cardinality better for predicate is null

I'm using Oracle 11.2.0.3.   I have a request similar to that below. It is estimated that the cardinality is 3 times out of the real.  I tried to create extended statistics, but it's not helping.

Extended statistics cannot be used on columns of handling sucks?

Is it possible to improve the cardinality for this case.

I created random data in tmp.

col1 can take the values 1 and 2.

Col 2 can take the values 1 and 2.

COL3 is date and it's null especially when col1 = 1 and col2 = 1

I want to get the good estimation of query (select * from tmp where col1 = 1 and col2 = 1 and col3 is null)


drop table tmp;

create table tmp ( col1 number, col2 number, col3 date);

insert  into tmp
select 1 ,1 ,sysdate from dual
union all
select 1, 2, sysdate  from dual
union all
select 1 ,1 ,NUll  from dual
union all
select 1, 1, NULL  from dual
union all
select 1, 1, sysdate  from dual
union all
select 2, 2, sysdate  from dual
union all
select 1, 1, NULL  from dual

exec DBMS_STATS.GATHER_TABLE_STATS( user, 'TMP' , method_opt => 'FOR ALL COLUMNS ');

select  count(*) from tmp where col1=1 and col2 =1 and col3 is null ; 
-- gives 3 estimate is only 1

Plan hash value: 3231217655
----------------------------------------------------------------------------
| Id  | Operation          | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time   |
----------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |      |        |       |     4 (100)|          |
|   1 |  SORT AGGREGATE    |      |      1 |    11 |            |          |
|*  2 |   TABLE ACCESS FULL| TMP  |      1 |    11 |     4   (0)| 00:00:01 |
----------------------------------------------------------------------------


select dbms_stats.CREATE_EXTENDED_STATS ( user, 'TMP','(col1,col2,col3)') from dual;


exec DBMS_STATS.GATHER_TABLE_STATS(user, 'TMP', method_opt => 'for columns (col1,col2,col3) ' , degree=> 16 , estimate_percent => null);


select  count(*) from tmp where col1=1 and col2 =1 and col3 is null;
-- gives 3 estimate is only 1

I have just published a modified version of your example with few details of support for how the column group seems to be ignored if one of the underlying columns has a predicate "sucks": https://jonathanlewis.wordpress.com/2015/11/05/column-groups/

Concerning

Jonathan Lewis

Tags: Database

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|  13 |              BITMAP AND                     |                             |      1 |        |       |            |          |      4 |00:00:00.14 |     615 |       |       |          |
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|  15 |                BITMAP CONVERSION FROM ROWIDS|                             |      1 |        |       |            |          |      2 |00:00:00.02 |      69 |       |       |          |
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|  17 |                BITMAP CONVERSION FROM ROWIDS|                             |      1 |        |       |            |          |      4 |00:00:00.05 |     207 |       |       |          |
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|  19 |               BITMAP CONVERSION FROM ROWIDS |                             |      1 |        |       |            |          |      5 |00:00:00.06 |     339 |       |       |          |
|* 20 |                INDEX RANGE SCAN             | XIF910DSCLR                 |      1 |    274K|       |    67   (0)| 00:00:01 |    239K|00:00:00.04 |     339 |       |       |          |
|  21 |            NESTED LOOPS                     |                             |      1 |        |       |            |          |  21749 |00:00:00.10 |   17278 |       |       |          |
|  22 |             NESTED LOOPS                    |                             |      1 |   3404 |   339K|  1965   (1)| 00:00:28 |  22772 |00:00:00.03 |    1246 |       |       |          |
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|* 24 |              INDEX RANGE SCAN               | XIE2OCRN                    |   3255 |      7 |       |     1   (0)| 00:00:01 |  22772 |00:00:00.03 |    1219 |       |       |          |
|* 25 |             TABLE ACCESS BY INDEX ROWID     | OCRN                        |  22772 |      1 |    21 |     1   (0)| 00:00:01 |  21749 |00:00:00.06 |   16032 |       |       |          |
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|  27 |            WINDOW BUFFER                    |                             |  30646 |      1 |    21 |     1   (0)| 00:00:01 |  46946 |00:00:00.59 |     101K|  2048 |  2048 | 2048  (0)|
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|* 29 |              INDEX RANGE SCAN               | XIE1DSCLR_FLNG              |  30646 |      2 |       |     1   (0)| 00:00:01 |  46946 |00:00:00.21 |   59862 |       |       |          |
|* 30 |          INDEX RANGE SCAN                   | XPKH760_RGLTY_ACTN_DSCLR    |  30553 |      1 |       |     1   (0)| 00:00:01 |  30553 |00:00:00.18 |   57541 |       |       |          |
|  31 |         TABLE ACCESS BY INDEX ROWID         | H760_RGLTY_ACTN_DSCLR       |  30553 |      1 |   748 |     1   (0)| 00:00:01 |  30553 |00:00:00.11 |   26218 |       |       |          |
|  32 |        TABLE ACCESS FULL                    | DSCLR_ST_TYPE_TBL           |      1 |      4 |    64 |     4   (0)| 00:00:01 |      4 |00:00:00.01 |       5 |       |       |          |
|  33 |       TABLE ACCESS FULL                     | RGLTY_RSLTN_TYPE_TBL        |      1 |     12 |   312 |     7   (0)| 00:00:01 |     12 |00:00:00.01 |      10 |       |       |          |
|  34 |      TABLE ACCESS FULL                      | INTTR_TYPE_TBL              |      1 |     14 |   406 |     7   (0)| 00:00:01 |     14 |00:00:00.01 |      10 |       |       |          |
|  35 |     TABLE ACCESS FULL                       | SNCTN_TYPE_TBL              |      1 |     15 |   315 |     7   (0)| 00:00:01 |     15 |00:00:00.01 |      10 |       |       |          |
|  36 |    TABLE ACCESS FULL                        | PRDCT_TYPE_TBL              |      1 |     25 |   725 |     4   (0)| 00:00:01 |     25 |00:00:00.01 |       5 |       |       |          |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------

   1 - SEL$A8B7A3F4
  11 - SEL$A8B7A3F4 / D@SEL$13
  23 - SEL$A8B7A3F4 / OH@SEL$1
  24 - SEL$A8B7A3F4 / O@SEL$13
  25 - SEL$A8B7A3F4 / O@SEL$13
  26 - SEL$13512960 / DF@SEL$13
  27 - SEL$13512960
  28 - SEL$13512960 / DF1@SEL$14
  29 - SEL$13512960 / DF1@SEL$14
  30 - SEL$A8B7A3F4 / H7@SEL$2
  31 - SEL$A8B7A3F4 / H7@SEL$2
  32 - SEL$A8B7A3F4 / DS@SEL$9
  33 - SEL$A8B7A3F4 / RST@SEL$11
  34 - SEL$A8B7A3F4 / ITT@SEL$3
  35 - SEL$A8B7A3F4 / ST@SEL$5
  36 - SEL$A8B7A3F4 / PT@SEL$7

Outline Data
-------------

  /*+
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('11.2.0.3')
      DB_VERSION('11.2.0.3')
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      MERGE(@"SEL$3FAACB6D")
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      MERGE(@"SEL$9")
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      OUTLINE(@"SEL$9")
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      OUTLINE(@"SEL$171BE69E")
      MERGE(@"SEL$AF02BF1E")
      OUTLINE(@"SEL$3")
      OUTLINE(@"SEL$2")
      OUTLINE(@"SEL$AF02BF1E")
      MERGE(@"SEL$13")
      OUTLINE(@"SEL$1")
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      FULL(@"SEL$A8B7A3F4" "OH"@"SEL$1")
      INDEX(@"SEL$A8B7A3F4" "O"@"SEL$13" ("OCRN"."ORG_PK" "OCRN"."DSCLR_DSCLB_FL" "OCRN"."DSCLR_RPTBL_FL"))
      BITMAP_TREE(@"SEL$A8B7A3F4" "D"@"SEL$13" AND(OR(1 1 ("DSCLR"."FORM_TYPE_CD") 2 ("DSCLR"."FORM_TYPE_CD")) ("DSCLR"."DSCLR_TYPE_CD")))
      NO_ACCESS(@"SEL$A8B7A3F4" "DF"@"SEL$13")
      INDEX(@"SEL$A8B7A3F4" "H7"@"SEL$2" ("H760_RGLTY_ACTN_DSCLR"."FLNG_PK" "H760_RGLTY_ACTN_DSCLR"."DSCLR_PK" "H760_RGLTY_ACTN_DSCLR"."REC_SEQ_NB"))
      FULL(@"SEL$A8B7A3F4" "DS"@"SEL$9")
      FULL(@"SEL$A8B7A3F4" "RST"@"SEL$11")
      FULL(@"SEL$A8B7A3F4" "ITT"@"SEL$3")
      FULL(@"SEL$A8B7A3F4" "ST"@"SEL$5")
      FULL(@"SEL$A8B7A3F4" "PT"@"SEL$7")
      LEADING(@"SEL$A8B7A3F4" "OH"@"SEL$1" "O"@"SEL$13" "D"@"SEL$13" "DF"@"SEL$13" "H7"@"SEL$2" "DS"@"SEL$9" "RST"@"SEL$11" "ITT"@"SEL$3" "ST"@"SEL$5" "PT"@"SEL$7")
      USE_NL(@"SEL$A8B7A3F4" "O"@"SEL$13")
      NLJ_BATCHING(@"SEL$A8B7A3F4" "O"@"SEL$13")
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      NLJ_BATCHING(@"SEL$A8B7A3F4" "H7"@"SEL$2")
      USE_HASH(@"SEL$A8B7A3F4" "DS"@"SEL$9")
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      USE_HASH(@"SEL$A8B7A3F4" "PT"@"SEL$7")
      SWAP_JOIN_INPUTS(@"SEL$A8B7A3F4" "D"@"SEL$13")
      INDEX_RS_ASC(@"SEL$13512960" "DF1"@"SEL$14" ("DSCLR_FLNG"."DSCLR_PK" "DSCLR_FLNG"."BLLBL_FL"))
      END_OUTLINE_DATA
  */

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    NOTE - all I'm pointing our here where you potentially use a lot of time so that you can ask whether or not you should do little of the query in this way, or if there is an alternative, or if the work you're doing is absolutely necessary. If you want to optimize the query you should consider the intent of the query and think your way through a reasonable join order to see if you can imagine an effective way to get the same data. I have written a few articles and presentation on an approach that begins by drawing - here is a link to an article I wrote for a group of SQL Server: https://www.simple-talk.com/sql/performance/designing-efficient-sql-a-visual-approach/

    and a video I did with Kyle Hailey, while he was working for Embarcadero:Tune in for the ultimate SQL Tune-off | Landing pages

    Concerning

    Jonathan Lewis

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    • MacBook Pro 15 "(2.8) of 2.5 GHz / RAM 16 / 256 GB of storage / Iris Pro"
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    • Audio engineering. Recording/mixing/mastering audio as a hobby, which may require use of the processor 4 do. My current laptop (2.3 GHz Dual Core Intel i5 - 2410 M) cannot manage even the basics of what I need for comfort work with audio. Usually it is around 10-15 tracks, stock and third-party plugins sometimes. I omit the part that the new laptop should have completely no problems with recording audio through audio interface (no cracks, dents, noises and other things caused by lack of CPU and RAM). I guess that each of these three Mac is capable of a fluent audio recording, the question arises on the comfortable audio processing in the future.
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    • My priority is a seamless workflow without any freeze for 5 minutes and loading/closing time take up to 10 minutes, as it does now
    • It is not important if a graphic/audio project takes longer to make, but it is important to work freely during production
    • I don't mind having an external USB storage, as long as he has a decent read/write speed (external USB flash are available for Macs, right?)
    • Design or audio are not my original recipes, rather a freelance opportunities or leisure

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    • Is there a really significant difference in the performance of the tasks that have been mentioned between 2.2 GHz and 2.5 GHz/2.8 GHz?
    • No AMD video card makes a huge difference in terms of working with graphics? (Of course, he does, but it would be nice to take a look at the difference in the form of a chart or a reference; if it is not dramatic, then pay more for the video card makes no sense for me)
    • Then Iris Pro (which comes with 2.2 GHz cheaper option) handle some minor games like World of Warcraft or Diablo 3? Not necessary on ultra or high settings, but on those that make the game playable and enjoyable. (Is not necessary, but it would have been a considerable advantage, because even though I'm not a hardcore gamer, it's nice to play some old games favorite from time to time)

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    If you select I would recommend 512 GB drive. Media projects can become very large, and I suspect that you also like to have pictures of the reserve, textures, etc available all the time. I'm not a professional graphic designer, but I create brochures and documents as well as videos of 15-20 minutes and on a 256 GB drive I will decide on a project, move everything turned off, and then start a new project. Sometimes, when I had several projects going at the same time I had to decide which awkward solution was the best.

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    I was watching

    "target ="_blank"> http://www.play.com/PC/PCs/4-/685706...rce=9593"

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    http://www.play.com/PC/PCs/4-/598544...ml?source=9593

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