Which is faster - IN or EXISTS?

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• ETG vs. insert add in parallel (which is faster)?

  Hi all
  
  The oracle is 11.2.0.3 on a linux machine.
  
  I would like to know what the most rapid between the ETG and insert add in parallel (not index).
  
  ----------------
  
  case A: ETG
  
  create table table_a nologging Parallels 32
  as
  Select / * + full (t) parallel (32 t) * / *.
  of table_b t;
  
  case B: table_a was established in nologgig mode without index.
  
  Insert / * + full (t) parallel (32 t) * / into table_a
  Select / * + full (b) parallel (32B) * / *.
  of table_b b;
  
  -----------------------
  
  As far as I know, both use "direct path write."
  According to my experience, both show similar performance.
  
  I would like to hear your experience which is faster in general and in THEORY.
  
  Thanks in advance.
  Best regards.

  >
  I would like to know what the most rapid between the ETG and insert add in parallel (not index).
  . . .
  in my test case, the two sql show similar performance.
  >
  How do you know? You don't post any case INSERT ADD then why don't test you what you posted and we seek clarification?

• Which is faster or =

  Hello
  
  There are millions of records from a table and have to perform multiple filtering on the same column, which is faster
  
  table.column_name = 10
  or
  table.column_name = 20
  or
  table.column_name = 30
  or
  table.column_name = 40
  
  or+_
  
  table.column_name in (10,20,30,40)
  
  Thank you
  Vijay
  
  Published by: jvjmohan on January 11, 2011 02:42

  Hello

  There is so much difference in the two operators. in the case AND the requirements of thre must pass, only then you will get the output and there a lot of conditions

  In operator, it will not compare an object to another... What ever is in the requirement, it will give the result.

  IN operator within complexity... it will be faster.

• Which is faster; Count (1) or count (*)?

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  Thank you ~ ~

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  BryanSw wrote:

  I'm curious as to which is better to use, tasks created in NiMax or tasks created in the code? If I acquire 8 analog channels, there is a downside to create tasks in NiMax speed? I know there is less code involved but what about the time it takes for labview read the configuration file that contains the tasks that are defined in NiMax? There is a significant advantage in the code?

  Thank you

  Bryan

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• Which is faster in performance

  Hi all
  
  I have a partition on the table according to the 5 data sources, i.e. the partition list. Table has about 100 KB of data.
  
  gives better performance?
  
  Select * from tab1 where source = 2;
  
  or
  
  Select * from tab1 partition (sr2);
  
  Please suggest. As I need to use in queries using several of these tables.
  
  Thank you
  VJ

  jvjmohan wrote:

  I have a partition on the table according to the 5 data sources, i.e. the partition list. Table has about 100 KB of data.
  gives better performance?
  Select * from tab1 where source = 2;
  or
  Select * from tab1 partition (sr2);

  Both are the same - a FTS of the contents of a single partition (assuming I read your comparison properly).

  The problem with the 2nd approach is that uses a static reference to the partition. This cannot be a binding parameter. So let's say you have a 100 sheet music - there will be a 100 sliders in the shared pool for research as follows:
  Select * from tab1 partition (sr1)
  Select * from tab1 partition (sr2)
  ..
  Select * from tab1 partition (sr100)

  This is problematic. In PL/SQL (or), this means having to use dynamic SQL to create an SQL statement with the reference to the correct partition.

  If the criteria of the partition is used, a single SQL cursor is necessary in the shared pool:
  Select * from tab1 where source =: 1

  And this slider can be used for all partitions of the table - as the value bound to the variable in the cursor, allows CBO to determine which partition to use (called partition size).

  In General - by specifying a name of partition in the SQL query is incorrect. Lack of technique use perspective. And also bad from a data modeling perspective. Application code does give not record the database indexes to use for a selectSQL names. So why and then specify the name of a partition in a SQL Select ?

  Inner layer of abstraction between database objects (indexes, partitions, constraints, etc.) and application SQL code, keep intact.

• Which is faster?

  I have a scénarion where I received a comment to replace the sliders of the Varray
  
  Who is the fastest between the slider and VArray? and why?

  What you have shown with this pseudo-code is a process loop nested within PL/SQL.

  In SQL, this is called a nested loops join. A loop through the primary table (external) and for each row in this table, hit the secondary table (inside).

  So, if the loop of the outer table has a 1000 lines, it means an iterations of the loop of 1000. For each iteration, it means release of another cursor on the secondary table - essentially running a 1000 SQL selects on this internal table.

  This is not suitable. Even if that SQL Select intern takes only a 100ms, each row of the outer table means that another 100ms is added to the total operating time. So performance wise, this structure is only a sensible approach when the outer loop table translates into a limited number of lines and therefore a limited number of iterations of the loop and a limited number of select on the inner table.

  The problem you have is therefore not a problem of the use of the wrong structure coding as do not use VARRAYs (never forget the fact that a VARRAY and a cursor are totally different things).

  The problem you have is a design problem. This approach to data processing through nested loops IS slow and IMPOSSIBLE to scale.

  This is why the SQL engine uses not only the treatment of nested loop. It also has the transformation of hash join, merge join transformation and a bunch of other sophisticated algorithms.

  And it is also why it is best to NOT code in PL/SQL nested loops, because the SQL engine has more algorithms in its arsenal to address this problem using a primitive nested loop.

  The design approach you should consider must be based SQL. For example

  // condition 1
  open cursor for
  select
    *
  from outer_table,
       inner_table1  // inner table for condition 1 data
  where outer_table.columns meet condition 1  // apply condition 1
  and outer_table.columns equals inner_table1.colums // join data
  
  // condition 2
  open cursor for
  select
    *
  from outer_table,
       inner_table2 // inner table for condition 1 data
  where outer_table.columns meet condition 2  // apply condition 2
  and outer_table.columns equals inner_table2.colums // join data
  
  etc.
  

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  Hello

  Some new user with InDesign here and we hope, this question makes sense.

  I created a student handbook in InDesign and have managed to set up automatic numbering of pages and everything works fine. However, we now need to create a manual of the instructor who has need to have done the following, and I have no idea how to do to achieve this goal:

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  And if you want to achieve this:

  

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  // AddOnePageBeforeAnyPage-AddSections-RenumberPages-SinglePageDocument.jsx
  // Uwe Laubender
  
  /**
  * @@@BUILDINFO@@@ AddOnePageBeforeAnyPage-AddSections-RenumberPages-SinglePageDocument.jsx !Version! Tue Jun 21 2016 07:19:25 GMT+0200
  */
  
  /*
      See discussion at InDesign forum:
      "Inserting Non-Numbered Pages into Existing Document"
      sarahcoppen Jun 20, 2016
      https://forums.adobe.com/message/8822592#8822592
  */
  
  app.scriptPreferences.userInteractionLevel = UserInteractionLevels.interactWithAll;
  app.doScript
      (
  
      addPages,
      ScriptLanguage.JAVASCRIPT,
      [],
      UndoModes.ENTIRE_SCRIPT,
      "Add pages before every page | SCRIPT"
  
      );
  
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  {
      if(app.documents.length == 0){return};
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      doc.documentPreferences.properties =
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          allowPageShuffle : false ,
          preserveLayoutWhenShuffling : true
      }
  
      pages = doc.pages;
      pagesLength = pages.length;
      var counter = 0;
  
      for(var n=1;n
  What I do not understand yet, is your numbering scheme for normal pages.
  If you use A master for automatic numbering can you you just add "-2" to the automatic number to achieve:
  etc.pp 1-2, 2-2, 3-2, 4-2.
  The Master has:
  
  On the normal page 4:
  
  My script will simply pick up the automatic pagination of master A.
  Master 'None' will apply to the new pages for notes.
  If you want to introduce the numbering of the pages 'notes', the script should be expanded to the addition of new sections and a different numbering scheme.
  Important notes:
  1. you can Cancel the entire script in a one-time action.
  2. I have developed and tested the script with InDesign CS6 v8.1.0, but it work also with CC 2015.3.
  3. If you want to print of pages or if you want to export the pages in PDF format, you must use absolute page numbers of the document like this:
  Example:
  + 2, + 4, + 6, + 8
  to print the pages 1 to 4 (and not the notes).
  If you want to print or export the notes 1 to 4, do it like this:
  + 1, + 3, + 5, + 7
  + 1 + 8 will give you the notes as well as regular pages 1 to 4.
  Numbers of absolute page in the PDF export dialog box:
  
  All the screenshots of my German version of InDesign.
  CS6 v8.1.0 Mac OS x 10.6.8.
  Kind regards
  Uwe