Oracle 10g Diff in execution plan query with binding var Vs without

We recently did 10g upgrade. In 10g, execution plan differs for query with binding var(thru jdbc etc) Vs without it as given below. For query with binding var,
it chooses poor execution plan(no index is used, full scan is done etc). everything worked fine in 9i. To rectify the problem, we have to hint query with right index,join etc. but i dont like this solution.
I would rather prefer to correct database to choose right execution path instead of eacy query level. but not sure what causes the issue.
Does anybody came across this issue? if so, Please share your experiences. Thanks for the help. Do let me know if you need more info.
1. Query without binding bar:
select * from test where col1 = :1 and col2 = :2
1. Query without binding bar:
select * from test where col1 = 'foo' and col2= 'bar'

I am not an expert but in my humble opinion it is the developer's responsability to ensure the correct explain plan is used before deploying code to production, if the explain plan returned by the DB is bad, then the use of a hint is perfectly acceptable.
Check this out: http://lcgapp.cern.ch/project/CondDB/snapshot/performance.html
Excerpt:
Bind variable peeking. If an SQL query contains bind variables, the optimal execution plan may depend on the values of those variables. When the Oracle query optimizer chooses the execution plan for such a query, it may indeed look at the values of all bind variables involved: this is known as "bind variable peeking".
In summary, the execution plan used for a given SQL query cannot be predicted a priori because it depends on the presence and quality of statistics and on the values of bind variables used at the time the query was first executed (hard-parsed). As a consequence of this instability of execution plans, very different performances may be observed for the same SQL query. In COOL, this issue is addressed by adding Oracle hints to the queries, to make sure that the same (good) plan is used in all cases, even with unreliable statistics or unfavourable bind variables.
Edited by: Rodolfo Ferrari on Jun 3, 2009 9:40 PM

Similar Messages

Query with bind var created under apex to generate xml data

Hi all;
BiP: 10.1.3.4
Apex: 4
DB 10G
Goal: want to generate a report by running a query with bind variables under apex.
problem: when attempted to create a query under shared components in apex, at the downloading xml data stage, I always get "no data found" eror. Thus I can't save xml data for further report work. This only occurs when bind var involved. I have tticked "incl. session variables" and added the item but to no avail.
Does anyone know how to do this and get the xml data to recive the bind variable ?
Thanks.
lulu

To get the xml data, sql query has to return something. Why the sql is not returning anything can be better investigated outside the BI Publisher with special tool like SQL Developer or TOAD. There you have to run your query and make it working. One of the steps would be to try the sql without the parameter, see what data it brings back and go from there. One of possibilities why the parameter kills the output may be the NULL values involved, but you need to try the sql outside the BIP first.

Report query with bind variable

Trying to create a report query for xsl-fo print. For output format I pick "derive from item" then pick the item name from the list, on the next screen, I paste the query with the bind variable. on the next step test query, I always get "data not found" regardless what value I type in. This is the same query that I ran under sql commands without any issues.
Does anyone run into the same issue as I have when attempted to create a query with bind var ? There is no problem creating a query without bind varibles. . thanks.
Munshar

Hi, please did you get any solution to this issue? I am having similar challenge right now.
select     EMP.DEPTNO as DEPTNO,
     DEPT.DNAME as DNAME,
     EMP.EMPNO as EMPNO,
     EMP.ENAME as ENAME,
     EMP.JOB as JOB,
     EMP.MGR as MGR,
     EMP.HIREDATE as HIREDATE,
     EMP.SAL as SAL
from     SCOTT.DEPT DEPT,
     SCOTT.EMP EMP
where EMP.DEPTNO=DEPT.DEPTNO
and      DEPT.DNAME =upper(:dname)
This run perfectly in sql developer, toad, and even inside publisher if I login directly to publisher to create report.
Generating this same query in shared component query builder and testing it returns no data found. If I remove the last line, it works. but with the last line, it return no data found. It seems no one has been able to provide solution to this issue

SQL query with Bind variable with slower execution plan

I have a 'normal' sql select-insert statement (not using bind variable) and it yields the following execution plan:-
Execution Plan
0 INSERT STATEMENT Optimizer=CHOOSE (Cost=7 Card=1 Bytes=148)
1 0 HASH JOIN (Cost=7 Card=1 Bytes=148)
2 1 TABLE ACCESS (BY INDEX ROWID) OF 'TABLEA' (Cost=4 Card=1 Bytes=100)
3 2 INDEX (RANGE SCAN) OF 'TABLEA_IDX_2' (NON-UNIQUE) (Cost=3 Card=1)
4 1 INDEX (FAST FULL SCAN) OF 'TABLEB_IDX_003' (NON-UNIQUE)
(Cost=2 Card=135 Bytes=6480)
Statistics
0 recursive calls
18 db block gets
15558 consistent gets
47 physical reads
9896 redo size
423 bytes sent via SQL*Net to client
1095 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
55 rows processed
I have the same query but instead running using bind variable (I test it with both oracle form and SQL*plus), it takes considerably longer with a different execution plan:-
Execution Plan
0 INSERT STATEMENT Optimizer=CHOOSE (Cost=407 Card=1 Bytes=148)
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'TABLEA' (Cost=3 Card=1 Bytes=100)
2 1 NESTED LOOPS (Cost=407 Card=1 Bytes=148)
3 2 INDEX (FAST FULL SCAN) OF TABLEB_IDX_003' (NON-UNIQUE) (Cost=2 Card=135 Bytes=6480)
4 2 INDEX (RANGE SCAN) OF 'TABLEA_IDX_2' (NON-UNIQUE) (Cost=2 Card=1)
Statistics
0 recursive calls
12 db block gets
3003199 consistent gets
54 physical reads
9448 redo size
423 bytes sent via SQL*Net to client
1258 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
55 rows processed
TABLEA has around 3million record while TABLEB has 300 records. Is there anyway I can improve the speed of the sql query with bind variable? I have DBA Access to the database
Regards
Ivan

Many thanks for your reply.
I have run the statistic already for the both tableA and tableB as well all the indexes associated with both table (using dbms_stats, I am on 9i db ) but not the indexed columns.
for table I use:-
begin
dbms_stats.gather_table_stats(ownname=> 'IVAN', tabname=> 'TABLEA', partname=> NULL);
end;
for index I use:-
begin
dbms_stats.gather_index_stats(ownname=> 'IVAN', indname=> 'TABLEB_IDX_003', partname=> NULL);
end;
Is it possible to show me a sample of how to collect statisc for INDEX columns stats?
regards
Ivan

I'm debutante in oracle 10g how to create a database with picture?

I'm debutante in oracle 10g how to create a database with picture? help please

d7401ec1-d4d6-4e54-9eb4-2181ac367d0c wrote:
I'm debutante in oracle 10g how to create a database with picture? help please
Oracle 10g is obsolete. Oracle 11g is already at terminal release.
Have you installed the Oracle rdbms software?
Installing Oracle and Building the Database
If you are going to be a professional DBA, you need to learn to
1) read the documentation
2) wean yourself from dependence on pictures and GUIs.
3) read the documentation
=================================================
Learning how to look things up in the documentation is time well spent investing in your career. To that end, you should drop everything else you are doing and do the following:
Go to docs.oracle.com.
Locate the link for your Oracle product and version, and click on it.
You are now at the entire documentation set for your selected Oracle product and version.
BOOKMARK THAT LOCATION
Spend a few minutes just getting familiar with what is available here. Take special note of the "books" and "search" tabs. Under the "books" tab (for 10.x) or the "Master Book List" link (for 11.x) you will find the complete documentation library.
Spend a few minutes just getting familiar with what kind of documentation is available there by simply browsing the titles under the "Books" tab.
Open the Reference Manual and spend a few minutes looking through the table of contents to get familiar with what kind of information is available there.
Do the same with the SQL Reference Manual.
Do the same with the Utilities manual.
You don't have to read the above in depth. They are reference manuals. Just get familiar with what is there to be referenced. Ninety percent of the questions asked on this forum can be answered in less than 5 minutes by simply searching one of the above manuals.
Then set yourself a plan to dig deeper.
- *Read a chapter a day from the Concepts Manual*.
- Take a look in your alert log. One of the first things listed at startup is the initialization parms with non-default values. Read up on each one of them (listed in your alert log) in the Reference Manual.
- Take a look at your listener.ora, tnsnames.ora, and sqlnet.ora files. Go to the Network Administrators manual and read up on everything you see in those files.
- *When you have finished reading the Concepts Manual, do it again*.
Give a man a fish and he eats for a day. Teach a man to fish and he eats for a lifetime.
=================================

Query with bind variable, how can use it in managed bean ?

Hi
I create query with bind variable (BindControlTextValue), this query return description of value that i set in BindControlTextValue variable, how can i use this query in managed bean? I need to set this value in String parameter in managed bean.
Thanks

Put the query in a VO and execute it the usual way.
If you need to, you can write a parameterized method in VOImpl that executes the VO query with the parameter and then call that method from the UI (as a methodAction binding) either through the managed bean or via a direct button click on the page.

How are execution plan created with tables of stale stats

Hello
I would like to ask the group
1. How oracle handels the execution plan with table joins where some tables have stale stats
2. How would oracle handel execution plan where the table has histogram but the stats are stale.
Database version 11.1.0.7.0
Thanks
Arun

ALTER SESSION SET EVENTS='10053 trace name context forever, level 1';
by doing above before executing the SQL, you can see what & how CBO arrives at the actual execution plan

Oracle 10g - Date format in SELECT query for CFOUTPUT

Hello, everyone.
The project that I am working on in the dev environment is connected to an Oracle 11g database, but the production side is Oracle 10g.
I have a page that is erroring in production (but not development) when it gets to a date that it needs to display.
A co-worker mentioned that, in 10g, if a date/time is being SELECTed, you have to put it in to_char(), so I did that.
But it's still erroring, and I'm not getting an error message, so I'm assuming that I have an incorrect format for the date in the SELECT.
What is the proper format for SELECTing a date/time when using to_char()? Right now, I have SELECT to_char(create_date,'MM-DD-YYYY HH:MI') FROM tableA . Is this not correct for CF to output?
Thank you,
^_^

Please see my original post ("I have a page erroring in production (but not in development) when it gets to a date that it needs to display.") Sorry if it came across as vague. It made sense, to me, when I typed it. But, then, I'm usually typing fast just to get the question out there, when I'm in a hurry.
Haven't done a CFDUMP, yet, as every time I make a change in development that needs to be tested in production, I have to notify my supervisor that there are files that need to be copied into production, which can sometimes take a while, so I try to do troubleshooting on dev side - it's a pain in the you-know-what, but that's the kind of environment I'm working in.
As it turns out, changing the format in the SELECT to_char() did the trick. If anyone else has this issue with Oracle 10g, I'm now using SELECT to_char(create_date,'YYYY/MM/DD HH:MI') FROM tableA, and now the CFOUTPUT is processing the whole page. I guess the MM-DD-YYYY threw CF into a tizzy, breaking the process?
Anyhoo, it's working, now. Thank you, Dan and Adam, for your thoughts on this.
^_^

Oracle 10G upgrade and MRP planning problems

We just upgraded to Oracle 10G and are having users complaining about MRP not planning in correct low level code sequence. What has happened is that the MRP is planning component parts before the parent parts. We have never had this occur before and are on 4.6C hot pack 38. Help!!

Hi,
There are some Post-Upgrade Tasks like set compatible, db stats, check invalid objects, removing some database parameters, etc. Make sure you perform these if you have not, please refer to your specific Oracle upgrade guide.
Thanks,
George

Oracle 10g BI portlet to be integrated with IBM Webspehere portal

We have Oracle 10g BI as a solution for DWH,
We intend to make the access available through one of the Standard JSR 168 portal. Is it possible to publish these reports on IBM Websphere Portal.
If yes are there some resources available for the same
Sudeep Dey
Manager IT

We have Oracle 10g BI as a solution for DWH,
We intend to make the access available through one of the Standard JSR 168 portal. Is it possible to publish these reports on IBM Websphere Portal.
If yes are there some resources available for the same
Sudeep Dey
Manager IT

Can i work with oracle 10g express edition by connecting it with visuval studio 2010?

i have oracle 10g-express edition,and visuval studio 2010, can i have a connectivity between these two?or it requires any additional installations,or any special procedures for installing it? HELP ME..

You might want to post this in the Oracle 10g XE support forum, where you might get a better response. The is is the support form for Oracle App Express..
Thank you,
Tony Miller
Monroe, WA

How to fix different execution plan for different bind variable values?

Please find the below query. The execution plan is fine. The problem That I am facing is in some cases for different bind variable values execution plan gets changed and degrades performance. I have used 6 tables here and all of the tables have histogram on all columns. Database version is Oracle 10g and the value of method_opt is 'For all columns size auto'
SELECT l.LineNumber INTO :b0
FROM Lines l ,LineVersions lv ,Statuses s
WHERE (((((((((((l.serviceContractId=:b1 AND l.LineId<>:b2)
AND lv.LineId=l.LineId) AND lv.StatusId=s.StatusId)
AND s.Code IN ('EPR','ERE','EEP','ERP','PRP','PRD','AAC'))
AND NOT (s.CODE='AAC' AND lv.activeto<TO_DATE(:b3,:b4)))
AND lv.EquipmentDetailId=:b5) AND lv.RouteDetailId=:b6)
AND (lv.cargoDetailId=:b7 OR lv.cargoDetailId IN
(SELECT i_cd1.cargoDetailId
FROM CargoDetails i_cd1 ,CargoDetails i_cd2 ,CargoCommodities i_cc1 ,
CargoCommodities i_cc2 WHERE
((((((i_cd2.cargoDetailId=:b7 AND i_cd1.cargoDetailId<>:b7)
AND i_cd1.ServiceContractId=:b1) AND i_cd1.cargoTypeId=i_cd2.cargoTypeId)
AND i_cc1.cargoDetailId=i_cd1.cargoDetailId)
AND i_cc2.cargoDetailId=i_cd2.cargoDetailId)
AND i_cc1.commodityId=i_cc2.commodityId))))
AND ((lv.customerGroupId IS NULL AND :b11=0) OR lv.customerGroupId IN
(SELECT cgm1.customerGroupId
FROM CustomerGroupMembers cgm1 ,CustomerGroupMembers cgm2 ,CustomerGroups cg1
WHERE (((cgm2.customerGroupId=:b11 AND cgm1.customerNoId=cgm2.customerNoId)
AND cg1.CustomerGroupId=cgm1.CustomerGroupId)
AND cg1.ServiceContractId=l.ServiceContractId)))) AND lv.linetype='C')
AND ROWNUM=1)
After searching in several blogs I have found the below solutions. Please see it and let me know it is correct or not
Solution 1:-Get rid of histogram that does nothing but messes up execution plan by giving below command
exec dbms_stats.gather_table_stats(owner, tablename, method_opt => 'for all columns size 1', cascade => true);
As 6 tables are there I need to execute above command 6 times.
Solution 2:- Use stored outline. Not sure how to get the best execution plan.
I am looking for answers ASAP. Thanks in advance

As you have probably read, bind variables and histograms do not mix well.
Histograms suggest that you have skew in your data such that different values should get different plans
Bind variables exist so that SQL with different supplied values can be shared.
Mix the two together and at parse time with bind variable peeking you get plans for specific values shared for all values.
The solutions you have mentioned are the common approaches, together with a third - use literals not binds if you've got data skew (i.e. your histograms are justified) and don't want shared SQL.
I would have thought that getting rid of some of these histograms may be the right approach if you're none of your application SQL is using literals to benefit from them.
Can you confirm your version of Oracle.
Further reading:
http://jonathanlewis.wordpress.com/2009/05/06/philosophy-1/
http://structureddata.org/2008/03/26/choosing-an-optimal-stats-gathering-strategy/
http://richardfoote.wordpress.com/2008/01/04/dbms_stats-method_opt-default-behaviour-changed-in-10g-be-careful/

Report Query with Bind variables working very slowly

Hi everyone,
I'm having a hard time with one of my Reports.
Basically the query looks like this:
Select *
from x,y,z
where x.lang_id = :P1_LANG
and y.name = :P1_LANG;
I have a textfield and a Select List on my Page which have to have a value before the report is shown.
Now to the problem, when I input a value into these Application Items the Report takes ages (3-5 min). But when I replace the Bind variables (:P1_LANG and :P1_LANG) with the actual values it takes mere seconds.
Anyone got an idea why this might be?
I'm at my wits end -.-
Edited by: DocD on Oct 27, 2009 3:01 AM

Hi
This could be for a number of reasons and unfortunately there is no quick answer...
When you run a query for the first time, the execution plan is worked out by the Cost Based Optimiser (I'm assuming you're using 10g or above here). This is referred to as a hard parse. Next time the same SQL text is used then the execution plan may still be in the shared pool - in this case the same execution plan is used rather than being calculated again.
The great thing about using bind variables is that even with different inputs, the SQL text is the same so the execution plan can be shared for different inputs. One downside is that if the first time the query is executed using bind variables, out of the ordinary values are input, bind variable peeking can lead to a sub optimal execution plan being calculated for the query and then shared in other situations (where more 'normal' values are input).
However, it could be down to a host of other things too. So your first check is to make sure that you have executed both queries a number of times. If you are still getting the same performance issues then plan post the full query, table creation scripts and execution plan for both querys.
Cheers
Ben

Af:query with bind variables and Saved Search

I have a VO and view criteria(VC).
VC has a criteria item ObsoleteDate with range specified as bindVariables "dateFrm" and "dateTo" I dragged & dropped the named criteria as af:Query with table. Table toolbar has 2 buttons in which I set & clear the bind variables. Data is fetched as per as expected based on the VC & bind variables.
The problem is,
If I save my search with bind variables set and swap between the saved searches , all works fine. But the moment I clear bind variables & swap between searches.. "dateFrm" is populated and "dateTo" is null and I get an Exception oracle.jbo.AttrValException: JBO-27035: Attribute Obsolete Date: is required.
Why is this happening?? Saved search is supposed to save the VC with all the bind values set while saving and clearing bind variables shouldn't affect the saved search, right?? Or I have understood it wrong?
I am using JDeveloper 11.1.2.3.0
Thanks

Try
like ? || '%'

How to add '%' to a query with bind variables

Hi,
I am using oracle jdeveloper 11g.
I am trying to create a table to display rows using the below query in a jspx page,
select * from ade_txns where series='WORKPLACE_PT.11.1.1.8.0_GENERIC' and transaction like 'rkumara%'
I am using a view with query and binding variables as below,
select * from ade_txns where series= :p_series and transaction like :p_QAEngineer
I will be passing p_QAEngineer using binding variable using 'ExecuteWithParams' using a dropdown(eg: 'rkumara'). But I need to add a '%' to this value as I am using a 'LIKE' clause in my query.
I tried using,
select * from ade_txns where series= :p_series and transaction like :p_QAEngineer+'%'
But this is not working for me.
Can someone please tell me how i can solve this.
Thanks,
Ranjeet

does this help also?
How to add regular expression in viewobject bind variables
~Abhijit

Oracle 10g Diff in execution plan query with binding var Vs without

Similar Messages

Maybe you are looking for