After stats select * arup from sales where quantity_sold 1 order by cust_id; If the plan changes in each of the executions of the SQL.
Code Listing 1: Capturing SQL plan baselines alter session set true; - First execution.
Had the comparison ratio yielded an improvement factor greater bon de reduction fnac apple than 1, SQL plan management would have accepted that plan as a candidate for the optimizer to consider.
The higher this level, the higher the reward.
You can click the Enable button if you change your mind later.Auto Purge indicates whether the plan, if unused, will automatically be deleted from the plan history after a specified amount of time.From the Database main page, choose the Server tab and then click SQL Plan Control.Suppose the plan for a SQL statement is not optimal, such as a plan that is using the sales_promo_BIX index whereas a plan using the sales_time_BIX index would be more efficient, but you cant change the code to place hints.In addition, we have decided to help you with the selection of modules and weapons!We will use a sample schema provided with Oracle Database 11 g, sHand the sales table in particular.
Changed the team distribution logic, so that is is more balanced.
By Arup Nanda, march/April 2009, have you ever been in a situation in which some database queries that used to behave well suddenly started performing poorly?
By default, capture is disabledthat is, SQL plan management does not capture the history for the SQL statements being parsed or reparsed.
And finally, we completely removed the damage to and the need for repair of all modules.The important columns on the screen are as follows: Enabled indicates whether the plan is active.The base bonus reward increases with the technological level of the ships.And thoroughly humbled by this situation, have you ever made a snap decision to stop statistics collection?In a different session, change the optimizer_mode parameter to the value that produces the desired plan, as shown in Listing.You can do that by making the plan fixed in the baseline.Note that if a plan is not used, it will be purged automatically after the retention period has passed.Remember to replace the SQL handle and the plan name with what they are in your case.Execute the SQL statement, capture the baseline as in Listing 1, and disconnect the session.Unused plans are automatically deleted from the plan history after a specified amount of time, unless auto purge is disabled.
To use evolve, on the Oracle Enterprise Manager screen shown in Figure 1, select the plan you want to compare and click the Evolve button.