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Now lets capture the baselines for some SQL statement examples coming from one session.
The optimizer also still reparses the SQL statementsthe presence of a idées de cadeau anniversaire mariage baseline does not prevent thatand if the newly generated plan mastermind concours inf is not found in the plan history of the SQL, it will be added, but not as, if the newly generated plan is worse.
The line clearly shows that the newly considered plan performed worse than the original plan so it was rejected as a replacement for the optimizers best plan choice.
First you collect baselines for all SQL statements in the database by setting the system parameter to true and mark only one plan as fixed for each of the critical SQL statements.
SQL Plan Management, when SQL plan management is enabled, the optimizer stores generated execution plans in a special repository, the SQL management base.
You can make a plan fixed by executing the alter_sql_plan_baseline function in the dbms_spm package, as shown in Listing.More likely than not, you traced the cause back to a change in the execution plan.When the SQL statement is reparsed, the optimizer considers only the accepted plans in the history.When you manually load plans into a SQL plan baseline, these loaded plans are added as accepted plans.To contact technical support, please sign in to your.Some of the plans in the history can be marked as accepted.In Oracle Database 11 g, using the new SQL plan management feature, you can now examine how execution plans change over time, annales concours sous officier gendarmerie have the database verify new plans by executing them before using them, and gradually evolve better plans in a controlled manner.
If you dont want to use plans in the baseline for a SQL statement, you can use the following statement in the session prior to calling the SQL statement to disable the use of baselines: alter session set false; Listing 2 runs the same query.
Initially the optimizer chose bitmap index full scan on the sales_time_BIX index.
From the Database main page, choose the Server tab and then click SQL Plan Control.