Oracle CHAR Bind Variable Padding

I have a oracle table with a CHAR(30) primary key. If I call
getObjectById() with a key of less than 30 chars a
JDOObjectNotFoundException is thrown as oracle expects the key to be
padded.
What are my options?

Hello,
No, you cannot. If the image item points to a database BLOB column, Forms will store the image in this column at commit time.
Francois

Similar Messages

Bind variables improve the performence of query??

Hi,
Bind variables improve the performence of program or SQL Query.
Select empno,ename,sal from emp where empno=:eno;
select sal into :vno from emp;
According to these queries i am asking performence of bind variables to learn more from you.
Regards,
Venkat.
Edited by: Venkata2 on Sep 16, 2008 6:40 PM

Karthick_Arp wrote:
any variable inside a stored procedure is a bind variable.
using bind variables can help you avoid hard parse. which leads to performance improvement.
Well, you mentioned pros and I will mention cons. Since bind variable value is not known until execution time optimizer can not select best plan. So Oracle introduced bind variable peeking where plan is deferred until first execution. With bind variable peeking optimizer costructs plan using bind variable values at the first execution. However, if first execution has "not typical" bind variable values we end up with sub-optimal plan.
SY.
P.S. Please do not consider my reply as "we should not use bind variables".

Inconsistent datatypes: expected - got CHAR, Detail view bind variables

Hi.
Here is my problem:
I have master detail views connected with a view link. Both of views have bind variables that hold some session info:
It's a menu on database and I am trying to hide some values based on user permissions.
When running application module, everything works fine. The problem occurs when I try to show menu as a tree table, or any other table, on a page.
The root view executes fine, but then I get an
"java.sql.SQLSyntaxErrorException: ORA-00932: inconsistent datatypes: expected - got CHAR"
error in executeQueryForCollection method of detail view. (this method is overridden)
Bind Variables are:
- :menuRoot -> which holds value of Root node. (In detail view it's just a dummy variable. It is explaned later on why i used it.)
- :listOfUserPermmission -> array of user permissions.
My query looks like this:
1.Master View:
SELECT MetVMenu.CHILD_ID,
       MetVMenu.CHILD_IME_MODULA,
       MetVMenu.PARENT_ID,
       MetVMenu.PARENT_IME_MODULA,
       MetVMenu.ZST,
       MetVMenu.NIVO,
       MetVMenu.CHILD_NAZIV_V_MENIJU,
       MetVMenu.CHILD_TIP_MODULA,
       MetVMenu.CHILD_OPIS_MODULA
FROM MET_V_MENU MetVMenu
WHERE MetVMenu.PARENT_IME_MODULA like :menuRoot
and MetVMenu.CHILD_IME_MODULA in (SELECT * FROM TABLE(CAST(:listOfUserPermission AS STRARRAY)))CHILD_IME_MODULA and PARENT_IME_MODULA are also names of permissions.
2.View Link that connects master.CHILD_ID and detail PARENT_ID
3.Detail view, that then links to itself... to get the tree menu.
SELECT MetVMenu.CHILD_ID,
       MetVMenu.CHILD_IME_MODULA,
       MetVMenu.PARENT_ID,
       MetVMenu.PARENT_IME_MODULA,
       MetVMenu.ZST,
       MetVMenu.NIVO,
       MetVMenu.CHILD_NAZIV_V_MENIJU,
       MetVMenu.CHILD_TIP_MODULA,
       MetVMenu.CHILD_OPIS_MODULA
FROM MET_V_MENU MetVMenu
WHERE :menuRoot like 'a'
and
MetVMenu.CHILD_IME_MODULA in (SELECT * FROM TABLE(CAST(:listOfUserPermission AS STRARRAY)))4. ViewLink that connects CHILD_ID and PARENT_ID of this "detail" view.
Both views executeQuery methods are overridden to set Bind variables before execution.
I get an arrayList of strings (permissions) from session and then convert it to Array.
     ArrayList permmissionsArray = (ArrayList)MyUserSession.getSessionValue("permissions");
     Array permissions = new Array(permissionsArray.toArray());
        HashMap context = new HashMap();
        context.put(DomainContext.ELEMENT_SQL_NAME, "STRARRAY");
        context.put(DomainContext.ELEMENT_TYPE, String.class);
        if(permissions != null){
            permissions.setContext(null, null, context);
            setlistOfUserPermission(permissions);
     //Here I set menuRoot variable.
     I also noticed that there are problems with how I define bind variables (the order matters).
So when i didn't use menuRoot variable in detail view I got the
“inconsistent datatypes: expected - got CHAR"
error in application module.

I went through those links, and I am sure the user has enough rights on STRARRAY object.
I noticed that when running application module things work fine if I firstly execute RootView - Master view.
and then double click on VL which shows detail view in table.
The error occurs if I click on ViewLink first. I am not sure if I am even "allowed" to do that.
I set the parameters with "setNamedWhereClauseParam" and print them out before i call super.executeQueryForCollection() and this the output i get:
ExecuteQueryForCollectionRoot
Permission: [AdfIn2Ogrodje.ROOT, AdfIn2Ogrodje.ADMINISTRACIJA, HOME]
[87] MetVMenuRoot1 ViewRowSetImpl.setNamedWhereClauseParam(listOfUserPermission, oracle.jbo.domain.Array@e1af74d9)
[88] MetVMenuRoot1 ViewRowSetImpl.setNamedWhereClauseParam(menuRoot, AdfIn2Ogrodje.ROOT)
//Print before execution.
EXECUTE_MENUROOT menuRoot: AdfIn2Ogrodje.ROOT
EXECUTE_MENUROOT permission: oracle.jbo.domain.Array@e1af74d9
    Permission: AdfIn2Ogrodje.ROOT
    Permission: AdfIn2Ogrodje.ADMINISTRACIJA
    Permission: HOME
[89] MetVMenuRoot1>#q computed SQLStmtBufLen: 537, actual=447, storing=477
[90] SELECT MetVMenu.CHILD_ID,         MetVMenu.CHILD_IME_MODULA,         MetVMenu.PARENT_ID,         MetVMenu.PARENT_IME_MODULA,         MetVMenu.ZST,         MetVMenu.NIVO,         MetVMenu.CHILD_NAZIV_V_MENIJU,         MetVMenu.CHILD_TIP_MODULA,         MetVMenu.CHILD_OPIS_MODULA FROM MET_V_MENU MetVMenu WHERE MetVMenu.PARENT_IME_MODULA like :menuRoot and MetVMenu.CHILD_IME_MODULA in (SELECT * FROM TABLE(CAST(:listOfUserPermission AS STRARRAY)))
[91] ViewObject: [adfin2.menu.model.views.MetVMenuRoot]MetMenuAppModule.MetVMenuRoot1 Created new QUERY statement
[92] Bind params for ViewObject: [adfin2.menu.model.views.MetVMenuRoot]MetMenuAppModule.MetVMenuRoot1
[93] Binding null of type 12 for "menuRoot"
[94] Binding null of type 12 for "listOfUserPermission"
protected void executeQueryForCollection(Object object, Object[] object2, int i) {
        System.out.println("ExecuteQueryForCollectionRoot");
        setParametersForSessionTest(); // method where i set the parameters.
        printExecute(); // printing
        super.executeQueryForCollection(object, object2, i);
    }After a few clicks on OK button the query executes normally.
What I am guessing is, that executeQueryForCollection just takes whatever is in object2 and that's null at the beginning.
I tried to use this method, which sets the bind variables in object2. And it gives me "Invalid column type" error.
http://packtlib.packtpub.com/library/9781849684767/ch04lvl1sec07

Can Oracle convert literals to bind variables?

Good morning everyone.
I have a procedure similar to this in our database:
    FUNCTION Get_Tag_Element_Id_For_Set(Element_Attr_Id_Table_In   in    ATTRIBUTE_TABLE_ID_TAB) RETURN NUMBER IS
      v_Select_Statement                    VARCHAR2(32767);
      v_Element_Id                             ELEMENT.Element_Id%TYPE;
    BEGIN
      FOR I IN 1..Element_Attr_Id_Table_In.COUNT LOOP
        IF v_Select_Statement IS NULL THEN
          v_Select_Statement := 'SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Element_Attribute_Id = ' || Element_Attr_Id_Tab_In(i);
        ELSE
          v_Select_Statement := v_Select_Statement || ' intersect ' ||
                                'SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Element_Attribute_Id = ' || Element_Attr_Id_Table_In(i);
        END IF;
      END LOOP;
      EXECUTE IMMEDIATE v_Select_Statement INTO v_Element_id;
      RETURN v_Element_Id;
    END;What this does is to create a query similar to this:
SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Tag_Element_Attribute_Id = 1 intersect
SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Tag_Element_Attribute_Id = 2 intersect
SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Tag_Element_Attribute_Id = 3 intersect
SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Tag_Element_Attribute_Id = 4 intersect
SELECT distinct Element_Id FROM ELEMENT_ATTRIBUTE_MANY_2_MANY WHERE Tag_Element_Attribute_Id = 5;
I am using Dynamic SQL because the number of intersect pieces can vary from 1 to 15 and in the future it can grow.
The problem that I have is that because the literals are part of the string, the query is being hard parsed every single time. In our production environment this means 100s of thousands of times per day which according to our DBA has added 15% plus to our average load. I know that I can come up with a rewrite to avoid this, but I was wondering if there is a parameter I can set at the session or at the database level where the database itself can convert this kind of query into one with bind variables.
Thanks,
Tom
Edited by: Thomas Morgan on May 3, 2013 8:21 PM

Thomas Morgan wrote:
Basically I have an XML document.
The document has ELEMENTS.
ELEMENTS can have attributes.
There is a many to many relationship between ELEMENT and ATTRIBUTES so I have a XREF table to represent this relationship.
When I receive a new document, I need to determine if a group of ATTRIBUTES already exist together in the XREF table so I have to find their common ELEMENT_ID or NULL in which case I would create a new ELEMENT and associate the new set of attributes to the new ELEMENT.
Since the number of attributes can vary from 1 to around 15 for now, I had to dynamically build the query that find the common ID(intersect) if it exists.
Here is some DDL and inserts:
CREATE TABLE ELEMENT(ELEMENT_ID NUMBER NOT NULL);
CREATE TABLE ELEMENT_ELEMENT_ATTRIBUTE_XREF(Element_Id NUMBER NOT NULL, Element_Attribute_Id NUMBER NOT NULL);
ALTER TABLE ELEMENT_ELEMENT_ATTRIBUTE_XREF ADD CONSTRAINT ELEMENT_ATTR_MANY_2_MANY_PK PRIMARY KEY(Element_Id, Element_Attribute_Id);
ALTER TABLE ELEMENT ADD CONSTRAINT ELEMENT_PK PRIMARY KEY(Element_Id);
INSERT INTO ELEMENT VALUES(1);
INSERT INTO ELEMENT VALUES(2);
INSERT INTO ELEMENT VALUES(3);
INSERT INTO ELEMENT VALUES(4);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(1, 1);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(1, 2);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(2, 1);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(3, 1);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(3, 3);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(3, 4);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(3, 5);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(4, 6);
INSERT INTO ELEMENT_ELEMENT_ATTRIBUTE_XREF VALUES(4, 7);
So for instance if I passed an array (Attribute ID Tab) containing ELEMENT_ATTRIBUTE_ID list 6 and 7 I would get 4 as the answer.
Hope this helps,
Thanks,
TomAwesome, thanks!
I'm not sure this works 100% for what you need, but I thought I'd give it a shot. I've used a built in array (sys.odcinumberlist) that you should have access to on your installation (assuming you have a relatively recent version of Oracle).
I left out the part where you would loop through the array you are currently passing in to your procedure to build up this new array that you can use in a SQL statement.
Cheers,
create or replace procedure maybe_this
   in_list           sys.odcinumberlist
is
   l_commonality     number;
begin
   begin
      select
         distinct
            xref.element_id
      into
         l_commonality
      from
            table(cast(in_list as sys.odcinumberlist)) list
        , element_element_attribute_xref   xref
      where
         xref.element_attribute_id = list.column_value;
      dbms_output.put_line('match on element_id = ' || l_commonality);
   exception
      when too_many_rows or no_data_found
      then
         dbms_output.put_line('no match');
   end;
end;
ME_TUBBZ?exec maybe_this(sys.odcinumberlist(1,2));
no match
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
ME_TUBBZ?exec maybe_this(sys.odcinumberlist(6,7));
match on element_id = 4
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01

How to pass a value to a bind variable in a query report in oracle apex

Hi Guys,
I have requirement to send weekly reports via email to some users. The users should receive their own records in the report. The user details is stored in a table. What I am planning to do is to create a report query in oracle apex to generate the report and then run a function/procedure via a scheduler to email the report to respective users. Now my query is ............. is it possible to pass a value (user name) to the report query to pull records of only that user? I know we can have bind variables in the report query but I have no idea how to pass a value for bind variables from a function/procedure.
Can anyone help me on this issue or suggest a better approach?
Thanks,
San

You need to use dynamic sql
But please keep in mind that since you're using Oracle you may be better off posting this in some Oracle forums
This forum is specifically for SQL Server
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Oracle bind variable

Can i use an item which type is image as bind variable in the insert statement?
When i pass image item of oracle form as a bind variable in the insert statement then "Bad bind variable error" occurs.
Please help me.
- ashraf

Hello,
No, you cannot. If the image item points to a database BLOB column, Forms will store the image in this column at commit time.
Francois

Oracle BI Publisher - Passing multiple wildcard search to a bind variable

Hi,
Please help me in resolving the below mentioned issue:
I have developed a report in oracle BI Publisher with a SQL query.
While scheduling the report to run I used to pass mutilple parameters like CGAMSVC08,RLCSVC51
If the pass the parameter with wildcard search like C% it works.
When I pass two or more parameter values with wildcard search like C%,R% its not working.
Could you please let me know how should I give the bind variable in the SQL query. Currently I'm paramater like the one shown below for passing multiple paramaters:
Where (',' || :PRMRETRID || ',' like '%,'||RL.RETROFIT_ID|| ',%')
Edited by: user1101445 on May 23, 2012 2:02 AM

HI Tyler.
Well, here's the latest.
I found this little gem in the BIEE 10.1.3.3.3 Release Notes Documentation...
This issue applies to Versions 10.1.3.3, 10.1.3.3.1, 10.1.3.3.2, and 10.1.3.3.3.
Reports that use the BI Publisher data template as the data model may fail with the
following error: "Data not defined."
This error will occur if you defined a parameter in your data template but you do not
pass a value to it via the user interface. If you do not specify this parameter in the "Parameters" section of the report definition that you created using the BI Publisher Edit Report interface, then you will receive the error.
To work around this issue, either define the parameter in the Edit Report interface or remove the parameter from the data template.
That bit is now working.
Having set this up and using your guide it works if my SOAP parameters declaration passes a single value like this...
<parameterNameValues>
<item>
<name>P_INVOICE_ID</name>
<multiValuesAllowed>true</multiValuesAllowed>
<values>
<item>16641</item>
</values>
</item>
</parameterNameValues>
But if I try and pass two or more like this...
<parameterNameValues>
<item>
<name>P_INVOICE_ID</name>
<multiValuesAllowed>true</multiValuesAllowed>
<values>
<item>16641,18421</item>
</values>
</item>
</parameterNameValues>
BIP states "java.sql.SQLException: ORA-01722: invalid number"
My SQL where clause is..
<sqlStatement name="Q1">
<![CDATA[select * from vw_invoice_summary
where invoice_summary_id IN (:P_INVOICE_ID)]]>
</sqlStatement>
And the BIP error records the parameter value as P_INVOICE_ID 16641,18421 (which are legit invoice IDs)
In summary, works if I pass one invoice ID, fails if I pass two or more.
Any ideas? Or do you reckon this is now a post for the BIP forum?
Kind regards.
Simon

Using bind variables in Oracle SQL developer

Hi all,
i am using Oracle SQL developer. i want to use the bind variable in my sql.
variable myid number :=1;
select * from mds_3618_request where id = :myid;
but i am getting the below error.
Error starting at line 2 in command:
select * from mds_3618_request where id = :myid
Error report:
SQL Error: Missing IN or OUT parameter at index:: 1
Does Oracle SQL developer support bind variables in the SQL statements?
thanks in Advance
Vali Shaik

You are probable going to get a quicker answer on this forum : SQL Developer
-- Andy

How to use function v( ) for bind variable 30 char

I have the following process, try to load columns from table to the page. One of the column complains about > 30 char cannot use bind variable. I change to
V('c1.OBJ_OUT_SOURCIING_WAD_TYPE') but still not work.
Please help;
BEGIN
FOR c1 in ( SELECT *
FROM #OWNER#.OBJECT_OUT_SOURCING
WHERE OBJ_NAME = :P503_OBJ_NAME AND
OBJ_OWNER = :P503_OBJ_OWNER AND
DATABASE_NAME = :P503_DATABASE_NAME)
LOOP
:P503_OBJ_NAME := c1.OBJ_NAME;
:P503_OBJ_OWNER := c1.OBJ_OWNER;
:P503_DATABASE_NAME := c1.DATABASE_NAME;
:P503_APPL_NAME := c1.APPL_NAME;
:P503_OBJ_TYPE := c1.OBJ_TYPE;
:P503_OBJ_OUT_SOURCIING_WAD_TYPE := V('c1.OBJ_OUT_SOURCIING_WAD_TYPE');
END LOOP;
END;

Che-Hwa,
Change this statement: :P503_OBJ_OUT_SOURCIING_WAD_TYPE := V('c1.OBJ_OUT_SOURCIING_WAD_TYPE'); to: htmldb_application.update_cache_with_write(p_name=>'P503_OBJ_OUT_SOURCIING_WAD_TYPE',p_value=>c1.P503_OBJ_OUT_SOURCIING_WAD_TYPE);Scott

Same Oracle Bind Variable Name in 2 VOs not permitted?

Hi,
JDeveloper Studio Edition Version 10.1.3.3.0.4157
I have 2 different Entity based VOs, those VO's use similar Entities but their WHERE is clause is different, one VO doesn't extend the other one.
I have used Oracle (first time use for me) named bind type variables with identical names in both where clause.
When I try to define a bind variable ex. TariffIdParam in the second VO the wizard shows me an error:
Variable name is a reserved word or a variable or attribute of the given name already exists ...
Does that mean that an Oracle Bind Variable Name must me unique in the whole application?
Partial where clause:
VO1
DeliveryDetailGroup.DELIVERY_TARIFF_ID = :TariffIdParam
VO2
DeliveryDetailGroup.DELIVERY_TARIFF_ID = :TariffIdParam
Thanks
Fred

I created the second VO by using "File save as".
To resolve the problem in the new xml file I replaced the references to the other VO.
Regards
Fred

Oracle ODBC Driver adds bind variable when browsing whole table in Access

Hi, we are looking for some reasons why we may see this behavior in the Oracle ODBC driver (10gR2 and 11g) when using Microsoft Access (2003 or 2007)...
1) Link a table from the Oracle database.
2) Double-click the newly linked table to "browse" it.
Oracle sends the following statement to the server:
{color:#0000ff}select * from linked_table where primary_key = :b1{color}
It then proceeds to read the entire table.
If I tell Microsoft Access that there is no primary key, the query gets sent as:
{color:#0000ff}select * from linked_table{color}
And the query comes back as soon as the first 100 or so rows are fetched which is quite quickly.
ADDITIONAL NOTES:
1) If the table has a primary key or unique constraint, Microsoft Access automatically assigns that as the primary key.
2) We can stop the behavior in #1 if we wrap a view around it which prevents Access from discovering that information and then it prompts for a primary key definition.
3) If we use the Microsoft ODBC driver, the bind variable is not added no matter what the primary key defintiion is.
We're stumped and are looking for solutions and/or workarounds without having to wrap all of our tables in views to hide the fact that there is a primary key.
Thanks,
Steve

Thanks for the response, Greg.
The specific question I am seeking an answer for (sorry it was not clear on my first message) is this:
Why does the Oracle driver add the bind variable to the query only when the primary key is defined?
The Microsoft ODBC driver does not add the bind variable with or without a primary key defined.
You asked how I traced this statement and what I am doing is launching the query in Access and then using TOAD to view the V$SESSION and V$SQL_TEXT_WITH_NEWLINES views. All I do is change the driver. This is just for a simple browse table (double-click on the table) which should send
select * from table
However, whenever I use the Oracle ODBC driver (with a primary key defined) it sends
select * from table where primary_key = :1
If I remove the primary key on the table definition, the Oracle driver sends
select * from table
What is it about the primary key that could cause that behavior?
I don't think it is the MDAC/Jet level because this is the conversion to the native SQL statement not the Jet version. I know the Oracle driver has to do that part because you have those workaround options like don't add the RULE hint, etc. That's not part of the Jet engine.
Hope that helps. I'm just baffled over this one and wish I knew where to go next.

Bind Variable in Oracle Standard Report

hi experts
i'm using oracle 10g r2 , working on oracle erp r12 ebs
i have a standard report where i add some bind variables but the code is too complex and most of the data retrieved from formula column define in oracle standard report . how to add bind variable in this scenrio??

I think you want to post in the appropriate EBS sub forum. This one is specifically to do with SQL and PL/SQL, so not everyone here will have knowledge of EBS.

Bind variable with search parameter in Oracle BI Publisher 10

Search list for a search parameter in Oracle BI EE works fine when the query doesn't contain a bind variable (parameter identifier). But when a bind variable is introduced in the constraint of search list query, it keeps on searching endlessly. For example,
-- this doesn't work
select col1
from table
where table.col2 = :I_param_bind_var
-- this works
select col1
from table
where table.col2 = 'xyz'
Using such bind variable in the list of values for menu parameters works fine. Is it an issue regarding publisher or am I missing something?
Edited by: 933296 on Aug 21, 2012 1:38 AM

<?param@begin:Show_Location;'Yes';'string';'Yes,No'?>
it will give the Parameter Show_Loactaion with drop down Yes and No.
and to display <?$Show_Location?>
<?param@begin:dept;'PAY'?>
<?$dept?>

Use of bind variables with the oracle db - to improve library cache perform

Dear Friends,
We are using oracle 9.0.1.1.1 db server - the performance of the db was pathetic and upon investigation it was revealed that the library cache was over loaded with sql hard parses generated by not using bind variables. We are using vb as a front end with oracle and our connection object in vb is created using ole db for oracle provided by oracle (installed from oracle client custom - programmer option).
I would appreciate if any body can tell how can we use bind variables in vb to connect to oracle such that the hard parses can be changed into soft parses.
Your effort to bring some peace in my life is worth comendable and I would be very obliged for your time and help.
Thanks a lot.
Bye
Take care.
qj

Generally, you would use bind variables by changing statements that are written like this
select * from emp where empno=6678 and ename='Jones'
so that they're written like
select * from emp where empno=? and ename=?
How you then bind these question marks to the particular values you want depends on the API you're using (ADO? OLE DB directly?, etc). If you have a support contract, there are plenty of examples for any API on metalink.oracle.com
Justin

Possible for Oracle to consider constraints when using bind variable?

Consider the following table with a check constraint listing the possible values of the column
create table TEST_TABLE(
my_column varchar2(10));
insert into TEST_TABLE select 'VALUE1' from dba_objects;
alter table TEST_TABLE
add constraint TEST_TABLE_CHK1
check (my_column in ('VALUE1', 'VALUE2'));
begin dbms_stats.gather_table_stats(ownname=>user,tabname=>'TEST_TABLE');END;Let's see the number of logical I/O's needed for the following SQL statements.
(The value was obtained by the delta ofselect m.value from v$mystat m, v$statname n
where name='session logical reads' and m.statistic#=n.statistic#)
If string lateral is used:
declare
   n number;
begin
select count(*) into n from test_table where my_column='VALUE1';
end;
Consistent Gets: 21
declare
   n number;
begin
select count(*) into n from test_table where my_column='VALUE2';
end;
Consistent Gets: 21
declare
   n number;
begin
select count(*) into n from test_table where my_column='VALUE3';
end;
Consistent Gets: 0Oracle can eliminate the table if it knows the queried value can't satisfy the constraint. Good.
(Actually, the execution plan for the last query included the 'FILTER' operation.)
However, if bind variable is used:
declare
   n number;
   x varchar2(10);
begin
x := 'VALUE1';
select count(*) into n from test_table where my_column=x;
end;
Consistent Gets: 21
declare
   n number;
   x varchar2(10);
begin
x := 'VALUE3';
select count(*) into n from test_table where my_column=x;
end;
Consistent Gets: 21Oracle can't eliminate the table using the constraint. I can understand that because bind variables are used, Oracle can't directly eliminate the table when generating the execution plan. However, is it possible to eliminate the table, or at least employ some shortcut in runtime? If not, will this be a performance loss compared with using values laterals when check constraint exists?
(And is it possible to use autotrace on PL/SQL block in sqlplus?)
Oracle:
     10.2.0.4 SE
     11.2.0.2 SE
OS:
     RHEL5

However, is it possible to eliminate the table, or at least employ some shortcut in runtime? I can't see how to do this. Oracle has a sqltext that has an embedded bind variable in it. And for this sqltext it has an execution plan in the shared pool that will be used irrespective of the actual bound values at runtime.
Maybe in 11G, with adaptive cursor sharing / plan bind awareness, Oracle might be smart enough to introduce a second execution plan for the VALUE3 case.
If not, will this be a performance loss compared with using values laterals when check constraint exists?Only if you submit the dumb query and search for records with VALUE3... Normally your application code would not hold/generate these queries.
Will it?
For columns whose values are bound by a CHECK constraint, one might even consider to never use bind variables, since very likely you will have few versions of queries that use these columns.
Not?
Edited by: Toon Koppelaars on Jun 22, 2011 1:20 PM

Oracle CHAR Bind Variable Padding

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