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Make sure you don t confuse the AWR report with the ADDM report that you obtain by running the addmrpt.sql script. The ADDM report is also based on the AWR snapshot data, but it highlights both the problems in the database and the recommendations for resolving them.

When you run the awrrpt.sql script, you ll need to make the following choices: Choose between an HTML or plain text report. Specify the beginning and ending snap IDs. If you prefer, you can use the awrsqrpt.sql SQL script, located in the $ORACLE_HOME/rdbms/admin directory, to generate a report focusing on the performance of a single SQL statement over a range of snapshot IDs. This may be the right script to run if you re trying to analyze the performance of a specific SQL statement, instead of the entire database.

Figure 7-55. A switch table, showing the default setting The switch table tells you that in the absence of any signals to the switch s controlling Binder, pin 1 is selected. If the default setting can also be set using a signal, then the signal name should follow the word <default>, as shown in Figure 7-56.

Tip You can also use the functions AWR_REPORT_TEXT and AWR_REPORT_HTML (both belonging to the DBMS_WORKLOAD_REPOSITORY package) to get AWR reports in text and HTML format, respectively. However, Oracle recommends that you use the awrrpt.sql script (which uses the preceding two functions) to get your reports instead of directly using these functions.

The AWR reports include voluminous information, including the following: Load profile Top five timed events Wait events and latch activity Time-model statistics Operating system statistics SQL ordered by elapsed time Tablespace and file I/O statistics Buffer pool and PGA statistics and advisories Here s how you create a typical AWR report. First, run the awrrpt.sql script as shown here: SQL> @$ORACLE_HOME/rdbms/admin/awrrpt.sql Current Instance ~~~~~~~~~~~~~~~~ DB Id DB Name Inst Num Instance ----------- -------- -------- -----------877170029 ORCL 1 orcl In the next step, specify the report type, as shown in Listing 18-2. Listing 18-2. Specifying the Report Type for an AWR Report Specify the Report Type ~~~~~~~~~~~~~~~~~~~~~~~ Would you like an HTML report, or a plain text report Enter 'html' for an HTML report, or 'text' for plain text Defaults to 'html' Enter value for report_type: text Type Specified: text Instances in this Workload Repository schema ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DB Id Inst Num DB Name Instance Host ------------ -------- ------------ ------------ -----------* 877170029 1 ORCL orcl prod5 Using 877170029 for database Id Using 1 for instance number Next, you must specify the range you want the AWR report to cover by specifying the beginning and ending snapshots for the time period you chose, as in Listing 18-3.

Listing 18-3. Specifying the Report Range for an AWR Report Specify the number of days of snapshots to choose from ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~============= Entering the number of days (n) will result in the most recent (n) days of snapshots being listed. Pressing <return> without specifying a number lists all completed snapshots. Listing the last 3 days of Completed Snapshots Instance DB Name Snap Id Snap Started Snap Level ------------ ------------ --------- ----------------------- ----orcl ORCL 3254 30 Mar 2008 00:00 1 3307 01 Apr 2008 05:00 1 3308 01 Apr 2008 06:00 1 3309 01 Apr 2008 07:00 1 3310 01 Apr 2008 08:01 1 3311 01 Apr 2008 09:00 1 3312 01 Apr 2008 10:00 1 3313 01 Apr 2008 11:00 1 Specify the Begin and End Snapshot Ids Specify the Begin and End Snapshot Ids ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Enter value for begin_snap: 3309 Begin Snapshot Id specified: 3309 Enter value for end_snap: 3313 End Snapshot Id specified: 3313 Specify the Report Name Finally, select a name for the report, as shown in Listing 18-4. You can either choose the default name that s offered or specify your own name for the AWR report. Listing 18-4. Specifying the Report Name for an AWR Report The default report file name is awrrpt_1_3309_3313.txt. To use this name, press <return> to continue, otherwise enter an alternative. Enter value for report_name: Using the report name awrrpt_1_3309_3313.txt WORKLOAD REPOSITORY report for DB Name DB Id Instance Inst Num Release Cluster Host ------------ ----------- ------------ ------------ ----------- ------- -----------ORCL 877170026 orcl 1 11.1.0.6.0 NO prod2 Snap Id Snap --------Begin Snap: 3309 End Snap: 3313 Elapsed: DB Time: Time Sessions Curs/Sess ------------------- -------- ------------01-Apr-08 07:00:28 480 7,795.3 01-Apr-08 11:00:58 1,179 3,239.7 240.49 (mins) 7,999.88 (mins)