How to capture the execution plan for a query

HI All,
Can anyone please help me in finding out the command to capture the execution plan for a query.
Execution plan for select * from EMP where <Condtions>
it is getting executed successfully but i need to get the proper execution plan for the same.
Thanks

971830 wrote:
i want to know where execution plan gets generated??
in PMON of server process or in shared pool??
i know that optimixer create execution plan..It is stored in Library Cache (present inside Shared Pool ).
select * from v$sql_plan;An absolute beautiful white paper :
Refer this -- www.sagelogix.com/sagelogix/SearchResults/SAGE015052
Also -- http://www.toadworld.com/KNOWLEDGE/KnowledgeXpertforOracle/tabid/648/TopicID/XPVSP/Default.aspx
HTH
Ranit B.

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How to skip existing execution plan for a query

Hi,
I want to skip existng execution plan for a query which I am executing often. I dont want it to use the same execution plan everytime. Please let me know if any method is there skip the existing execution plan.
Thanks in advance.......
Edited by: 900105 on Dec 1, 2011 4:52 AM

Change the query so it is syntactically different, but has the same semantics (meaning). That way CBO will reparse it and you might get a new execution plan.
One simple way to do that is to add a dummy predicate ( 45=45) to the where clause. The predicate must be changed every time the query is executed ( 46=46 , 47=47 ,… ).
Iordan Iotzov
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Hi all
using oracle 9i release 2
I have issued the following statements
alter session set sql_trace
alter session set events '10046 trace name context forever, level 12';
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after reading the traceout outfile it shows the Execution plan for statements directly wirtten under begin and end block and doesnot displays the plan for the statements written like this
procedure a is
cursor b is
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You have to exit sql*plus after running the procedure, example tkprof is below:
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cursor c is
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total 2 0.00 0.06 0 0 0 1
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---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
SQL*Net message from client 1 0.00 0.00
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Execute 1 0.00 0.00 0 0 0 0
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Parsing user id: 68 (recursive depth: 1)
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14 TABLE ACCESS FULL EMP
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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
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WHERE (((((((((((l.serviceContractId=:b1 AND l.LineId<>:b2)
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AND lv.EquipmentDetailId=:b5) AND lv.RouteDetailId=:b6)
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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/

How to change the explain plan for currently running query?

Hi All,
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[code]
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[/code]
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Hi
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startup wrote:
Hi,
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hi guys,
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regards
sagar

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How to capture the execution plan for a query

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