Tuning Advisor - recommendations
Dear Experts,11.2.0.3 RDBMS - I ran Setup SQL for a statement and see the three recommendations:
-Collect statistics for a table
-Implement the SQL - 99% of shows benefits profile
-Creating an Index - shows about 78% benefit.
Tuning advisor recommends that a recce to implement. We should I be implemented? Also, with the SQL profile I see 'force match' option, what it means? Appreciate your help...
Thank you
Hello
Profile SQL is generally less preferable because
(1) fixed single query
(2) it arranges without understanding the nature of the underlying problem, i.e. There is always risk of returning question in one way or another
On the option 'force game' - it just means that the profile will apply not only to the sql_id you specify, but also all other sql_id which the SQL text differs only in the values of literals. For example if you create a SQL profile for
select col1 from tab1 where col2 = 'A'
then by default will not affect the plan of
select col1 from tab1 where col2 = 'B'
but with strength match option, the profile would apply to these two statements.
About creating index - you need to evaluate the benefits for this and other queries on the cost (slower DML, increased consumption of disk space). How to set up SQL cannot do this for you.
Best regards
Nikolai
Tags: Database
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Any help will be appreciate
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941949 wrote:
BEGIN
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941949 wrote:
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--------------------------------------------------------------------------------
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----------------------------------------------------
When am running thorough db console, it works fine.(recommended to accept the sql profile) though I accepted it,the problem is the optimzer couldn't ifnd the sql profile when it runs the next time. SO iI decided to run it manually to attach the sql profile to the sql query.. Any idea why SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK( 'my_sql_tuning_task_feb') from DUAL; not displaying any records ?..where as the same in dbconsole is giving the recommendations ? Thanks KaiJust a guess. Took you LONG to a large enough value?
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