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Figure 18-4. The main AWR page If you want to change the general settings of the AWR, you can do so by clicking the Edit button in the General section. This will take you to the Edit Settings page, where you can modify the following: Snapshot retention intervals Snapshot collection intervals Snapshot collection levels (Typical or All) Under the Manage Snapshots and Preserved Snapshot Sets section on the main AWR page, the first line lists the total number of snapshots. This listing is a link, which you click to get to the Manage Snapshots page, which lists all the snapshots in the AWR. You can click on an individual snapshot to view complete details about it, including the capture time and the collection level. Figure 18-5 shows the snapshot details for a single AWR snapshot. If you have established an AWR baseline (which is a representative time period), you ll also see how a particular snapshot compares with that baseline. From the Manage Snapshots page, you can do the following: Create a snapshot spontaneously (using the Create button) View a list of the snapshots collected over a specific period Establish a range of snapshots to use as a baseline (using the Create Preserved Snapshot Set button) Delete a defined range of snapshots from the list of snapshots collected over a period of time (using the Delete Snapshot Range button)

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The purpose of using snapshot baselines is to have a valid measuring stick for acceptable database performance, as well as to have a reference point for various system statistics. When you say database performance is bad, you must know that it s bad compared to something you know to be good performance. You define a snapshot baseline on a pair of snapshots taken when you know that the period covered represents typical good database performance. The baseline then serves as a valid representative sample to compare with current system database performance. When you create a baseline, the AWR retains the baseline snapshots indefinitely (it won t purge these snapshots after the default period of seven days), unless you decide to drop the baseline itself. You can create a new snapshot baseline by using the CREATE_BASELINE procedure of the DBMS_WORKLOAD_REPOSITORY package. You identify the snapshots to use with the snap ID, which uniquely and sequentially identifies each snapshot. You can get the snap IDs you need to create baselines from the DBA_HIST_SNAPSHOT view. The following example creates a snapshot baseline named peak_time baseline : SQL> BEGIN DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE (START_SNAP_ID => 125, END_SNAP_ID => 185, BASELINE_NAME => 'peak_time baseline', DBID => 2210828132); END; You can drop a snapshot baseline by using the DROP_BASELINE procedure of the DBMS_ WORKLOAD_REPOSITORY package, as shown here:

SQL> BEGIN DBMS_WORKLOAD_REPOSITORY.DROP_BASELINE(BASELINE_NAME => 'peak_time baseline', CASCADE => FALSE, DBID => 2210828132); END; By setting the CASCADE parameter to TRUE, you can drop the actual snapshots as well.

0, Culture=neutral, PublicKeyToken=null When an assembly with a strong name is referenced, the assembly extern metadata also contains the PublicKeyToken: assembly extern SampleLib { publickeytoken = (65 D6 F5 D1 B5 D4 89 0E) ver 0:0:0:0 } In both cases, the path to SampleLibdll is not contained in DumpAssemblyInfo s metadata To determine the path, a special algorithm called assembly resolution is used If the referenced assembly does not have a strong name, the assembly resolver uses a simplified algorithm This algorithm depends on the so-called application base directory The application base directory is the directory in which the EXE file is located (unless you perform special customizations which is outside of this chapter s scope) The first location where the assembly resolver looks for an assembly without a strong name is the application base directory itself.

As you know, the AWR runs every hour by default, and the AWR statistics are saved for a default period of seven days. After the seven-day period, Oracle removes the snapshots, starting with the oldest ones first (excluding the baseline snapshots). Oracle estimates that if you have ten concurrent sessions, it will take between 200MB and 300MB of disk space to store the data that it saves over the standard seven-day period. You must therefore ensure that your Sysaux tablespace has at least this much free space. The number of user sessions is a key determinant of the space required for the AWR statistics.

An xterm window can be launched with a switch that allows you to specify what is displayed in the title bar of the resulting window, as shown here:

If your Sysaux tablespace runs out of space, Oracle will automatically delete the oldest set of snapshots to make room for new snapshots.