HOWTO replace permanent table "Temp"?

Hello

I join a project, but I'm too new to PL/SQL. A special procedure performs a search query. The approach can be summarized as:

* Build a SQL string based on values that are passed in the list parameters
Truncate a table permanently named Temp_SearchID
Run the dynamic SQL string that feeds the table Temp_SearchID (INSERT INTO Temp_SearchID SELECT...)
* Fill in the cursor returned by a SELECT statement to join other tables with the ID in Temp_SearchID

{color: #ff0000} * Q1. * {color} if the application workload is increased, there will be a higher concurrency and suggest that there are several concurrent calls to the above procedure. Since all of these calls has different settings and they want all compete to use the table of Temp_SearchID their own path, what would happen?

* {color: #ff0000} Q2. {color} * if using a permanent table of Temp_SearchID approach is not recommended, it is possible to empty the IDS in a cursor that is local to the procedure. Then do a SELECT associate this slider? In the world of SQL Server, this is possible by using the session Table or the temporary variable local tables. If it is possible to achieve with PL/SQL, can you please show me the syntax or point me to some code snippets?

I thank very you much for any help.

CarbonFiber wrote:

In the scenario, I look after, business rules are a little more complex. Write all of the SQL query in a string would indeed solve the problem. But it would be difficult to debug & test all of the query appear now as a large chain. I could resort to that. As I'm used to SQL Server, I would like to know if Oracle has a memory based structure, and then join it with other tables to produce the final result. I don't know PL/SQL pretty well write a query joining a cursor with a table. Can you show me the syntax of PL/SQL to do?

In a perspective of performance in Oracle the single, plain approach SQL would be probably the best, depending on other factors, like for example how to share the code generated SQL would then (or you will then generate literally thousands of different large SQL statement as part of your process).

As already discussed here you have the possibility of creating a GLOBAL TEMPORARY TABLE that contains the data that is visible only at the session that he uses in Oracle, but it is still read/write the data potentially to disk.

The subquery factoring approach described by David can also be a very good option, if the complexity of education is your main problem.

The memory in Oracle approach is a little more complex. You need to create a type, a collection on top of that type and then use the PL/SQL collection to use in the query, for example like this:

create or replace type t_qualified_id as object (
productid integer
);
/

create or replace type t_qualified_id_array as table of t_qualified_id;
/

create or replace procedure test_collection as
  in_memory_table t_qualified_id_array;
begin
  select t_qualified_id(object_id)
  bulk collect into in_memory_table
  from user_objects;

  for rec in (select object_id
  from table(in_memory_table) a
  inner join user_objects b
  on a.productid = b.object_id) loop
    null;
  end loop;
end;
/

or like this if you do not use the 'object' type, you can simply create an array of built-in number/integer type.

create or replace type t_qualified_id_array as table of integer;
/

create or replace procedure test_collection as
  in_memory_table t_qualified_id_array;
begin
  select object_id
  bulk collect into in_memory_table
  from user_objects;

  for rec in (select object_id
  from table(in_memory_table) a
  inner join user_objects b
  on value(a) = b.object_id) loop
    null;
  end loop;
end;
/

But you can see that there are subtle differences and you must study the SQL and PL/SQL Developer's guide for details. It becomes even more confused because you have in collection types Oracle PL/SQL and SQL collection types that differ in various aspects in terms of use.

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676 /.
http://sourceforge.NET/projects/SQLT-pp/

Published by: Randolf Geist Sep 22, 2008 18:57

A subquery factoring mentioned

Tags: Database

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