NOCOPY and Collection

Hi - I would like to create a package that stores collections with nested tables, functions (or procedures) should provide access to the nested tables.

I met some performance issues and came to the conclusion that memory structures (collections / nested tables) are passed by value (so over and over again copied) rather than spend them.

So I tried whether it is simply possible to transmit a collection via reference instead of create new duplicate memory - this is what I tried:

declare

type t is rendered

(

x number,

y varchar2 (100)

);

type t_tab is table of t;

type tt_tab is table of index t_tab by varchar2 (100);

TT tt_tab;

t_elem t;

t_tab_elem t_tab;

number of N_X;

procedure ttttx (v_index_in in varchar2, n_index_in in number, some t_ret_inout number nocopy) is

Start

t_ret_inout: = tt (v_index_in) (n_index_in) .x;

end;

tttt procedure (v_index_in in varchar2, n_index_in in numbers, t_ret_inout out nocopy t) is

Start

t_ret_inout: = tt (v_index_in) (n_index_in);

end;

ttt procedure (v_index_in in varchar2, t_ret_inout in out nocopy t_tab) is

Start

t_ret_inout: = tt (v_index_in);

end;

Start

TT ('A'): = new t_tab();

TT('A').extend (1);

TT ('A') (1) .x: = 1;

TT ('A') (1) there: = 'asdf ';

TTT ('A', t_tab_elem);

t_tab_elem (1) .x: = 99;

dbms_output.put_line (t_tab_elem (1) .x);

dbms_output.put_line (TT ('A') (1) .x);

THOMAS ('A', 1, t_elem);

t_elem.x: = 100;

dbms_output.put_line (t_elem.x);

dbms_output.put_line (TT ('A') (1) .x);

ttttx ('A', 1, n_x);

N_X: = 101;

dbms_output.put_line (N_X);

dbms_output.put_line (TT ('A') (1) .x);

end;

And unfortunately the result is

100

101

... so there is not a single reference, of course, these are all copies - I forgot something?

Thanks in advance

Best regards

Werner

Hi - I would like to create a package that stores collections with nested tables, functions (or procedures) should provide access to the nested tables.

Why? What PROBLEM are you trying to solve?

I met some performance issues and came to the conclusion that memory structures (collections / nested tables) are passed by value (so over and over again copied) rather than spend them.

Yes, they are - which is described in the section of the PL/SQL language about the NOCOPY hint doc:

Setting up of the PL/SQL Applications for performance

By default, OUT and IN OUT parameters are passed by value. The values of a IN OUT settings are copied before the delivery of the subprogramme.

During the execution of the subprogramme, temporary variables to maintain the output parameter values. If the subprogram exits normally, these values are copied to the actual parameters. If the subprogram exits with an unhandled exception, the original settings are unchanged.

When the parameters represent structures of large data such as collections, records and instances of object types, this reproduction slows down execution and uses memory. In particular, this overload applies to each call to a method of the object: temporary copies are made of all attributes, so that any changes made by the method are only apply if the method ends normally.

To avoid this overload, you can specify the NOCOPY trick, which allows the PL/SQL compiler to pass OUT and IN OUT parameters by reference. If the subprogram exits normally, the action is the same as usual. If the subprogramme leaves at the beginning with an exception, the values of OUT and IN OUT parameters (or the attributes of the object) can still change. To use this technique, check that the subroutine handles all exceptions.

The following example requires the compiler to pass IN OUT parameter v_staff by reference to avoid copying the input and output of the subprogramme varray:

Here is an example this quote.

The code you have posted works as expected:

TTT ('A', t_tab_elem);

t_tab_elem (1) .x: = 99;

dbms_output.put_line (t_tab_elem (1) .x);

dbms_output.put_line (TT ('A') (1) .x);

This first line calls the "ttt" procedure that uses only the OUTPUT parameters. Pass you a unitialized collection. This procedure done so that

t_ret_inout: = tt (v_index_in);

This line COPIES the element of the colllection 'tt' to the collection "t_ret_inout". Oracle doesn't use pointers and the "tt" reference is NOT that a parameter so don't have nothing to do with NOCOPY.

Then, you set 99 in the new collection that was returned.

Then you print the 99 of the new collection, and you print the "1" in the collection.

What else do you expect? You have two different collections.

The NOCOPY indicator prevents Oracle copy collections that are passed, be referred by, procedures or functions. As I've just shown the use of 'tt' by the "ttt" procedure is NOT being passed to, be referred by, the procedure.

Tags: Database

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