Regarding usage of constants while using bind variables

Hi All,
Can some one please help me out of this situation?
I wrote a query in a package in which i am using bind variables for faster execution of the query in loops.
In the above said scenario i am trying to insert a set of data into a table say 'A' by selecting from some other table say 'B'. But i also need to insert some data which is constant.
Something like this:
constant_val varchar2(1):='N';
for i in 1 .. tab.count
loop
insert into A(Col1, Col2) values (select constant_val, B.value from B where B.value = tab(i));
end loop;
I wrote the query using bind variables in the manner:
for i in 1 .. tab.count
loop
execute immediate 'insert into A(Col1, Col2) values (select constant_val, B.value from B where B.value = :1)' using tab(i);
end loop;
This compiles, but does not run ... error said is PLSQL statement not properly ended.
I also tried the option of giving constant_value in the using clause and replacing the same in query using a bind variable. It still doesnt work.
Is there someway by which i can squeeze in the constant value also. Can someone please advise me on this?
Thanks in advance,
Praveen G S

but i was told that if i succeed
in reducing the hard parsing of queries .. i will get
better performance results .. Would i say too, at least for OLTP like systems
but if i cant or rather dont have to use it while
looping PLSQL tables and accessing data from other
tables using this data ... then what do we use it
for?? PL SQL is capable of bulk operations, so loop is less performant method to process data, however, if you can't do it bulk - for whatever reasons - do it in loop.
My remark was related mostly to dynamic sql, as shoblock already said, it seems to be no reason in your code to use dynamic sql, if you can use static...
What i not understand as well, why do you select a value from the table, if this value is already in your collection?
values (select constant_val, B.value from B where B.value = :1)' using tab(i);Best regards
Maxim

Similar Messages

High number of execution while using bind variables

Hi,
The below query is going for 79000 executions when bind variables are used.
Select COUNT ( InID) From InD   PPR BO95_PPR where IND.PPR = PPR. PPRName AND   ( ( ( ( ( ( AGD = :1 ) AND ( AGUD is null ) ) AND ( MW is null ) ) AND ( ( ( Status = :2 ) OR ( Status = :3 ) ) ) ) AND BD = :4 ) )
Bind variable values are as follows
:1 = 10
:2 = Down
:3 = Run
:4 = 10
| Id | Operation                     | Name                 | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT              |                      |     1 |    54 |    74   (3)| 00:00:01 |
|   1 | SORT AGGREGATE               |                      |     1 |    54 |            |          |
|   2 |   NESTED LOOPS                |                      | 79543 | 4194K|    74   (3)| 00:00:01 |
|   3 |    TABLE ACCESS BY INDEX ROWID| PPR     |     1 |    15 |     1   (0)| 00:00:01 |
|* 4 |     INDEX RANGE SCAN          | IDX_PPR_BD     |     1 |       |     1   (0)| 00:00:01 |
|   5 |    INLIST ITERATOR            |                      |       |       |            |          |
|* 6 |     INDEX RANGE SCAN          | IDX_InD_ASABMP | 79543 | 3029K|    73   (3)| 00:00:01 |
------------------------------------------------------------------------------------------------------When I replace the bind variables with hard coded values, the row returned is 29000 only.
Why is it different?
Thanks

Huh?
How are you comparing 79000 executions with 29000 rows?
Your question:
a). Doesn't make sense
b). Lacks information (version of Oracle, doesn't show how you determine 79,000 executions and 29,000 rows)
c). Lacks information about how the query is being submitted/executed - the client determines how many times it's executed, and bind variables wouldn't impact this.
John

Performance when using bind variables

I'm trying to show myself that bind variables improve performance (I believe it, I just want to see it).
I've created a simple table of 100,000 records each row a single column of type integer. I populate it with a number between 1 and 100,000
Now, with a JAVA program I delete 2,000 of the records by performing a loop and using the loop counter in my where predicate.
My first JAVA program runs without using bind variables as follows:
loop
stmt.executeUpdate("delete from nobind_test where id = " + i);
end loop
My second JAVA program uses bind variables as follows:
pstmt = conn.prepareStatement("delete from bind_test where id = ?");
loop
pstmt.setString(1, String.valueof(i));
rs = pstmt.executeQuery();
end loop;
Monitoring of v$SQL shows that program one doesn't use bind variables, and program two does use bind variables.
The trouble is that the program that does not use bind variables runs faster than the bind variable program.
Can anyone tell me why this would be? Is my test too simple?
Thanks.

[email protected] wrote:
I'm trying to show myself that bind variables improve performance (I believe it, I just want to see it).
I've created a simple table of 100,000 records each row a single column of type integer. I populate it with a number between 1 and 100,000
Now, with a JAVA program I delete 2,000 of the records by performing a loop and using the loop counter in my where predicate.
Monitoring of v$SQL shows that program one doesn't use bind variables, and program two does use bind variables.
The trouble is that the program that does not use bind variables runs faster than the bind variable program.
Can anyone tell me why this would be? Is my test too simple?
The point is that you have to find out where your test is spending most of the time.
If you've just populated a table with 100,000 records and then start to delete randomly 2,000 of them, the database has to perform a full table scan for each of the records to be deleted.
So probably most of the time is spent scanning the table over and over again, although most of blocks might already be in your database buffer cache.
The difference between the hard parse and the soft parse of such a simple statement might be negligible compared to effort it takes to fulfill each delete execution.
You might want to change the setup of your test: Add a primary key constraint to your test table and delete the rows using this primary key as predicate. Then the time it takes to locate the row to delete should be negligible compared to the hard parse / soft parse difference.
You probably need to increase your iteration count because deleting 2,000 records this way probably takes too short and introduces measuring issues. Try to delete more rows, then you should be able to spot a significant and constant difference between the two approaches.
In order to prevent any performance issues from a potentially degenerated index due to numerous DML activities, you could also just change your test case to query for a particular column of the row corresponding to your predicate rather than deleting it.
Regards,
Randolf
Oracle related stuff blog:
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/

Report Using Bind Variables

Hey Everyone,
I'm having a bit of trouble creating a report. I need the FROM part of the code to use bind variables. I have come up with this peice of code below but im getting the following error:
failed to parse SQL query:
ORA-06550: line 1, column 8:
PLS-00103: Encountered the symbol "" when expecting one of the following:
begin function package pragma procedure subtype type use
form
current cursor
The symbol "" was ignored.
ORA-06550: line 2, column 24:
PLS-00103: Encountered the symbol "" when expecting one of the following:
begin function package pragma procedure subtype type use
form
current
Can anyone see where im going wrong?
Thanks in advance,
-N.S.N.O.
Code*
DECLARE
x VARCHAR2 (4000);
BEGIN
x := x || 'select *';
x := x || 'from ';
x := x || :p13_schema;
x := x || '.ddl_log@';
x := x || :p13_db_name;
x := x || '_DBAAPEX.TNTEWW.COM';
RETURN (x);
END;

Hey Roel and Daylocks,
After getting frustrated for a while i deleted the page and started again. I put in the exact same code and it worked just how i wanted in the first place :S
The only thing i did different is when i was creating the report region the first time around i used a normal SQL query, For Example:
select sysdate from dual;
Then i modified it to
DECLARE
x VARCHAR2 (4000);
BEGIN
x := x || 'select ';*
x := x || 'from ';
x := x || :p14_schema;
x := x || '.ddl_log@';
x := x || :p14_db_name;
x := x || '_DBAAPEX.TNTEWW.COM';
RETURN (x);
END;
Whereas on the second attempt i used the peice of code in question straight away. Its been a bit of a frustrating morning because i used a similar peice of code for a different application, nevermind tho :)
Thanks for your replys, much appreciated.
-N.S.N.O.

Using Bind Variable in a SELECT

Hi,
I'm trying to build up my SQL query at run-time using bind variables and in the Oracle® Fusion Middleware Fusion Developer's Guide for Oracle Application Development Framework 11g Release 1 (11.1.1) it says that 'After defining the bind variables, the next step is to reference them in the SQL statement. While SQL syntax allows bind variables to appear both in the SELECT list and in the WHERE clause, you'll typically use them in the latter context, as part of your WHERE clause.'.
However, when I try to use the bind variables in my SELECT list because I've had to set a type for the variable to String the variable gets inserted with inverted commas either side e.g. SELECT 'Service' FROM TestTable. Is it possible to use bind variables to insert a value into my select list without these inverted commas around it?
Thanks in advance,
Tom

OK, thanks for your response. Do you know of a way then where I can control my SELECT parameters programmatically? I'm currently trying to do it using the information in the chapter '35.9 Using Programmatic View Objects for Alternative Data Sources' from the Oracle® Fusion Middleware Fusion Developer's Guide for Oracle Application Development Framework 11g Release 1 (11.1.1). I think I'm part way there, would this be the correct way of acheiving what I want?
Cheers, Tom

Trying to pass array to stored procedure in a loop using bind variable

All,
I'm having trouble figuring out if I can do the following:
I have a stored procedure as follows:
create procedure enque_f826_utility_q (inpayload IN f826_utility_payload, msgid out RAW) is
enqopt dbms_aq.enqueue_options_t;
mprop dbms_aq.message_properties_t;
begin
dbms_aq.enqueue(queue_name=>'f826_utility_queue',
enqueue_options=>enqopt,
message_properties=>mprop,
payload=>inpayload,
msgid=>msgid);
end;
The above compiles cleanly.
The first parameter "inpayload" a database type something like the following:
create or replace type f826_utility_payload as object
2 (
3 YEAR NUMBER(4,0),
4 MONTH NUMBER(2,0),
83 MUSTHAVE CHAR(1)
84 );
I'd like to call the stored procedure enque_f826_utility_q in a loop passing to it
each time, new values in the inpayload parameter.
My questions are:
First, I'm not sure in php, how to construct the first parameter which is a database type.
Can I just make an associative array variable with the keys of the array the same as the columns of the database type shown above and then pass that array to the stored procedure?
Second, is it possible to parse a statement that calls the enque_f826_utility_q procedure using bind variables and then execute the call to the stored procedure in a loop passing new bind variables each time?
I've tried something like the following but it's not working:
$conn = oci_pconnect (....);
$stmt = "select * from f826_utility";
$stid = oci_parse($conn, $sqlstmt);
$r = oci_execute($stid, OCI_DEFAULT);
$row = array();
$msgid = "";
$enqstmt = "call enque_f826_utility_q(:RID,:MID)";
$enqstid = oci_parse($conn, $sqlstmt);
oci_bind_by_name($enqstid, ":RID", $row); /* line 57 */
oci_bind_by_name($enqstid, ":MID", $msgid);
while ($row = oci_fetch_array($stid, OCI_RETURN_NULLS+OCI_ASSOC))
++$rowcnt;
if (! oci_execute($enqstid)) /* line 65 */
echo "Error";
exit;
When I run this, I get the following:
PHP Notice: Array to string conversion in C:\Temp\enqueue_f826_utility.php on l
ine 57
Entering loop to process records from F826_UTIITY table
PHP Notice: Array to string conversion in C:\Temp\enqueue_f826_utility.php on l
ine 65
PHP Warning: oci_execute(): ORA-06553: PLS-306: wrong number or types of argume
nts in call to 'ENQUE_F826_UTILITY_Q' in C:\Temp\enqueue_f826_utility.php on lin
e 65
PHP Notice: Undefined variable: msgnum in C:\Temp\enqueue_f826_utility.php on l
ine 68
Error during oci_execute of statement select * from F826_UTILITY
Exiting!

Thanks for the reply.
I took a look at this article. What it appears to describe is
a calling a stored procedure that takes a collection type which is an array.
Does anyone from Oracle know if I can pass other database type definitions to a stored procedure from PHP?
I have a type defined in my database similar to the following which is not
an array but a record of various fields. This type corresponds to a payload
of an advanced queue payload type. I have a stored procedure which will take as it's input, a payload type of this structure and then enqueue it to a queue.
So I want to be able to pass a database type similar to the following type definition from within PHP. Can anyone from Oracle verify whether or not this is possible?
create or replace type f826_utility_payload as object
YEAR NUMBER(4,0),
MONTH NUMBER(2,0),
UTILITY_ID NUMBER(10,0),
SUBMIT_FAIL_BY VARCHAR2(30),
MUSTHAVE CHAR(1)
);

How to use bind variables in the following query

CREATE OR REPLACE PROCEDURE MMDB.test IS
sel_qtn VARCHAR2 (10);
CURSOR PT_QUANTITY IS select * from mmdb.product_tree WHERE QUANTITY_CHECK ='E'
AND run_id = 100
a PT_QUANTITY%ROWTYPE;
BEGIN
FOR i IN PT_QUANTITY
loop
sel_qtn := i.quanttity-1;
While sel_qtn>=1
loop
insert into mmdb.product_tree (BILLING_ACCOUNT_NO ,S_CODE) values (i.BILLING_ACCOUNT_NO ,i.S_CODE||'E');
sel_qtn :=sel_qtn -1;
End loop;
commit;
end;

Don't duplicate threads: How to use bind variables in the following query

How to use Bind Variables in Essbase data control

Hi,
I am trying to use Bind Variables in MDX query while creating the Essbase Data Control. I have used the below query with the Bind Variable.. this query is working in Essbase admin console..but it is throwing error (*Invalid MDX Query)* while creating Essbase Datacontrol in JDeveloper.
MDX Query : SELECT {[Measures].Msr_2} ON COLUMNS, [Time].Children ON ROWS FROM cube
where ($name)
Could any body suggest me on how to use bind variables with Essbase Data control.
Thanks,
Swathi

Hello Swathi, can you please help me how you created Essbase DataControl? Also were you able to figure out this?
Thanks, Praveen.

How to use bind variable

Hi,
I have the below cursor 1 which is working already.For my requirement i want to use bind variable like second cursor.But its telling Bind Variable "p_col_list" is NOT DECLARED.Please any onehelp me on this.
How to use bind variable Here.
Cursor1:
DECLARE
emp_cv sys_refcursor;
iid NUMBER := 1;
i_sql varchar2(100);
p_col_list varchar2(2000) := 'aaa,bbb,ccc,ddd';
BEGIN
i_sql := 'select '''||REPLACE(p_col_list, ',', ''',''')||''' from dual '||CHR(10) ;
dbms_output.put_line(i_sql);
OPEN emp_cv FOR i_sql ;
END;
Cursor2:
DECLARE
emp_cv sys_refcursor;
iid NUMBER := 1;
i_sql varchar2(100);
p_col_list varchar2(2000) := 'aaa,bbb,ccc,ddd';
BEGIN
i_sql := 'select '''||REPLACE(:p_col_list, ',', ''',''')||''' from dual '||CHR(10) ;
dbms_output.put_line(i_sql);
OPEN emp_cv FOR i_sql using p_col_list;
END;

hello,
the reports parameterform capabilities are limited. if you want
to create sophisticated parameterforms, you should do that with
oracle forms or html forms.
regards,
the oracle reports team --pw

BUG ? : ADF creating extra VO instance using bind variables in a LOV query

ADF 11.1.1.1.0
After "playing around" with bind variables Setting bind variables in view objects for LOV I've come across something strange that I've reproduce using the HR schema and tables Employees and Departments. Its a bit long but here goes :
Using the HR schema tables departments and employeesI'm trying to create a LOV (selectOneChoice) for the
employee department, the LOV having a bind variable that limits the values returned in this case returning only DepartmentId = 50
I've create a VO lovDepartment (not based on an EO) with the following query :
SELECT Departments.DEPARTMENT_ID,
       Departments.DEPARTMENT_NAME,
       Departments.MANAGER_ID,
       Departments.LOCATION_ID
FROM DEPARTMENTS Departments
where DEPARTMENT_ID = :pDeptIdA LOV has been defined on the DepartmentId attribute of the EmployeesView.
The lovDepartmentImpl overrides the executeQueryForCollection to set the bind variable value.
    @Override
    protected void executeQueryForCollection(Object object, Object[] object2,
                                             int i) {
        setNamedWhereClauseParam("pDeptId", "50");
        super.executeQueryForCollection(object, object2, i);
    }When using an ADF form to create a new employee the DepartmentId lov is empty.
Enabling SQL tracing shows the following :
[370] _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1_0 ViewRowSetImpl.doSetWhereClause(-1, pDeptId, null)
[371] _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1_0 ViewRowSetImpl.execute caused params to be "un"changed
[372] Column count: 4
[373] _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1_0 ViewRowSetImpl.doSetWhereClause(-1, pDeptId, null)
[374] _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1 ViewRowSetImpl.setNamedWhereClauseParam(pDeptId, 50)
[375] ViewObject: _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1 Created new QUERY statement
[376] _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1>#q computed SQLStmtBufLen: 235, actual=195, storing=225
[377] SELECT Departments.DEPARTMENT_ID,
       Departments.DEPARTMENT_NAME,
       Departments.MANAGER_ID,
       Departments.LOCATION_ID
FROM DEPARTMENTS Departments
where DEPARTMENT_ID = :pDeptId
[378] Bind params for ViewObject: _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1
[379] For RowSet : _LOCAL_VIEW_USAGE_model_EmployeesView_lovDepartment1_0
[380] Binding null of type 12 for "pDeptId"
[381] No Resource Bundle found but null value id:LOV_DepartmentId_LOVUIHints_NullValueId is defined in an ListBinding Definition.It would seem that 2 lovDepartment instances are used one at line 370 LOCALVIEW_USAGE_model_EmployeesView_lovDepartment1_0
and one at line 374 LOCALVIEW_USAGE_model_EmployeesView_lovDepartment1
The one at line 374 LOCALVIEW_USAGE_model_EmployeesView_lovDepartment1 gets the variable bound at line 374
however LOCALVIEW_USAGE_model_EmployeesView_lovDepartment1_0 gets a null value and would explain the empty LOV
Can anybody explain what is happening here ? (and how to use bind variables in LOV queries)
Regards
Paul
(bump)
Edited by: Paul (MITsa) on Jul 14, 2009 10:46 AM
I've now tried all types of LOV from ChoiceList to Radio groupe by testing the application module - none of them work.....
Edited by: Paul (MITsa) on 14-Jul-2009 22:52

when you rinvoke executeQueryForCollection the bind variables are allready set and they exist in Object[] object2 method parameters.
in order to change them you need something like:
private void changeGenericBindVariable(Object[] params, String paramName, Object paramValue) {
for (int i = 0; i < params.length; i++) {
if (paramName.equals(((Object[])params)[0].toString()))
((Object[])params[i])[1] = paramValue;
* executeQueryForCollection - overridden for custom java data source support.
protected void executeQueryForCollection(Object qc, Object[] params,
int noUserParams) {
changeGenericBindVariable(params, "pDeptId", "50")
super.executeQueryForCollection(object, object2, i);
But its better to set bind variables before you executeQueryForCollection. like when you invoke LOV.
For cascading LOVs and the problems i have check:
[http://adfbugs.blogspot.com/2009/07/jdeveloper-11-r1-cascading-lov-bugs.html]

Using bind variables in VB

Good day to all,
I have a question related to VB.
Is there any way to use Bind variables in VB, or any other way, that my same query will not parse every time in Oracle just for a little difference in variable field..
Regards
Ans

You'd use OracleParameters. I dont do VB.NET, but here's a c# example you should be able to easily convert.
Hope it helps,
Greg
        using (OracleConnection con = new OracleConnection("user id=scott;password=tiger;data source=orcl"))
            con.Open();
            using (OracleCommand cmd = new OracleCommand("", con))
                cmd.CommandText = "insert into emp (empno, ename) values (:e1, :e2)";
                cmd.Parameters.Add(new OracleParameter("e1",OracleDbType.Int32,0,1234,ParameterDirection.Input));
                cmd.Parameters.Add(new OracleParameter("e2",OracleDbType.Varchar2,4,"KING",ParameterDirection.Input));
                cmd.ExecuteNonQuery();
                Console.WriteLine("done");
        }

Problem in using bind variables.

I am using following query in my procedure:
In 1st Query I am getting the result.
And in 2nd Query when i am using bind variable i got error that " Table or View Does not Exist"
---------1st query
OPEN p_document_details FOR
SELECT ddd.document_code,
ddd.document_description,
ddd.document_level
FROM dms_document_details ddd,
dms_document_group_details ddgd
WHERE UPPER(ddd.document_code) = UPPER(ddgd.document_code)
AND UPPER(ddgd.document_group_code) = UPPER(p_doc_group_code)
AND UPPER(ddgd.scheme_type) = UPPER(p_scheme_type)
AND UPPER(ddgd.process_name) = UPPER(p_process_name) ;
---------2nd query
v_search_sql :=
' SELECT ddd.document_code, '
|| ' ddd.document_description, '
|| ' ddd.document_level '
|| ' FROM dms_document_details ddd, dms_document_group_details ddgd '
|| ' WHERE UPPER(ddd.document_code) = UPPER(ddgd.document_code) '
|| ' AND UPPER(ddgd.document_group_code) = :a '
|| ' AND UPPER(ddgd.scheme_type) = :b '
|| ' AND UPPER(ddgd.process_name) = :c ' ;
Please provide any solution.
Thanks in advance.
AgrawalV

---------2nd query
v_search_sql :=
' SELECT ddd.document_code, '
| ' ddd.document_description, '
|| ' ddd.document_level '
|| ' FROM dms_document_details ddd,
dms_document_group_details ddgd '
|| ' WHERE UPPER(ddd.document_code) =
UPPER(ddgd.document_code) '
|| ' AND UPPER(ddgd.document_group_code)
= :a '
|| ' AND UPPER(ddgd.scheme_type) = :b '
|| ' AND UPPER(ddgd.process_name) = :c ' ;
Hi!
Try to use chr(10) before from clause. Hope this will solve your problem --
v_search_sql :=
' SELECT ddd.document_code, '
|| ' ddd.document_description, '
|| ' ddd.document_level '
||chr(10)
|| ' FROM dms_document_details ddd, dms_document_group_details ddgd '
||chr(10)
|| ' WHERE UPPER(ddd.document_code) = UPPER(ddgd.document_code) '
|| ' AND UPPER(ddgd.document_group_code) = :a '
|| ' AND UPPER(ddgd.scheme_type) = :b '
|| ' AND UPPER(ddgd.process_name) = :c ' ;Regards.
Satyaki De.

What's disadvantages when using bind variables always in java?

Hello everyone .. Could someone tell me what's the disadvantage when using bind variable in java ? I heard it somecases since before.. Thanks in advance!

99% of the time, you should be using bind variables. If you have columns which are highly skewed, however, you may want to consider using literals (assuming CURSOR_SHARING=EXACT), since that may allow the CBO to make a better decision.
If you have an orders table, for example, you may have a status column that specifies whether the order is complete, in transit, or new. If you've been running for a while, 99% of your orders will be complete, so
SELECT COUNT(*)
FROM orders
WHERE status = :1should do a full table scan if you specify 'COMPLETE'. If you passed in 'IN TRANSIT', though, an index scan might be more appropriate. If you want to pass in different values and get different query plans, you need to use literals. 99% of the time, though, you want the same plan, so you want to use bind variables.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Csv no data found when using bind variables

Hi,
I have created a report, that uses 2 date variables to limit the query and rows display as they should. But clicking the csv link opens csv having one row stating 'No data found...'. If I set static values in place of variables, I get the right result. How could I use bind variables and get the right answer in csv (without coding my own function)?
Kaja

I am having the same problem.
The export link opens a new session without submitting the current page. The page item values are therefor not saved to cache before the export is undertaken.
Any report using page item bind variables in the where clause will not export correctly as the bind values are either null or those of the previous page submit.
Any ideas on how to get round this??

Query don't use the right index when using bind variables

Hi people !
I need some help because I have an issue with a query that don t use the right Indexes as it should
First of all, I have mainly three tables :
ORDER : Table that contains description for each Order (approximately 1 000 000 Records)
ORDER_MVTS : Table that contains the tasks made (called movements) to set up each Orders
with quantity of packages prepared for each product (approximately 10 000 000 Records)
PRODUCT : Tables that contains the products (approximately 50 000 Records)
When I launch the query with hard coded values, it brings back response very fast
because it uses the right index (ORDER_DHR_VALID) which represent the date and hour of the order
(with format 'DD/MM/YYYY HH24:MI:SS'). The selectivity for this index is good.
NB 1: I have to use the trick " >= Trunc(date) and < trunc(date) +1 " to filter on a simple date because
the index contains hour and minutes (I know it wasn't probably a bright idea at conception time).
NB 2: The index on ORDER_MVTS.PRODUCT_CODE is'nt discriminating enough because there is'nt enough different products.
It's the same for index on CUSTOMER_CODE and on MVT_TYPE so only the index on ORDER.DHR_VALID is good.
Here is the correct explain plan when I execute the query with hard coded values :
SELECT SUM(ORDER_MVTS.NB_PACKAGE)
FROM ORDER_MVTS, PRODUCT, ORDER
WHERE ORDER.DHR_VALID >= TRUNC(to_date('14/11/2008 10:04:56','DD/MM/YYYY HH24:MI:SS'))
AND ORDER.DHR_VALID < TRUNC(to_date('14/11/2008 10:04:56','DD/MM/YYYY HH24:MI:SS')) + 1
AND ORDER_MVTS.MVT_TYPE = 'DELIVERY'
AND PRODUCT.CODE = ORDER_MVTS.PRODUCT_CODE
AND ORDER_MVTS.ORDER_CODE = ORDER.CODE
AND ORDER.CUSTOMER_CODE = 'ADIDAS'
AND PRODUCT.CODE = 1234
Rows Row Source Operation
1 SORT AGGREGATE
2 NESTED LOOPS
4 NESTED LOOPS
2 INDEX UNIQUE SCAN (object id 378548) --> PRODUCT_PK
4 TABLE ACCESS BY INDEX ROWID ORDER
777 INDEX RANGE SCAN (object id 378119) --> ORDER_DHR_VALID
2 TABLE ACCESS BY INDEX ROWID ORDER_MVTS
30 INDEX RANGE SCAN (object id 377784) --> ORDER_MVTS_ORDER_FK
Now the problem is when the query is used in a Cursor with bind variables.
It seems like Oracle don't use index on ORDER.DHR_VALID because he can't figure out that he have
to actually filter on a short period of time (only one day).
So Oracle uses the index on ORDER_MVTS.PRODUCT_CODE which is'nt a bright idea (it takes 10 secondes instead of just one)
Here is the bad explain plan :
Rows Row Source Operation
1 SORT AGGREGATE
2 NESTED LOOPS
722 NESTED LOOPS
2 INDEX UNIQUE SCAN (object id 378548) --> PRODUCT_PK
722 TABLE ACCESS BY INDEX ROWID ORDER_MVTS
1790 INDEX RANGE SCAN (object id 377777) --> ORDER_MVTS_PRODUCT_FK
2 TABLE ACCESS BY INDEX ROWID ORDER
1442 INDEX UNIQUE SCAN (object id 378439) --> ORDER_PK
Now I have found two solutions to this problem :
1) using a Hint to force the use of index on ORDER.DHR_VALID (with /*+ INDEX(ORDER ORDER_DHR_VALID) */ )
2) Using Dynamic SQL and keeping the date hard coded (but not the other values except mvt_type)
For example :
QUERY :=
'SELECT SUM(ORDER_MVTS.NB_PACKAGE)
FROM ORDER_MVTS, PRODUCT, ORDER
WHERE ORDER.DHR_VALID >= TRUNC(TO_DATE('''||To_char(P_DTE_VAL,'DD/MM/YYYY')||''',''DD/MM/YYYY'')) '||
AND ORDER.DHR_VALID < TRUNC(TO_DATE('''||To_char(P_DTE_VAL,'DD/MM/YYYY')||''',''DD/MM/YYYY'')) + 1 '||
AND ORDER_MVTS.MVT_TYPE = 'DELIVERY'
AND PRODUCT.CODE = ORDER_MVTS.PRODUCT_CODE
AND ORDER_MVTS.ORDER_CODE = ORDER.CODE
AND ORDER.CUSTOMER_CODE = :CUSTOMER
AND PRODUCT.CODE = :CODE ';
These two solutions work but Number 1 is bad in theory because it uses a Hint
and Number 2 may be difficult to code.
So my question is : Does someone knows another solution to force the use of index ORDER_DHR_VALID that can be simple and reliable.
Thank you very much for support
Edited by: remaï on Apr 1, 2009 4:08 PM

What version of oracle you have? CBO work is different in 9i and 10g.
Usually cost based optimizer do not want to use index for >< condition with binding variables because optimizer can not use statistic to determine selectivity, and by default selectivity of <> operators is low.
(As I remember '>' selectivity by default is 5%, you have two conditions > and <, therefore resulting selectivity will be 0.05*0.05=0.0025 as two independent events, but selectivity of other conditions
ORDER_MVTS.MVT_TYPE = 'DELIVERY' or ORDER.CUSTOMER_CODE = 'ADIDAS' looks much better for CBO)
The best solution I see is do not use binding variables. Actually your query looks as searching query, which executes not so often, therefore you will not have perfomance win along of skipping execution plan creation.
Edited by: JustasVred on Apr 1, 2009 10:10 AM

Regarding usage of constants while using bind variables

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