Are constants of body of the PL/SQL Package in the shared or private area

Based on that it is not clear to me if body Package PL/SQL constants are stored in the shared or private area.

http://docs.Oracle.com/CD/B28359_01/server.111/b28318/memory.htm

"PL/SQL program units and the Shared Pool

Oracle database treats PL/SQL program units (anonymous blocks, procedures, functions, packages and triggers in database) much the same way he treats the individual SQL statements. Oracle database allocates a shared area to hold the shape analyzed, compiled a program unit. Oracle database allocates a private space to hold values specific to the session who runs the program unit, including local, global and package variables (also known as the package is instantiated) and stamps of SQL execution. If more than one user is running the same program unit, a place unique and shared is used by all users, while each user runs a separate copy of his own private SQL area containing session-specific values.

The individual SQL statements contained in a PL/SQL program unit are processed as described in the previous sections. Despite their origins within a PL/SQL program unit, these SQL statements use a shared area to hold their analysed representations and a private space for each session, who executes the statement. »

I am also curious to know what are the differences in fine grain in a perspective of memory and performance (multisession) for the two examples below. One is more effective?

Example 1.

create or replace
package body
application_util
as

c_create_metadata constant varchar2 (6000): =...

procedure process_xxx
(
)
as
Start
...
end process_xxx;

end application_util;

vs.

Example 2.

create or replace
package body
application_util
as

procedure process_xxx
(
)
as

c_create_metadata constant varchar2 (6000): =...

Start
...
end process_xxx;

end application_util;

881398 wrote:

But I still have to ask because it seems still more particularly in example 1 that the constant can be attributed to the use that the actual value could be a pointer to a constant string value in a table of symbols or something related to the compilation unit. I'm always curious in a perspective of management of memory if there is a difference between the example 1 and example 2, and if one is better and why.

The storage is real, references to this storage internal to the PL/SQL engine. And irrelevant to the PL/SQL programmer.

This question is really a disagreement over the shape is better: example 1 or example 2. I prefer the 1 example, for readability, testability, etc., and so the question is where is the performance of the memory/differences and or is it just preference of developer.

I agree with rp0428 - he raised a very important point that it is a problem of scope and nothing else.

Basically is there any trade-off between using one shape on the other insofar as the performance and memory management?

Not really. Most runtime engines release not just actual system memory when a variable is out of range. the malloc() calls are expensive. Free() calls are expensive (and are not always the result in usable free memory which can be malloc'ed again).

Several execution engines use what is called a managed heap. A malloc is made of a new process when it is initialized. The heap memory / managed malloc'ed is adjacent. Pointer allocation of memory for this process is initially pointing to the base of the managed heap. As the process allocates / uses memory, the pointer is moved just advance in the managed heap, which indicates the HWM as such - the beginning of the 'free' memory in the heap. Allocation is sequential.

Reset of your variable execution, or releasing your runtime object, does not reset the HWM as other objects/variables can still be used and located after this place in the bunch. In this case set him free memory by releasing / resetting the language variables does not restore the kernel memory.

Memory management is a sophisticated process entirely processed by the engine running - and best left to the runtime engine. As you as a programmer do not explicitly control the memory management, it is not a good idea to try to write code that artificially attempt to use 'better' for the runtime engine memory management. The next version of the runtime of that aura of new features, optimizations and so on — and your interference in your code to get the "valorisation" of memory can happen just bite you not bad after an upgrade to execution.

Regarding the performance aspect - variable initialization is dependent on scope. In order to have a global scope means a one-time initialization, whereas a private scope (created each call) is a multiple unit. If the first is a little faster than the latter.

However, the performance differences are tiny - IMO too small to justify this as a valid consideration to spend in addition to the decision of functional design on what possibilities a variable or a constant need to have.

SQL> create or replace package FooLib1 as
  2          procedure Exec;
  3  end;
  4  /

Package created.

SQL>
SQL> create or replace package body FooLib1 as
  2          const1  constant varchar2(32767) := rpad('-',10000,'-');
  3
  4          procedure Exec is
  5                  var1    varchar2(32767);
  6          begin
  7                  var1 := const1;
  8          end;
  9  end;
 10  /

Package body created.

SQL>
SQL>
SQL> create or replace package FooLib2 as
  2          procedure Exec;
  3  end;
  4  /

Package created.

SQL>
SQL> create or replace package body FooLib2 as
  2          procedure Exec is
  3                  const1  constant varchar2(32767) := rpad('-',10000,'-');
  4                  var1    varchar2(32767);
  5          begin
  6                  var1 := const1;
  7          end;
  8  end;
  9  /

Package body created.

SQL>
SQL> set timing on
SQL> exec for i in 1..100000 loop FooLib1.Exec; end loop;

PL/SQL procedure successfully completed.

Elapsed: 00:00:00.28
SQL> exec for i in 1..100000 loop FooLib2.Exec; end loop;

PL/SQL procedure successfully completed.

Elapsed: 00:00:00.74
SQL>

A second difference 0.0000046 in a single execution for FooLib.Exec between the use of package for the constant scope, against increased private. Which means that the issue of the scope is not a decision of the performance. Not when improving performance overhead is 0,0046 millisecs.

Tags: Database

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Denes Kubicek
-------------------------------------------------------------------
http://deneskubicek.blogspot.com/
http://www.Opal-consulting.de/training
http://Apex.Oracle.com/pls/OTN/f?p=31517:1
-------------------------------------------------------------------

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Source

Source used	current value
Type of source	source
	[textstatic ] [Column DB] [SQL] query [PL/SQL] expression [Body of the PL/SQL function]
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Are constants of body of the PL/SQL Package in the shared or private area

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