index on the column using custom function

Similar Questions

• index on the column of low cardinality

  Hello
  Standard edition Oracle 10.2
  
  I have a 'status' column in my table. table contains about 100000 records.
  The possible values of status will be 1 or 2 (digital). This column will be 5 to 10 percent of the population, and the rest is null.
  
  Because it is seems that bitmap index is candidate for low cardinality column, but this picture has high of DML operations. SO by web research I learned about this bitmap causes problems of blocking on high DML operations.
  
  So I think that B-tree is only option left. Can you suggest a good index to improve performance on such a column?

  You don't need an index based on a function, do you think?

  You have a STATUS column where a small percentage of values is not null.

  To effectively access these lines whose STATUS is non-zero, simply create an index on the column State.

  This should be plenty effective.

  The effectiveness of this index (or the fbi if she was forced) is based on the fact that an index b-tree contains entry when the value is null (or all of the values in the case of a composite).

  There are those that 100000 is small and 5-10% is not particularly selective and you tell the width of the table, etc., so, even with the index here, it might not if used - i.e. depending on the circumstances it might be more efficient to do a FTS.

  It depends on what you want to do.

  See:
  http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:4433887271030
  http://richardfoote.WordPress.com/2008/05/12/index-scan-or-full-table-scan-the-magic-number-magic-dance/

  Published by: Dom Brooks on February 10, 2011 12:58

• Get the index of the column of table removed

  Is there a way to get the index of the column in a 2D table that has been deleted? In my application, the user has the possibility to use the right click option 'remove a column' on a 2D picture, but I would like to use this information to remove the same column in a different table programmatically. Is this possible?

  There is a file published in the documents of the community that refers to a location in a sheet of the user has clicked.  Use it like the image below.

  https://decibel.NI.com/content/docs/doc-22434

  

• Index on the column of string with uppper?

  Hello

  I have the table containing the primary key of the string column. I want to create the index on the primary key and another column.

  Best solution (for the performance) will be create index higher using as

  ON TABLE (UPPER("ID"), ANOTHER_COLUMN)

  or without SHANK

  ?

  Best regards

  m.

  Hope that the ID is a primary key. If this query will return one row, and it will go for a sweep of unique index. Just remove the UPPER function and do like id = UPPER (value);

  Before removing the UPPERCASE function, make sure that the data will be uppercase in the table.

  Because of the HIGH, it will not hit the Unique index...

• How to create indexes on the column xmtype

  Hello
  
  I have a table as follows
  
  CREATE TABLE T_TEST_XML (ID_PROCESSUS NUMBER, TXT_XML XMLTYPE);
  
  
  I query the table above very frequently with the query
  
  SELECT * FROM TXS T_TEST_XML WHERE EXISTSNODE (TXS. TXT_XML, '/ order [status = "PEN"]') = 1
  
  
  How to create function function index on the TXT_XML column for the xpath expression/order [status = "PEN"]' to improve the query performance?
  
  Thank you

  In fact if you are limited to the use of older software

  1 consider to define an XML schema and store XML using storage relational object.

  or

  2. If you need to store XML as CLOB to create the index on extractValue(), rather than existsNode() and provide the underlying value at the SQL level rather than the XPATH level.

  SQL> DROP TABLE T_TEST_XML
    2  /
  
  Table dropped.
  
  SQL> CREATE TABLE T_TEST_XML (PROCESS_ID NUMBER, TXT_XML XMLTYPE)
    2  /
  
  Table created.
  
  SQL> create INDEX T_TEXT_XML_IDX on T_TEST_XML( extractValue(TXT_XML,'/order/status'))
    2  /
  
  Index created.
  
  SQL> set autotrace on explain
  SQL> --
  SQL> SELECT *
    2    FROM T_TEST_XML TXS
    3   WHERE ExistsNode(TXT_XML,'/order[status="PEN"]') = 1
    4  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3001212210
  
  ---------------------------------------------------------------------------------
  | Id  | Operation          | Name       | Rows  | Bytes | Cost (%CPU)| Time     |
  ---------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT   |            |     1 |  2017 |    31   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS SEMI |            |     1 |  2017 |    31   (0)| 00:00:01 |
  |   2 |   TABLE ACCESS FULL| T_TEST_XML |     1 |  2015 |     2   (0)| 00:00:01 |
  |*  3 |   XPATH EVALUATION |            |       |       |            |          |
  ---------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - filter("P"."C_01$"='PEN')
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL> SELECT *
    2    FROM T_TEST_XML TXS
    3   WHERE extractValue(TXT_XML,'/order/status') = 'PEN'
    4  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 1430727070
  
  ----------------------------------------------------------------------------------------------
  | Id  | Operation                   | Name           | Rows  | Bytes | Cost (%CPU)| Time     |
  ----------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT            |                |     1 |  2015 |     1   (0)| 00:00:01 |
  |   1 |  TABLE ACCESS BY INDEX ROWID| T_TEST_XML     |     1 |  2015 |     1   (0)| 00:00:01 |
  |*  2 |   INDEX RANGE SCAN          | T_TEXT_XML_IDX |     1 |       |     1   (0)| 00:00:01 |
  ----------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     2 - access(EXTRACTVALUE(SYS_MAKEXML(0,"SYS_NC00003$"),'/order/status',null,0,0,5242
                93,133120)='PEN')
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL>
  SQL>
  SQL>
  SQL>
  SQL>
  SQL>
  

  This allows the index press questioning on any status value, rather than just the PEN

• decide how to add indexes on the column

  Hi all
  
  I get about confious using index
  
  When should I decide to add index?

  http://docs.Oracle.com/CD/E11882_01/server.112/e25789/indexiot.htm#CNCPT811

  In general, consider creating an index on a column in any of the following situations:
  
      The indexed columns are queried frequently and return a small percentage of the total number of rows in the table.
  
      A referential integrity constraint exists on the indexed column or columns. The index is a means to avoid a full table lock that would otherwise be required if you update the parent table primary key, merge into the parent table, or delete from the parent table.
  
      A unique key constraint will be placed on the table and you want to manually specify the index and all index options.
  

• Creation of several indexes of the columns of same

  Oradocs a little wave, at least my current source.

  When I create 2 indices of different types, example a bitmap another b-tree, on the same order of column, can both be running at the same time or if one of them must be invisible?

  He can't do it on my own, I have standard edition that does not support bitmap indexes

  Here:

  CREATE INDEX fun1 on employees (last_name);

  create fun2 index bitmap on employees (last_name);

  Thank you

  Oradocs a little wave, at least my current source.

  Docs? I don't see a link to any docs. We cannot comment on something that we cannot see. Post links to "Oradocs" you are talking about.

  When I create 2 indices of different types, a bitmap example another tree-b,.
  on the same column order, both can be operational in even
  time, or if one of them must be invisible?

  One of them may be visible. And several index on the same columns apply only to the 12 c.

  The Blog of Tom Kyte: 12 c - more than one index column even...

• The key to the label using custom in Lightroom 6

  I'm not getting something on the definition of the custom label (white label) for a group of photos.  The last discussion I found on it's back in 2010 with LR4.  I have a group of photos during a shoot, I want to put custom label.  All other color labels can be defined by clicking on the photo (or a group of photos) and pointing to the "color Label" and then selecting the color.  The custom label does not appear in the selection process.  What I'm missing here?

  By George, I think I've finally managed!  Trick is to change the IPTC Metadata presets.  Right-click on an image and select the preset metadata and change the presets at the bottom of the menu.  Fill in the Label field in the base at the top and all IPTC section that you want to include.  Then create/save the preset.  Which added a 7th "Preset" (white) to the column label in the metadata field in the library filter.  To assign to a photo or group of photos, select the photo, right-click for the shortcut menu, and then select the preset metadata.  The following menu should have your Preset predefined metadata.  Click on that and your done.

  Hope this helps others who may have been confused by this.  Thanks to those who gave me entry as well.

  Stephen

• Value of the column used as a column in the join

  We have three tables
  

  Product table          
  Pno     Pname     Htype1     Htype2
  101     ABC     Ltype1     
                 
  Loc Table          
  LocId      LocName Ltype1 Ltype2
                 
                 
  TransportTable          
  Tid     Ttype     LocId     

  I need to create the query like this
  

  begin
  
  select Ltype1 into v_type
  from Product 
  where Product = 101;
  
  for x in (select t.Tid,t.Lid 
               from Loc l,Transport t
            where l.locid = T.locid
                  and t.ttype = 'l.'|| v_type ) --- Getting Problem when the column 
                         which is set in Htype1 in Product table to be used to join here
      loop

  Can you pls suggest/help me how to use the colum that is located in Htype1 in the Product table
  to be used in the cursor?
  
  Thank you very much
  
  Published by: user12093849 on August 2, 2010 06:32
  
  Published by: user12093849 on August 2, 2010 06:32

  Hello

  As Sven said, the paintings were not designed for a relational database. The longer term solution wouold be redisgn the tables of a relational database.

  The fundamental problem is that identifiers (such as column names) should be hardcoded in the query when compiling. You cannot use variables.
  You can use variables in the Dynamic SQL statements , where the application is not compiled until the time of execution. I find this easier to do in SQL * more, using the substitutuion variables, but you can do dynamic SQL in PL/SQL, too.

  Depending on the data types involved, something like that can work for you as well:

  SELECT     t.tid
  ,     l.lid
  FROM     loc          l
  ,     transport     t
  ,     product          p
  WHERE     p.product     = 101
  AND     l.locid          = t.locid
  AND     t.ttype          = CASE  p.htype1
                       WHEN  'Ltype1'     THEN  lytpe1
                       WHEN  'Ltype2'     THEN  lytpe2
                   END
  ;
  

  This is likely to be less effective than other alternatives.

• Select the column using

  Hello
  
  I have a report with 4 columns, 'Year', 'Demand amount', 'Amount of the purchase order' and 'invoice amount.
  
  The user want to select "Amount of demand", "The purchase order amount" or "Invoice amount" in the drop down menu from the drop in the Oracle replies
  
  In other words, he wants to see only the year and "amount of demand."
  year or "amount in the purchase order.
  year or "amount of the invoice.
  
  How can I do? I already search column, select but did not understand. Please tell me in detail.
  
  Thank you

  Hello user.

  I advise to use the column picker in the responses.

  (1) build your table (or any other point of view) a year and the amount of the claim.
  (2) then create a view by using the choice of mode 'column selector.
  (3) check the checkbox 'Include the selector' for your column 'amount of demand. "
  (4) add the other two columns in the selection pane. Your view should look like the image below:

  ! http://i46.Tinypic.com/2gwyfso.jpg!

  5) go to your compound view and add your views 'column selector.

  You should now be able to Exchange "Amount of demand", "The purchase order amount" and "Amount of the invoice" using the column Chooser, and your other points of view should replace columns that you select.

  I hope this helps and please assign points if you found it useful!

  Kind regards
  Jason

• Get rawvalue (index) of the Listbox using FormattedValue

  I have two drop-down menus with two different sets of data. a country and another with the profession.

  I have a listbox with all the possible country/profession together to form a formattedvalue. How can I get the rawvalue/index with the formattedvalue of two fields above.

  I will choose a country in particular and profession and then I need to get the index of this combo in the listbox.

  Any help would be appreciated.

  I solved my problems. Here is the code I have developed to do the job. It could be simplified a bit further, but it worked fine.

  I put it in the action of the entry.

  checkValue .rawValue = var [dropdown1]+ [dropdown2].formattedValue + «,»

  oArr var = checkValue.split (",");

  oList var = xfa.resolveNode (.somExpression[listbox with the values of index and concat]);

  var oListIndex;

  While {(oArr.length!=0)}

  oListIndex = oList.boundItem (oArr.pop ());

  oList.setItemState(oListIndex-0,1);

  }

  NOTE: You can add if statement to make it work only if these fields have values just before while the State.

• Cannot remove index via the transformation script custom

  I want to remove through the Custom transformation script a clue, in the relational model.
  Le script runs without error by only the index is not deleted

  1. tables = model.getTableSet () .toArray ();
  2. for (var t = 0; t < tables.length; t ++) {}
  3. table = table [t];
  4. table.setDirty (true);
  5. constlist = table.getKeys ();
  6. for (var i = 0; i < constlist.length; i ++) {}
  7. constraint = constlist [i];
  8. constraint.setDirty (true);
  9. indname = constraint.getName () + "_IX";
  10. {if (Constraint.isFK ())}
  11. index = table.getIndexes () .getByName (indname);
  12. index = table.getObject (indname);
  13. If (index! = null) {}
  14. index.setDirty (true);
  15. {if (index. GetName(). Equals (indname))}
  16. the index. Remove;
  17. }
  18. }
  19. }
  20. }
  21. }

  Hello

  If you use "debug", probably you will see some of the problems you have.

  line 16 - index.remove;

  be - index.remove ();

  but you can't get there because you're wrong check:

  {if (Constraint.isFK ())}

  must be:

  {if (!) {(Constraint.isFK ())}

  other problems:

  (1) 4th place will put all the paintings as dirty

  table.setDirty (true);

  This should be moved after the removal of the index

  (2) the same for the constraint - you define constraints like salty, BTW, it is not necessary define elements of array as dirty, if the table is / will be defined as dirty.

  Script could be dangerous - make your tests on the copy of the drawing or model. Versioning can help here - after running the script and save the drawing, you can see in the outgoing changes (subject to a window changes) exactly what is changed by this script and probably undo the changes if you don't like them.

  Philippe

• It's a good idea to create an index on a column used for partitioning

  I'm new to using partitions as well as the index. Can someone help me with the situation below?
  
  I have a table defined as below
  
  
  CREATE TABLE FACT_MASTER
  (
  PERIODCODE NUMBER (8) NOT NULL,
  PRODUCT_CD NUMBER (10) NOT NULL,
  DPT_CD NUMBER (3).
  FACT_VALUE1 NUMBER,
  FACT_VALUE2 NUMBER,
  FACT_VALUE3 NUMBER,
  .....
  .....
  .....
  .....
  .....
  FACT_VALUE50 NUMBER
  )
  PARTITION BY RANGE (PERIODCODE)
  (
  partition P1 lower values (2002),.
  partition P2 lower values (2003).
  lower partition P3 values (2004),
  ...
  ..
  )
  
  This table is partitioned on the shop period code.
  
  In a select query on the table, period code and product code are used. I intend to create an index to improve performance. Does make sense to include the period code column in the index? I intend to create indexes only for the product code column. I think that the partition itself behaves as an index for periodcode. Can someone tell me if this is correct? I use 10g.
  
  Published by: user6794035 on January 21, 2010 08:47
  
  Published by: user6794035 on January 21, 2010 08:50

  If the index is an overall index, then yes it is worth including. But check that your SQL would actually benefit an overall index.

  If your period still code in SQL, then the partition pruning will natuarally and would therefore not be required to be part of the index!

  P;

• The fonts using custom with the NDK

  Hello. I develop a simple game with the NDK and would like to know if anyone knows how I can load a police custom in the playbook in my game. I tried to copy it with the rest of the resources and charging from there, but when I try to load the font with the "FT_New_Face" function, I get an error and the error code returned is 1. I tried with different fonts (ttf and OTF) and the result is always the same. Anyone know how I can solve this problem, or even if it is possible? Thank you.

  I found the problem on my end, typo. The path must contain no attack "/":

  "app/native/BILLH___.TTF"
  

  Scott

• The fields using custom to download Media

  Hay guys.

  You have a problem, I'm stuck at the moment.

  I have a site that I use 3 buttons html designed to allow downloads of brochures, videos, and put a link to another page. The problem I have is that I want to use the custom (from individual products) fields at home, where is the link to download media.

  I have the buttons pointing to custom fields, but I don't know what I should put in the custom field so that they point to the downloading of media.

  I'm kinda new to BC, so that would explain why I can't understand the way we do.

  The media download real entity?

  If Yes, then you'll need get the url for this link, you can use the editor to insert it into the body, get the link and that cut.