Why the CBO will ignore my index?

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  The exception text *.
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  at System.Windows.Forms.Control.WmShowWindow (Message & m)
  at System.Windows.Forms.Control.WndProc (Message & m)
  at System.Windows.Forms.ScrollableControl.WndProc (Message & m)
  at System.Windows.Forms.Form.WmShowWindow (Message & m)
  at System.Windows.Forms.Form.WndProc (Message & m)
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  mscorlib
  Assembly version: 4.0.0.0
  Win32 Version: 4.0.30319.1008 (RTMGDR.030319 - 1000)
  Code: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
  ----------------------------------------
  WindowsFormsApplication1
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• When the CBO would not use bitmap indexes available?

  I have a large data warehouse table in a star schema classic, with an index number of bitmap for the dimension tables. When you run queries that contain parameters for multiple indexes, the CBO will only use generally one or rarely two bitmap index.

  It seems to me that if the indexes are valid, statistics, the values of the parameters are present, etc and the CBO uses a bitmap index in an AND condition, he would like to use all those she could.

  there all the parameters that affect or bitmap how indexes him CBO will use? I'm looking for some advice on what to look for or research.

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  rp0428 - who has been deliberate because my question is not "how to solve this problem", that's exactly what I pointed out in my post. Just trying to see if there are all the controls to weight the decision-making community organizations in this area.

  OK - then let me simply state it.

  No - there are NO these parameters. But most of the posters are not really looking for a simple yes/no answer even if of many word of questions like that.

  See my response as of March 18, 2012 19:21 in this thread: https://community.oracle.com/message/10219613?

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• Selectivity of the behavior of the CBO.

  Hi all
  
  This issue has been raised several times, but has found no reason on why optimizer chooses bad index.
  
  I would like to know on what basis optimizer thought or why the optimizer thought that bad index would be useful? Can be real mathematical approach will be useful...
  
  Imprecise plan:

  SQL> SELECT ERROR,TIME_STAMP,O_RESOURCE,QUEUE,NEW_QUEUE FROM AMRWF1.LOG WHERE ID = '09306AMR117E19B' AND TYPE IN (11, 28, 25, 18, 60, 13) AND (LOG_SEQ>'238565731' OR TYPE =18 AND LOG_SEQ='238565731') ORDER BY TIME_STAMP ASC
    2  /
  
  Execution Plan
  ----------------------------------------------------------
     0      SELECT STATEMENT Optimizer=CHOOSE (Cost=11 Card=2 Bytes=130)
     1    0   SORT (ORDER BY) (Cost=11 Card=2 Bytes=130)
     2    1     CONCATENATION
     3    2       TABLE ACCESS (BY INDEX ROWID) OF 'LOG' (Cost=4 Card=1
            Bytes=65)
  
     4    3         INDEX (UNIQUE SCAN) OF 'PK_LOG_LOG_SEQ' (UNIQUE) (Co
            st=3 Card=1)
  
     5    2       TABLE ACCESS (BY INDEX ROWID) OF 'LOG' (Cost=4 Card=1
            Bytes=65)
  
     6    5         INDEX (RANGE SCAN) OF 'PK_LOG_LOG_SEQ' (UNIQUE) (Cos
            t=3 Card=1)

  Specific plan:

  SQL> set autotrace traceonly exp
  SQL> SELECT /*+ index(log log_id) */ ERROR,TIME_STAMP,O_RESOURCE,QUEUE,NEW_QUEUE FROM AMRWF1.LOG WHERE ID = '09306AMR117E19B' AND TYPE IN (11, 28, 25, 18, 60, 13) AND (LOG_SEQ>'238565731' OR TYPE =18 AND LOG_SEQ='238565731') ORDER BY TIME_STAMP ASC
    2  /
  
  Execution Plan
  ----------------------------------------------------------
     0      SELECT STATEMENT Optimizer=CHOOSE (Cost=1522 Card=1 Bytes=65
            )
  
     1    0   SORT (ORDER BY) (Cost=1522 Card=1 Bytes=65)
     2    1     TABLE ACCESS (BY INDEX ROWID) OF 'LOG' (Cost=1518 Card=1
             Bytes=65)
  
     3    2       INDEX (RANGE SCAN) OF 'LOG_ID' (NON-UNIQUE) (Cost=27 C
            ard=1)

  Sometimes we get specific plan without reference:

  SQL> set autotrace traceonly exp
  SQL> SELECT ERROR,TIME_STAMP,O_RESOURCE,QUEUE,NEW_QUEUE FROM AMRWF1.LOG WHERE ID = '09303AMR6349C60' AND TYPE IN (11, 28, 25, 18, 60, 13) AND (LOG_SEQ>'232414396' OR TYPE =18 AND LOG_SEQ='232414396') ORDER BY TIME_STAMP ASC
    2  /
  
  Execution Plan
  ----------------------------------------------------------
     0      SELECT STATEMENT Optimizer=CHOOSE (Cost=1524 Card=287 Bytes=
            18655)
  
     1    0   SORT (ORDER BY) (Cost=1524 Card=287 Bytes=18655)
     2    1     TABLE ACCESS (BY INDEX ROWID) OF 'LOG' (Cost=1518 Card=2
            87 Bytes=18655)
  
     3    2       INDEX (RANGE SCAN) OF 'LOG_ID' (NON-UNIQUE) (Cost=27 C
            ard=287)

  A few details:

  SQL> select * from v$version;
  
  BANNER
  ----------------------------------------------------------------
  Oracle8i Enterprise Edition Release 8.1.6.3.0 - Production
  PL/SQL Release 8.1.6.3.0 - Production
  CORE    8.1.6.0.0       Production
  TNS for Solaris: Version 8.1.6.3.0 - Production
  NLSRTL Version 3.4.0.0.0 - Production
  
  SQL> select INDEX_NAME,INDEX_TYPE,BLEVEL,CLUSTERING_FACTOR,STATUS,NUM_ROWS,LAST_ANALYZED from dba_indexes where table_owner='AMRWF1' and TABLE_NAME='LOG';
  INDEX_NAME                     INDEX_TYPE                      BLEVEL CLUSTERING_FACTOR STATUS     NUM_ROWS LAST_ANAL
  ------------------------------ --------------------------- ---------- ----------------- -------- ---------- ---------
  PK_LOG_LOG_SEQ                 NORMAL                               2            374452 VALID     2495032.8 01-NOV-09
  LOG_ID                         NORMAL                               2           1491672 VALID       2616573 01-NOV-09
  
  
  SQL> select density,NUM_DISTINCT,low_value,high_value from dba_tab_columns where owner = 'AMRWF1' and table_name = 'LOG' and column_name in ('LOG_SEQ','ID');
     DENSITY NUM_DISTINCT LOW_VALUE                                HIGH_VALUE
  ---------- ------------ ---------------------------------------- ----------------------------------------------------------------
  2.9359E-07      3406141 C50309284434                             C50327231662
  .001113586          898 3037313635414D5231323842424530           3039333035414D5231313731344230

  Here, why even after having been low density on column ID... LOG_ID index is not used?
  
  Please let me know if you need more details.
  
  Earlier post links discussed on this same SQL statements...
  CBC latch and buffer busy await you on the same table.
  
  Re: Research of fragmentation of the table in Oracle 8.1.6.3.0
  
  -Yasser

  As I mentioned earlier, it is not the ID column but the log_seq column that causes the problem. You have histograms - but they have a size of a bucket.

  so in the stats for log_seq - you will have a low value and a high value.

  If for example the specified log_seq is greater than high value stored in the stats - so the optimizer will be expected back a few lines to the status log_seq >... and therefore make more attractive based log_seq index

  Published by: Lacotte Renaud on November 4, 2009 08:03

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