How it warns Oracle to use an index for the join of two tables...

Similar Questions

• Parent index for the data in a table?

  Is there a way to index a child table with a function to include a column from a parent table?

  Example:

  I want to see how many children live in a zip code (and their address is listed with their parents)

  Select count (*)

  class c of child, parent p

  where c.parent_id = p.parent_id

  and p.zipcode = "12345"

  Is there a way to make an index of children with a function that gets parents zip code?

  Thanks for the help?

  An index on the child table can reference only the columns of the child table.  You can't have an index on the child table that is based on information from the parent table.

  There are the function-based index, but they may involve only constants and deterministic functions (and, of course, the columns of the table).  For example, the child table could have a clue on UPPER (name), where last_name is a column of the table, but he could not have a clue about get_zip (parent_id), where get_zip is a function defined by the user who queries the parent table.

  Well - you "might" have a functional indication if you did to be deterministic, but it is not recommended because if the changed zip_code parent would really not deterministic and the change would not be included in the index.

  This apart from this code will work properly if the zip_code data does not change:

  CREATE TABLE parent (COL1 number primary key, zip VARCHAR2 (5))
      
  create the child table (col1 number, parent_key number);

  create or replace function get_zip (number p_key) return deterministic varchar2 as
  v_zip varchar2 (5);
  Start
  Select zip from v_zip of the parent where col1 = p_key;
  Return v_zip;
  end;

  /

  create indexes on children (get_zip (parent_key)) child_zip;

• How do good group when the join of two tables?

  Hi all
  
  The slot using join query, I'd like to get an output will depend on the number of 'Classes' (for example: if I want the result for 15 classes, then, he must return to 16 lines from 0 to 16).
  I n query below, I use the group as

  "GROUP BY report_parameters.report_parameter_value  "

  .
  
  Error that says "this is not group by expression.
  
  If I have commented here, here he returns 320 rows instead of 16 ranks.
  
  Could someone help me?
  
  

   SELECT 'SUM('
      || 'CASE '
      || 'WHEN edr_class_by_gvw_report_data.bin_id >= ' || report_range_parameters.report_parameter_min_value || ' 
           AND edr_class_by_gvw_report_data.bin_id  < ' || report_range_parameters.report_parameter_max_value || '
          THEN edr_class_by_gvw_report_data.bin_value '    
      || 'ELSE 0 '
      || 'END '
      || ') "Class ' || report_parameters.report_parameter_value || '" '    
        FROM report_parameters
        JOIN report_range_parameters
          ON report_parameters.report_parameter_id = report_range_parameters.report_parameter_id 
       WHERE report_range_parameters.report_parameter_id    = 2316    
         AND report_range_parameters.report_parameter_group = 'GVW_GROUP'
         AND report_range_parameters.report_parameter_name  = 'GVW_NAME'
         AND report_parameters.report_parameter_group = 'CLASS'
         AND report_parameters.report_parameter_name  = 'CLASS' 
       GROUP BY
        report_parameters.report_parameter_value  
       ORDER BY  report_range_parameters.report_parameter_min_value ASC;

  Thank you.
  
  Published by: user10641405 on June 11, 2009 12:23
  
  Published by: user10641405 on June 11, 2009 12:30

  Hello

  Let me explain what I'm trying to do.
  I want to write a query that produces this output:

  SUM(CASE WHEN edr_class_by_gvw_report_data.gvw >= 0 AND edr_class_by_gvw_report_data.gvw  < 5 THEN edr_class_by_gvw_report_data.gvw_count ELSE 0 END ) "Class 0"
  SUM(CASE WHEN edr_class_by_gvw_report_data.gvw >= 5 AND edr_class_by_gvw_report_data.gvw  < 10 THEN edr_class_by_gvw_report_data.gvw_count ELSE 0 END ) "Class 1"
  SUM(CASE WHEN edr_class_by_gvw_report_data.gvw >= 10 AND edr_class_by_gvw_report_data.gvw  < 15 THEN edr_class_by_gvw_report_data.gvw_count ELSE 0 END ) "Class 2"
  SUM(CASE WHEN edr_class_by_gvw_report_data.gvw >= 15 AND edr_class_by_gvw_report_data.gvw  < 20 THEN edr_class_by_gvw_report_data.gvw_count ELSE 0 END ) "Class 3"
  SUM(CASE WHEN edr_class_by_gvw_report_data.gvw >= 20 AND edr_class_by_gvw_report_data.gvw  < 25 THEN edr_class_by_gvw_report_data.gvw_count ELSE 0 END ) "Class 4"
  

  using data from tables report_parameters and report_range_parameters, which are like your tables.
  Right now, I don't have report_parameters and report_range_parameters tables.
  I need to create and put the data in them that is like your data.
  If I have the same data you have, and if I can produce the results that you want from the data, so I'll post my query, and you can use it.

  I do not see how to INSERT statements like this:

  INSERT INTO "class_by_gvw_report_data"
            SELECT site_id,
                site_lane_id,
               site_direction_id,
              site_direction_name,
                bin_start_date_time,
                bin_end_date_time,
                bin_id,
              bin_value
           FROM "class_by_gvw_bin_data"
  

  can help me. Is the table "class_by_gvw_report_data" invloved in this problem? Is this the same as report_parameters or report_range_parameters? If Yes, I need to create it, and put the data into it, so to use the above statement I need all data of "class_by_gvw_bin_data".

  I need to have something that I can run, so that my paintings will have sample data which would result in the desired output.
  I need the CREATE TABLE statements, but I can probably guess what they should be if I have your data. If this isn't the case, I will seek further clarification later.
  I can't guess what your data, and why is it causing problems. If I just do a few data, LII is virtually no chance he's going against hepatitis has a relationship between the tables that are causing you problems of the same nature.

  Please post INSERT statements that I can run and produce the same type of data that is causing problems.

• How to use an index with the clause 'in '.

  Hi all
  
  I have a sql statement with "" * in the clause * "."
  
  for example:
  

  select emp_id from emp where ename in ("vikas", "krishna", "John", "scott");

  When I check the plan explain he uses the index here even if the statistics was entered. He always goes for the full table scan.
  There is an index created for the ename column.
  
  Please tell me a technique on how to make use of the index here.
  
  
  Thank you and best regards,
  Vikas Krishna

  Vikas,

  What version of Oracle you are running.
  CLAUSE IN will use the index as appropriate.
  In your example Optimizer may decide to use FTS (Full Tablle Scan) for various reasons. May be that the table is very small.
  SE for example below where he uses an index on the CLAUSE IN...
  The essential point being that I made "wide enough" table (in this case including a column of type CHAR) makes use of INDEX more effective than a FTS.

  select * from v$version where rownum < 2;
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
  
  create table bigt (c int, s char(100));
  
  insert into bigt select level, 'X' from dual connect by level < 501;
  
  create index bigt_in1 on bigt (c );
  
  exec dbms_stats.GATHER_TABLE_STATS('SUDHAKAR', 'BIGT');
  
  explain plan for select c,s from bigt
  where c in (1,2,3,43,5);
  
  select * from table(dbms_xplan.display);
  
  PLAN_TABLE_OUTPUT
  
  Plan hash value: 238667275
  
  -----------------------------------------------------------------------------------------
  | Id  | Operation                    | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
  -----------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |          |     5 |   520 |     3   (0)| 00:00:01 |
  |   1 |  INLIST ITERATOR             |          |       |       |            |          |
  |   2 |   TABLE ACCESS BY INDEX ROWID| BIGT     |     5 |   520 |     3   (0)| 00:00:01 |
  |*  3 |    INDEX RANGE SCAN          | BIGT_IN1 |     5 |       |     2   (0)| 00:00:01 |
  -----------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - access("C"=1 OR "C"=2 OR "C"=3 OR "C"=5 OR "C"=43)
  

  VR,
  Sudhakar B.

• How to start a job using DBMS_SCHEDULER depending on the result of other JOBS

  How to start a job using DBMS_SCHEDULER depending on the result of other JOBS

  For example I have two jobs A and B of EMPLOYMENT, I would like to start JOB B only when a JOB is complete, is an option like that?

  Hello

  Yes, you can create a channel with the Scheduler, see the documentation:

  Creation and management of channels of employment

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• Oracle of the MAF error ' cannot read the DataControl uses on loadDataControl for the id:

  Need help!

  I created a simple SOAP web service for a remote database that works very well in 12 c WebLogic Server and also in the Jdeveloper HTTP Analyzer. When I use the same web service in the attached code, I get the following error (I've included output System.out.println in Ref. to the flow of the code) I use Jdeveloper 12 c MAF 2.0.0.0.41 on Mac OSx 10.9.

  Chk #0

  Processing line # 1

  Chk #1

  Chk #2

  [SEVERE - oracle.adfmf.framework - AmxBindingContext - loadDataControlById] Cannot read the DataControl uses on loadDataControl for the id: WLFNewActWS. [SEVERE - oracle.adfmf.framework - SynchronizationDC - syncDataFromOfflineToOnline] [Ljava.lang.StackTraceElement;@467c53d3

  @

  


  Sorry about that, I think I'm wrong you.

  OK, I created an example to test what goes wrong.

  1. server side, create a project named Employee_ws

  a. Department_ws.java

  public interface {Department_ws}

  public boolean addDepartment (a Department);

  }

  b. Department.java

  public class {Department

  public Department() {}

  Super();

  }

  int departmentId.

  String departmentName;

  locationId int;

  managerId int;

  {} public void setDepartmentId (int departmentId)

  this.departmentId = departmentId;

  }

  public int getDepartmentId() {}

  return departmentId.

  }

  {} public void setDepartmentName (String departmentName)

  this.departmentName = departmentName;

  }

  public String getDepartmentName() {}

  return departmentName;

  }

  {} public void setLocationId (int locationId)

  this.locationId = locationId;

  }

  public int getLocationId() {}

  return locationId.

  }

  {} public void setManagerId (managerId int)

  this.managerId = managerId;

  }

  public int getManagerId() {}

  return managerId;

  }

  }

  c. Department_impl.java

  @WebService

  / public class Department_impl implements Department_ws {}

  public Department_impl() {}

  Super();

  }

  @Override

  @WebMethod

  {} public boolean addDepartment (@WebParam (name = "arg0") a Department)

  If (Department! = null) {}

  int departmentId = department.getDepartmentId ();

  String departmentName = department.getDepartmentName ();

  int locationId = department.getLocationId ();

  managerId int = department.getManagerId ();

  Connection Conn;

  try {}

  Conn = ConnectionFactory.getConnection ();

  conn.setAutoCommit (true);

  Statement šment = conn.createStatement ();

  String inset_sql =

  "INSERT INTO dept (department_name, location_id, department_id, manager_id) VALUES ('+ '.

  departmentId + "," "" + departmentName + "'," + locationId + "," + managerId + ")";

  šment. Execute (inset_sql);

  Returns true;

  } catch (Exception e) {}

  System.out.println (e);

  }

  }

  Returns false;

  }

  }

  d. ConnectionFactory.java

  import java.sql.Connection;

  to import java.sql.DriverManager;

  import java.sql.SQLException;

  Connect to the database

  public class {ConnectionFactory

  public ConnectionFactory() {}

  Super();

  }

  protected static connection conn = null;

  public static connection getConnection() bird Exception {}

  If (conn == null) {}

  try {}

  String driver = "oracle.jdbc.driver.OracleDriver";

  String url = "jdbc:oracle:thin:@localhost:1521:orcl";

  User String = "employee";

  String password = "employee";

  Class.forName (driver);

  Conn = DriverManager.getConnection (url, user, password);

  } catch (SQLException e) {}

  System.Err.println (e.getMessage ());

  }

  }

  return conn;

  }

  public static {} Sub closeConnection()

  try {}

  If (conn! = null) {}

  Conn.Close ();

  Conn = null;

  }

  } catch (Exception ex) {}

  throw new RuntimeException (ex);

  }

  }

  }

  You can run Department_impl.java to start the Web service. i.e. http://127.0.0.1:7001 / Employee_ws-Client-context-root/Department_implPort? WSDL

  Server side sql:

  CREATE USER employee IDENTIFIED BY employee DEFAULT TABLESPACE users

  Temp TEMPORARY TABLESPACE

  Users WE QUOTA UNLIMITED;

  GRANT create employee to logon.

  GRANT alter used to logon.

  GRANT create any employee at table;

  GRANT create trigger employee TO;

  GRANT create any employee to view;

  GRANT create sequence employee TO;

  GRANT create synonym employee TO;

  GRANT create type employee TO;

  GRANT create employee to procedure;

  CREATE TABLE (DEPT

  DEPARTMENT_ID NUMBER (7, 0) NOT NULL,

  DEPARTMENT_NAME VARCHAR2 (50).

  NUMBER OF LOCATION_ID (7, 0),

  MANAGER_ID NUMBER (7.0)

  );

  2 create a mobile application of CRG named Dept

  

  a. Department.java (even for the server)

  b. SynchronizationDC.java

  import java.util.ArrayList;

  import java.util.List;

  Import oracle.adfmf.framework.api.AdfmfJavaUtilities;

  Import oracle.adfmf.framework.exception.AdfInvocationException;

  public class SynchronizationDC {}

  public SynchronizationDC() {}

  Super();

  }

  public void syncDataFromOfflineToOnline() {}

  It's just for testing, so I build Department manually instead of mobile db data, please replace in your business logic

  A Department = new Department();

  department.setDepartmentId (1);

  department.setDepartmentName("1");

  department.setLocationId (1);

  department.setManagerId (1);

  NamesList list = new ArrayList (1);

  List ParamsList = new ArrayList (1);

  List TypesList = new ArrayList (1);

  namesList.add ("arg0");

  paramsList.add (department);

  typesList.add (Department.class);

  try {}

  AdfmfJavaUtilities.invokeDataControlMethod ("Dept_WS", null, "addDepartment", namesList, paramsList,

  typesList);

  } catch (AdfInvocationException e) {}

  System.out.println (e);

  }

  }

  }

  c. new an AMX pag called Dept.amx

  "http://www.w3.org/2001/XMLSchema-instance" xmlns:amx ="http://xmlns.oracle.com/adf/mf/amx"

  xmlns:dvtm ="http://xmlns.oracle.com/adf/mf/amx/dvt" >. "

  Text = "syncDataFromOfflineToOnline."

  Disabled = "#{!}" Bindings.syncDataFromOfflineToOnline.Enabled}"id ="cb3"/ >

  d. deploy on Android Simulator

  

  Click the button and a new record have been db insert through the webservice, search the remote db recording

  

  If above does not solve your problem, please let me know, thanks.

  Byron

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  The oracle table has a primary key, based on columns (c1, c2, c3).
  
  Now, the oracle table also has a unique index (for example defined on columns c4, c5) in support of some queries.
  
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  Chris

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