OPT_PARAM

  • From: LS Cheng <exriscer@xxxxxxxxx>
  • To: Oracle Mailinglist <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 24 Nov 2009 08:14:31 +0100

Hi

Does anyone know if opt_param hint works with optimizer_features_enable in
11.1.0.7?

I am testing it and it seems that it gets ignored

enable event 10132

SELECT
/*+ opt_param('optimizer_features_enable', '9.2.0')  */
x, y, z
 FROM v_lsc
WHERE x = 'S' OR y_date > to_date(:V1, 'MM/DD/YY HH24:MI:SS');

Content of other_xml column
===========================
  db_version     : 11.1.0.7
  parse_schema   : SIMO
  plan_hash      : 2064770634
  plan_hash_2    : 1803173905
Peeked Binds
============
  Bind variable information
    position=1
    datatype(code)=1
    datatype(string)=VARCHAR2(32)
    char set id=31
    char format=1
    max length=32
    value=11/20/09 14:01:27
  Outline Data:
  /*+
    BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
*      OPTIMIZER_FEATURES_ENABLE('9.2.0')*
..............
Optimizer state dump:
..............
*optimizer_features_enable           = 11.1.0.7*


Although in outline section it sees 9.2.0 optimizer afterwards it still uses
11.1.0.7


Thanks

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