Nested set tables in select query "in the clause of" take long time

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  Scenario:
  
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  970773 wrote:
  Scenario:

  Table XYZ is created in detail a.
  After a year, the old data of the previous year could be moved to another schema. However in the other schema of the same table name would be used.

  For example

  A schema contains XYZ table with data from the year 2012
  Schema B contains XYZ table with data for the year 2011
  Table XYZ in the two schemas have an identical structure.

  So we can draw a single select query to read the data from the tables in an effective way.
  For example select * from XYZ so including date between October 15, 2011 to March 15, 2012.
  However, the data resides in 2 different schema altogether.

  Creating a view is an option.
  But my problem, there are ORM (Hibernate or Eclipse Top Link) layer between the application and the database.
  If the queries would be constituted by the ORM layer and are not generated by hand.
  So I can't use the view.

  Why not make the ORM as below?

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  -VIEW_BOTH is a real VIEW of Oracle

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  Settings (x.par)

  ************************

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  ******

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  Hello

  I have an EA of RDBMS Oracle 11.2.0.4.

  I ger the following error when I try to convert a data type LONG to type CLOB data thanks to a PL/SQL procedure:

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  cursor c_v
  is
  Select
  a.view_name as view_name
  Of
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  Start
  for r_v in c_v
  loop
  Start
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  -Do the SQL code of the view
  Select
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  in
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  Of
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  v_text_view_clob: = v_text_view_long;

  update of ohibo_views one
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  where
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  exception
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  end;
  end loop;
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  exception
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  end;
  /

  I get the error a specific record:

  View = VER_POLISMUTATIES_VW kan niet worden geconverteerd!

  ORA-06502: PL/SQL: digital error or value

  At looked the origina; Value of type LONG and it is indeed a "long" piece of text.

  However, CLOB has a restriction about 4G * db_block_size and LONG 2 G - 1 according to the documentation.

  I should be able with the method above to convert a LONG in CLOB.

  Anyone had a similar situation?

  Thanks in advance for advice how to solve.

  Kind regards

  PS: my apologies, I didn't know which group to post this discussion: database or PL/SQL.

  Good indeed, a link with the right explanation.

  I didn't know that there was such a function.

  Thank you!

  Kind regards

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