISTINCTENAME)
  --------------------
  14
  
  SQL> select ename,count(*) from opt_test  group by ename;
  
  ENAME        COUNT(*)
  ---------- ----------
  ALLEN           65536
  JONES           65536
  FORD            65536
  CLARK           65536
  MILLER          65536
  SMITH           65536
  WARD            65536
  MARTIN          65536
  SCOTT           65536
  TURNER          65536
  ADAMS           65536
  BLAKE           65536
  KING                1
  JAMES           65536
  
  14 rows selected.
  

  The answer is b - I thought of:
  You enabled Oracle to make a sample auto size, and he stopped on a very small sample because he thought that he had obtained a stable result. But he has never seen the line after line with KING. Therefore, when you query for KING oracle saw "not in the histogram. For versions of Oracle 10.2.0.3 beyond estimation is then "half the number of lines for the least popular value', which comes to 32 768.

  Concerning
  Jonathan Lewis

• SQL not using indexes at runtime, but by using the index in "explain plan".

  Hi all

  I am facing a problem here that I don't get to think.

  I have a SQL that makes a FULL ACCESS of TABLE into two tables and its costs are very high, but it occurs only when I run it in my program (I saw it in the session trace). If I do a "explain plan" sqlplus (SQL Navigator or PLSQL Developer) it shows that he use indexes and have a low cost. I already checked the statistics from both tables, and they are up to date.

  Did someone never facing a similar problem or knows something I can do to find my problem?

  Thank you all very much.

  Hello

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  ORACLE-BASE - DBMS_XPLAN: Oracle display execution Plans

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