This section describes how to collect the post-change SQL performance data using Oracle Enterprise Manager.
To create a post-change SQL trial using Enterprise Manager:
On the Guided Workflow page, click the Execute icon for the Create SQL Trial in Changed Environment step.
The Create SQL Trial page appears.
In the SQL Trial Name field, enter the name of the SQL trial.
In the SQL Trial Description field, enter a description of the SQL trial.
In the Creation Method list, determine how the SQL trial is created and what contents are generated by performing one of the following actions:
Select Execute SQLs Locally.
The SQL trial generates both execution plans and statistics for each SQL statement in the SQL tuning set by actually running the SQL statements locally on the test system.
Select Execute SQLs Remotely.
The SQL trial generates both execution plans and statistics for each SQL statement in the SQL tuning set by actually running the SQL statements remotely on another test system over a public database link.
Select Generate Plans Locally.
The SQL trial invokes the optimizer to create execution plans locally on the test system without actually running the SQL statements.
Select Generate Plans Remotely.
The SQL trial invokes the optimizer to create execution plans remotely on another test system over a public database link without actually running the SQL statements.
For each of these creation methods, the application schema and data should already exist on the local or remote test system.
In the Per-SQL Time Limit list, determine the time limit for SQL execution during the trial by performing one of the following actions:
Select 5 minutes.
The execution will run each SQL statement in the SQL tuning set up to 5 minutes and gather performance data.
Select Unlimited.
The execution will run each SQL statement in the SQL tuning set to completion and gather performance data. Collecting execution statistics provides greater accuracy in the performance analysis but takes a longer time. Using this setting is not recommended because the task may be stalled by one SQL statement for a prolonged time period.
Select Customize and enter the specified number of seconds, minutes, or hours.
Ensure that the system change you are testing has been performed on the test system, and select Trial environment established.
In the Schedule section:
In the Time Zone list, select your time zone code.
Select Immediately to start the task now, or Later to schedule the task to start at a time specified using the Date and Time fields.
Click Submit.
The Guided Workflow page appears when the execution begins.
The status icon of this step changes to a clock while the execution is in progress. To refresh the status icon, click Refresh. Depending on the options selected and the size of the SQL workload, the execution may take a long time to complete. After the execution is completed, the Status icon will change to a check mark and the Execute icon for the next step is enabled.
Once the post-change performance data is built, you can compare the pre-change SQL trial to the post-change SQL trial by running a comparison analysis, as described in Comparing SQL Trials .