Parallel  query in Oracle 11g

We use Oracle 11g DB on windows2008R2.
We wrote very long and heavy SELECT SQL query usign several table join and sub-queries and it take very long time to get result.
We did SQL statement tuning as much as we can do so far. ( I will get the Execution Plan and ADDM, etc access right)
I today notice about Parallel query function.
Where could I write parallel hint phrases in very long SELECT SQL query ?
In each selected tables like below ?
/sample in Oracle Doc/
SELECT /*+ PARALLEL(employees 4) PARALLEL(departments 4)
       USE_HASH(employees) ORDERED */ MAX(salary), AVG(salary)
FROM employees, departments
WHERE employees.department_id = departments.department_id
GROUP BY employees.department_id;

You need to be careful with some of the examples in the docs. The example you quote includes an unnecessary join. Before considering parallel query, it should have been re-written to this:
SELECT MAX(salary), AVG(salary)
FROM employees
WHERE department_id is not null
GROUP BYdepartment_id;
Later versions of the CBO may do this re-write for you, but it is important to understand why the SQL is inefficient before throwing parallel servers at it. Are you sure that all your joins are actually necessary? (I know you are just going to say "yes", but you might want to think about it first.)

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  • Create query in Oracle 11g

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    >
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    Issue is the application: it is terminal., and you either need to kill it, or to replace it.
    Sybrand Bakker
    Senior Oracle DBA

  • Oracle 11G - Oracle AWR export import Query Statistics.

    I have Oracle 11G, i have seen the sql statements through Historical AWR option from Top Activites in performance tab. Can i export all AWR query statistics from production machine so that i can analyze all logs after importing it.
    How can i know all statistical sql ( information ) and performace of production machine ?
    any help ?

    Hello,
    have you checked the DBA_HIST* objects to see what / how was imported?
    If the awr export dosn't get the contents of the rolling buffer, then you won't see any session statistics that are only there. If you want to get the contents of the rolling buffer you have to dump the contents of it with :
    oradebug setmypid
    oradebug dump ashdump 10
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    But before doing this I suggest you read the related metalink documentation if any!!!
    Regards,
    Franky

  • Oracle 11g- Straing behaviour of query after importing from Oracle 10g

    Hi,
    I have a table in Oracle 10g as follows:
    Create Table xyz (col1 varchar2(50), col2 varchar2(50));
    With following Data
    Col1     Col2
    A     320
    A     110
    A     290
    A     380
    B     ABC
    B     256
    B     LMN
    I am running following Query
    select * from xyz
    Where Col1='A' and Col2=110
    It works fine. But when I export this table and import it in Oracle 11g. It says invlid identifier.
    But if I enclose 110 in single quotes. It works fine.
    Also If I recreate this table in Oracle 11g like
    Create table xyz1
    as select * from xyz;
    Now alos I am able to run this query smoothly.
    select * from xyz1
    Where Col1='A' and Col2=110
    What is wrong exporting this table from 10g to 11g.
    Any comments/suggestion??
    Aarbi

    The check in your where clause
    Col2=110Is comparing a string (Col2 is defined as a VARCHAR) with a numeric literal, so there will be an implicit conversion taking place from character to number. The query then fails due to the B LMN row when 'LMN' fails number conversion.
    I'm guessing there was there an index on the table in your 10g installation which would allow the query to be satisfied without checking the B ABC or B LMN rows but is not present or not used in the 11g installation so a full table scan results in an attempt to convert 'ABC' and 'LMN' to a number. Check the explain plans.
    Or it could even just be a difference in the order in which the two conditions in the where clause are evaulated between the two versions.
    The solution, as you have already found is to do a string comparision
    Col2='110'Edited by: Cyn on Dec 7, 2009 12:38 PM

  • Oracle 11G - Oracle AWR query execution time in report

    I have used AWR tool of oracle 11G. I have exported query historical statistics of production databaser using awrextr.sql and then load the exported dump file using awrload.sql script.
    Then i used awrrpti.sql and awrsqrpi.sql for generating report of sql queries. Every thing is working fine and generated reports are also very helpful, but report does not show the exact time when the query was executed. How can i get the actual time when the query was executed ?
    any help please ?

    If you would have consulted the Oracle Reference Manual to get the view descriptions, you should have your question is a rhetorical one with the answer NO.
    This is because every statement can be executed one or more times, and Oracle would need to keep track of all individual executions.
    I do agree most 'applications' do not use bind variables, and consequently only have unique statements, but Oracle didn't take that into account, and rightly so.
    Sybrand Bakker
    Senior Oracle DBA

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