Refcursor in the procedure

Hi all

There will be no effect in performance if we declare refcurosr with suspicion NOCOPY parameter in a Stored procedure procedure/package?

AFAIK variable refcursor who will make reference to the calling environment will hold just pointer not data and so avoid a NOCOPY effect.

Thank you!!

DS says:

One of my senior team members asked me to NOCOPY in all existing procedures where refcursor is returned as a parameter in my output project.

I told him that this will not add any performance improvement and has no effect.

I did it, because I was forced to do so.

Want to just check and take the advice from here in this forum.

I still have the document (in e-mails and in the procedure itself at the top) all these changes so that the future code-reviewers know EXACTLY why this change has been made and who authorized it. Probably you are asking your "senior" you say the reasons to support the change that they requested; You should document those as well.

Sounds like your "senior" team member is not so superior after all. You can use this as a topic of discussion in your dev group.

See the doc of the PL/SQL language.

http://docs.Oracle.com/CD/B28359_01/AppDev.111/b28370/tuning.htm#i48500

Calls to PL/SQL Tuning subprogramme with NOCOPY hint

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.

Note the reference to the "large data structures. As you already know a REFCURSOR isn't a large data structure, so will not use NOCOPY.

The most important side effect is that, as noted in the last paragraph above, the characteristics of the 'exit' are modified if you use NOCOPY.

Point out that the last clause in your "senior": ENSURE THAT THE subprogram MANAGES all THE EXCEPTIONS.

Normally (i.e. without using NOCOPY) a REFCURSOR lucifera is a parameter OUT will NOT have a value if the procedure stops with an exception if the caller is unable to use it eventually. Maybe this isn't the case if you use NOCOPY.

Generally however, the use of NOCOPY would simply be an amendment unnecessary, but harmless.

Tags: Database

Similar Questions

2 refcursors within the same procedure using
Hello
Can we use 2 refcursors within the same procedure. This may seem strange. But I have a script to do so - one to dynamically check for some validations and another to return a result set.
Yes, pass by the example below.

CREATE OR REPLACE PACKAGE CURSPKG AS
TYPE T_CURSOR IS REF CURSOR;
PROCEDURE (EMPCURSOR ON T_CURSOR OPEN_TWO_CURSORS,
DEPTCURSOR ON T_CURSOR);
END CURSPKG;
/
CREATE OR REPLACE PACKAGE BODY CURSPKG AS
PROCEDURE (EMPCURSOR ON T_CURSOR OPEN_TWO_CURSORS,
DEPTCURSOR ON T_CURSOR)
IS
V_CURSOR1 T_CURSOR;
V_CURSOR2 T_CURSOR;
BEGIN
V_CURSOR1 OPEN FOR SELECT * FROM EMP;
V_CURSOR2 OPEN FOR SELECT * FROM THE DEPARTMENT;
EMPCURSOR: = V_CURSOR1;
DEPTCURSOR: = V_CURSOR2;
END OPEN_TWO_CURSORS;
END CURSPKG;
/

I hope that it would be useful.

How to return rows by using the procedure?

Example: There are 3 areas: A, B, C and each region has some people.
create table person (name varchar2 (2), area varchar2 (2));
insert into values('A1','A') of the person; -1st rank
insert into values('A2','A') of the person; -line 2
insert into values('A3','A') of the person; -tier 3
insert into values('A4','A') of the person; -tier 4
insert into values('B1','B') of the person; -tier 5
insert into values('C1','C') of the person; -tier 6
insert into values('C2','C') of the person; -line 7
result as follows:
A, B AND C
--------------
A1 B1 C1
A2 C2
A3
A4
If we ' select * from person ", then we had all the lines.
I want to now choose volunteers in all areas, the rule is to pick one person from each region ordered, until that N people are selected. If N = 6, the sequence is
A1, A3, A2, B1, C1, C2
and want to return lines 1,5,6,2,7,3 (order of lines is not important) of the person.
How to create a procedure for this? And I want to return as rows returned by a select phrase. (can be easily filled in a DataTable object and then be used in a program).
Thank you!!

Hello

2985493 wrote:

Thank you. Could you write a procedure to do the job? This is just an example, real choice rule is complicated enough to be used by the procedure and the cursor. I wonder how do to write a procedure returns the result as a select phrase.

Here's one way:

VARIABLE c REFCURSOR

CREATE OR REPLACE PROCEDURE top_by_area

(csr ON SYS_REFCURSOR

, n_to_return IN PLS_INTEGER: = 6

)

IS

BEGIN

OPEN FOR CSR

WITH got_area_num AS

(

SELECT name, area

OF the person

ORDER BY ROW_NUMBER () (PARTITION BY AREA

ORDER BY name

)

area

)

SELECT name, area

ROWNUM AS r_num

OF got_area_num

WHERE ROWNUM<=>

ORDER BY r_num

;

END top_by_area;

/

DISPLAY ERRORS

EXEC top_by_area (: c);

PRINTING: c

PRINT the output of the command, given your sample data is:

R_NUM DOMAIN NAME

---- ---- --------

A1 1

B1 B 2

C1, C 3

A2 4

C2 C 5

A3 A 6

It's just a way to create and test the procedure. I don't know how you plan to use it.

issues related to the parameter in the procedure

Hi all
I have a procedure which the code is given below:
create or replace PROCEDURE seods01.get_cert_tx_lot_tmp (acct_alt_id_in in VARCHAR2
, acct_alt_id_cntx_cde_in IN VARCHAR2 default 'COLA account number.
, ibd_id_in IN INTEGER
qry_rslt_out to sys_refcursor)
IS
BEGIN
OPEN FOR Qry_rslt_out
SELECT L.tx_lot_seq_nbr
L.hld_prd_dte
L.orig_purc_dte
L.tx_lot_amt
L.updt_tx_lot_amt
L.tran_desc_txt
OF v_acct_alt_id A
v_cd_tx_lot L
WHERE A.acct_alt_id = acct_alt_id_in
AND A.acct_alt_id_cntx_cde = acct_alt_id_cntx_cde_in
AND A.ibd_id = ibd_id_in
AND L.eods_acct_id = A.eods_acct_id;
EXCEPTION
WHILE OTHERS THEN
dbms_output.put_line(SQLCODE||) SQLERRM);
END get_cert_tx_lot_tmp;
now when I run the SP in the following way it works fine:
VAR C1 REFCURSOR
EXECUTE SEODS01.get_cert_tx_lot_tmp ('004000000000000093108026740', 'Number of COLA account', '1',: C1);
PRINT C1
When I try to ignore this value by default setting, then it is throwing ' wrong number or types of arguments "error
VAR C1 REFCURSOR
EXECUTE SEODS01.get_cert_tx_lot_tmp ('004000000000000093108026740 ', ' 1',: C1);
PRINT C1
and when I tried to put this as null or "then it gives me no results. only way through which I can produce results of this procedure without giving the default parameter is the name of the column with the value of the parameter as follows:
VAR C1 REFCURSOR
RUN SEODS01.get_cert_tx_lot_tmp (acct_alt_id_in = > '004000000000000093108026740', ibd_id_in = > '1', qry_rslt_out = >: C1);
PRINT C1
but the condition is that we do not want our consumers to put names of columns when they do not pass the default value setting, I hope that there should be a way to do it. Could someone help me please on this issue.

Hello

If you want to use positional notation, then you can only omit parameters by default when they are at the end of the parameter list. In your case, this would mean

(acct_alt_id_in in VARCHAR2

ibd_id_in in FULL

qry_rslt_out ON sys_refcursor

acct_alt_id_cntx_cde_in IN VARCHAR2 default 'COLA account number')

Or you can put the procedure in a package and overload

PROCEDURE seods01.get_cert_tx_lot_tmp

(acct_alt_id_in in VARCHAR2

acct_alt_id_cntx_cde_in IN VARCHAR2

ibd_id_in in FULL

qry_rslt_out to sys_refcursor)

PROCEDURE seods01.get_cert_tx_lot_tmp

(acct_alt_id_in in VARCHAR2

ibd_id_in in FULL

qry_rslt_out to sys_refcursor)

In the procedure without the acct_alt_id_cntx_cde_in parameter, you can call the other version and provide the default value.

Concerning

Marcus

Using the procedure to display the table of multiple data

Hi, I need help for the procedure in oracle
I want to create the procedure to display the table of multiples with sample plan
with a parameter imployee_id to display an employee_id, name, function, start_date, end_date
IAM using this query to select more than one table
SELECT e.employee_id, e.first_name, j.job_title, h.start_date, h.end_date
E EMPLOYEES
JOIN j jobs
ON j.job_id = e.job_id
JOIN the job_history:
ON h.employee_id = e.employee_id
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Blu and Billy showed you the 'real' solution. You can display the data returned by a cursor ref in SQL Developer, too:

http://www.thatjeffsmith.com/archive/2011/12/SQL-Developer-tip-viewing-refcursor-output/

Yet as a duty for a beginner is generally do not have the expected solution. Usually, teachers want to see you using a LOOP and dbms_output. something like

DECLARE

Xy CURSOR IS

SELECT whatever

As much as;

BEGIN

FOR r IN xy LOOP

dbms_output.put_line (r.col1 |' # ' | r.col2);

END LOOP;

END;

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Hello
I have a simple procedure that gives me the list of dates and dates
I need to get the dates dates separated by commas
I don't know if this can be done directly by making a loop on the refcursor or I have to go pick her up in a file/table and then concatenate with comma, or is there anything else that can be done.
I tried some stuff like below

PS help out me
the procedure is that returns the list of dates

CREATE OR REPLACE procedure SALUSER.prm_sp_rpt_payslip_lop_dates(p_empid in int,p_tran_year in int,p_tran_month in integer,o_dates out sys_refcursor)
as
begin
 open o_dates for select  to_char(PHL_LOP_FROM,'DD-Mon-YYYY'),to_char(PHL_LOP_TO,'DD-Mon-yyyy') 
                 from prm_h_lop
                 where phl_emp_id=p_empid
                   and phl_tran_year=p_tran_year
                   and phl_Tran_month=p_tran_month;

               
 end;
/

I need my o/p as

dates :<date1>,<date2>...etc

Kind regards

Maybe sth. as

SQL>  var cur refcursor

SQL>  declare
 cr sys_refcursor;
 procedure prm_sp_rpt_payslip_lop_dates (cr in out sys_refcursor)
 as
 begin
   open cr for select hiredate from emp;
 end prm_sp_rpt_payslip_lop_dates;
begin
 prm_sp_rpt_payslip_lop_dates(cr);
 open :cur for select 'Dates: ' || column_value dates from xmltable('string-join(//text(), ", ")' passing xmltype(cr));
end;
/
PL/SQL procedure successfully completed.

SQL>  print cur

DATES
--------------------------------------------------------------------------------
Dates: 17-Dec-1980, 20-Feb-1981, 22-Feb-1981, 02-Apr-1981, 28-Sep-1981, 01-May-1
981, 09-Jun-1981, 19-Apr-1987, 17-Nov-1981, 08-Sep-1981, 23-May-1987, 03-Dec-198
1, 03-Dec-1981, 23-Jan-1982                                                     

1 row selected.

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VAR C1 REFCURSOR
EXECUTE SEODS01.get_cert_tx_lot_tmp ('004000000000000093108026740', 'Number of COLA account', '1',: C1);

VAR C1 REFCURSOR
RUN SEODS01.get_cert_tx_lot_tmp (acct_alt_id_in = > '004000000000000093108026740', ibd_id_in = > '1', qry_rslt_out = >: C1);

Refcursor in the procedure

Calls to PL/SQL Tuning subprogramme with NOCOPY hint

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