Setting the query: optimizer does not use the index function

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• Performance problem on the SQL query that does not use the primary key index

  Hello!
  
  I have some performance issues on a single SQL query (Oracle 10 g).
  I could solve the problem by using the INDEX indicator, but I would like to know WHY this is happening.
  
  * Tables *.
  create table jobs)
  ID number (5) not null,
  name varchar2 (100),
  primary key constraint Job_PK (id)
  )
  /
  -Record count: 298
  
  create table Comp)
  integer ID not null,
  name varchar2 (100),
  primary key constraint Comp_PK (id)
  )
  /
  -Record count: 193
  
  -Relation m: n
  create table JobComp)
  integer ID not null,
  id_job integer not null,
  id_comp integer not null,
  primary key constraint JobComp_PK (id),
  unique key constraint JobComp_UK (id_job, id_comp),
  Constraint JobComp_FK_Job foreign key (id_job) refers to Job (id),
  Constraint JobComp_FK_Comp foreign key (id_comp) makes reference Comp (id)
  )
  /
  create index JobComp_IX_Comp on JobComp (Cod_Comp)
  /
  create index JobComp_IX_Job on JobComp (Cod_Job)
  /
  -Record count: 6431
  
  * Ask *.
  
  When I run this query, the execution plan shows the index using (JobComp_PK and JobComp_IX_Comp).
  No problem.
  
  Select JobComp.*
  of JobComp
  Join jobs
  on Job.id = JobComp.id_job
  where JobComp.id_comp = 134
  /
  -runs in 0.20 sec
  
  But when I add the field 'name' of the work table the plan uses full access table to the table of work
  
  Select JobComp.*, Job.name
  of JobComp
  Join jobs
  on Job.id = JobComp.id_job
  where JobComp.id_comp = 134
  /
  -runs in the 2.70 dry
  
  With the help of the index
  
  Select / * + INDEX (Job Job_PK) * /.
  JobComp.*, Job.name
  of JobComp
  Join jobs
  on Job.id = JobComp.id_job
  where JobComp.id_comp = 134
  /
  -runs in 0.20 sec
  
  * Doubt *.
  
  This behavior is correct?
  
  PS. : I tried to recalculate the statistics, but nothing changes:
  
  analyze the job calculation table statistics.
  /
  change the statistical calculation of index Job_PK reconstruction;
  /
  Start
  dbms_utility.analyze_schema (sys_context ('userenv', 'current_schema'), 'CALCULATE');
  end;
  /
  
  [of]
  Gustavo Ehrhardt

  Gus.EHR wrote:
  Hello.
  I'm sorry for the plan unformatted.
  The execution time of the querys "without field name' and 'with the field name with suspicion" are equal.
  He has no problem caching, because I get the plans of the sequence different from the querys and repeated the performance. The result is always the same.

  I don't think that there is no problem with oracle crossing LOOP IMBRIQUEE to the HASH JOIN when you include the field name and this should be the expected behavior. But it seems that your WORKING table has a degree of parallelism set against what is causing the query to run in parallel (as JOB table is now available with full table scan, instead of indexed access earlier). It could be that the parallel execution is contributor to extra Runtime.
  (a) do you know why the degree of parallelism on the WORK table has been defined? Do you need it?

  You can see if the following query provides a better response time?

  select /*+ NOPARALLEL(JOB) */ JobComp.*, Job.Name
    from JobComp
    join Job
      on Job.id = JobComp.id_job
   where JobComp.id_comp = 134
  

• 11g R2 optimizer is not using indexes

  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 (*)
  ----------
  1
  
  SQL > exec dbms_stats.gather_table_stats ('SCOTT', 'OPT_TEST', method_opt = > 'for all columns size skewonly');
  
  SQL > explain plan for select * from opt_test where ename = 'KING '.
  
  He explained.
  
  SQL > select parent_id, operation, options, object_name, id, io_cost from plan_table;
  
  ID PARENT_ID OPERATION OPTIONS OBJECT_NAME IO_COST
  ---------- ---------- ------------------------------ ------------------------------ ------------------------------ ----------
  0 SELECT STATEMENT 1365
  1 0 TABLE ACCESS FULL OPT_TEST 1365
  
  
  There is on one employee with the name 'KING' in the OPT_TEST table.
  I have also generated stats on the table and the index but still optimizer makes complete analysis.

  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

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  http://Windows.Microsoft.com/en-us/Windows-Vista/getting-the-best-display-on-your-monitor

   

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  I can use the RDS DataView and see the databases, click cfartgallery, for example and see the facility 'art' content of the table. No problem. Then I click the button of "Visual Query Builder", and nothing happens. The query designer does not appear.
  
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  Fordwebs, LLC
  http://www.fordwebs.com

  "adimauro" wrote in message
  News:g8pt2n$JH1$1@forums. Macromedia.com...
  > I use the ColdFusion Flex Builder 3 (3.0.1.205647), and
  > I
  > cannot use the Visual Query Builder. This is a new installation for ColdFusion8. I have
  > have
  > RDS set up, I even test the connection successfully.
  >
  > I can use the RDS DataView and see the databases, click cfartgallery,.
  > for
  > contents of the example table and the exhibition 'art '. No problem. Then I click on the
  > "Visual Query Builder" button and nothing happens. The query designer is
  > not
  > show.
  >
  > It's not a big deal, until I have try running the CF/Ajax application wizard, and
  > edition
  > the master page is supposed to open the Query Builder... same problem.
  > Even
  > here it does not open. So I can't change anything or use the wizards at all. I have
  > don't get any what error message, it just does nothing when I click on the
  > button.
  >
  > Someone else has this problem? Is there a setting I am missing or have
  > to
  > set up after a new installation in the CF administrator?
  >

• View does not use index Mview underlying but mview uses indexes

  Hello

  I faced a situation where, while querying data to display based on mview does not use the index, but when we wonder of mview it uses index and produce quick results.

  Here are the details:

  
  querying from view: (completes in more than a minute even after passing hint)
  ================================
  explain plan for select /*+ index(  ITGI_CREDITOR_LEDGER_CMV ITGI_CREDITOR_LEDGER_INDX) */ * from CR_LEDGER_REP_V where vendor_id='1474911';
  
  Plan hash value: 463951623
  
  ---------------------------------------------------------------------------------------------------
  | Id  | Operation              | Name                     | Rows  | Bytes | Cost (%CPU)| Time     |
  ---------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT       |                          |  9056K|  5648M| 97644   (1)| 00:00:04 |
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  |   2 |   COUNT                |                          |       |       |            |          |
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  ---------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     1 - filter("VENDOR_ID"=1474911)
  
  
  
  Querying from mview: (completes within a second)
  ==============================
  
  explain plan for select /*+ index(  ITGI_CREDITOR_LEDGER_CMV ITGI_CREDITOR_LEDGER_INDX) */ * from ITGI_CREDITOR_LEDGER_CMV where vendor_id='1474911';
  
  
  Plan hash value: 1726512073
  
  --------------------------------------------------------------------------------------------------------------------
  | Id  | Operation                              | Name                      | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT                       |                           |    21 |  5880 |    21   (0)| 00:00:01 |
  |   1 |  MAT_VIEW ACCESS BY INDEX ROWID BATCHED| ITGI_CREDITOR_LEDGER_CMV  |    21 |  5880 |    21   (0)| 00:00:01 |
  |*  2 |   INDEX RANGE SCAN                     | ITGI_CREDITOR_LEDGER_INDX |    22 |       |     3   (0)| 00:00:01 |
  --------------------------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     2 - access("VENDOR_ID"=1474911)
  
  
  
  View DDL
  ========================
  
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  (
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     SR_NO,
     VENDOR_ID,
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     PAYMENT_DATE,
     ACC_CODE,
     PAYMENT_METHOD,
     CURR_CODE,
     DEBIT,
     CREDIT
  )
  AS
     SELECT qry,
            ROWNUM srn,
            vendor_id,
            vendor_type_lookup_code,
            vendor_no,
            vendor_name,
            vendor_site_id,
            vendor_site_code,
            gl_date,
            accounting_date,
            po_distribution_id,
            invoice_type_lookup_code,
            invoice_num,
            doc_category_code,
            invoice_date,
            inv_voucher_num,
            payment_num,
            check_number,
            description,
            pay_accounting_date,
            account_code,
            payment_method_code,
            invoice_currency_code,
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            credit
       FROM sanjay.itgi_creditor_ledger_cmv;
  
  
  
  

  The plan does not change even if I do not use advice.

  Although I said developer to use mview directly, but I did not understand this behavior.

  DB version: 12.1

  OPERATING SYSTEM: AIX 6.1

  Kind regards

  Gerard

  Note that the query on the view plan is only to apply your filter predicates on line 1, rather than against the mview in line 3. Line 2 said you that enforcement must correspond to a kind of County before it can filter which is due to the virtual rownum in your point of view.

  You need this column? In my opinion, it's meaningless. Remove the column from the view would mean that the view doesn't have to be assessed in its entirety (if not, how it will calculate rownums?) before allowing you to filter. You asked the developer to implement the work is likely to come with a different value of sr_no (if the developer is even using it?) than what he would have obtained by using the view.

  The column tries to catch a unique key for the view? Are you aware that rownum values can and will change between requests to the same table as the order lines are selected is not guaranteed. If the column is actually useful (and it is correct to calculate at this level) you then could it sense it is calculated inside the mview? This means that you can only refresh the mview completely and rownum values can (and will) only change on refresh.

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  c115bca7-E432-460f-a0c5-273b2157dcbe wrote:

  Hi all, I am new to Oracle DB. Reported by developer that storage space is full, and then I found that there are two data files associated with the storage space by checking dba_data_files. The first data file size is already full of 32GB, and the second is 8GB. However, it seems that the tablespace does not use the data file second when I check the free space of the tablespace because I cannot find its use. That's why Oracle DB shows ORA-01654 and tell me to add another data file. I fix this by adding another data file. But I'm just wondering why it seems that the tablespace does not use the second data file, I checked the status of second in the data file is online of v$ datafile. Could someone give me an idea about this problem? Thank you very much.

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  DG 2010-03-23-17: 0 2 714415739 MICHAEL 46:45: GET_DRC finished
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  -------------- ----------
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  I did the steps
  
  Create spfile pfie
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  NAME_COL_PLUS_SHOW_PARAM                                                         TYPE
  -------------------------------------------------------------------------------- ------
  VALUE_COL_PLUS_SHOW_PARAM
  ---------------------------------------------------------------------------------------
  spfile                                                                           string
  C:\ORACLE\PRODUCT\11.1.0\DB_1\DATABASE\SPFILEORABASE.ORA
  SQL> 
  

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