These AWR tables feed data to the totally reworked Enterprise Manager (EM) to produce stunning time-series displays. AWR data is used by the Automatic Database Diagnostic Monitor (ADDM) and the SQL Tuning Advisor or by using the dbms_sqltune package to make intelligent performance recommendations.

Instead of running complex scripts to track database performance over time, the Oracle10g DBA now has detailed time-series performance data immediately available for detailed analysis. These industrial strength AWR tables are a blessing for the Oracle tuning DBA. Oracle10g has new DBMS packages, such as the Oracle dbms_sqltune and dbms_mview.explain_rewrite packages, that read the wrh$ tables and carry out sophisticated performance analysis. While not artificial intelligence in the truest sense, these sophisticated tools help simplify the complex task of Oracle tuning.

For tuning multiple SQL statements, a SQL Tuning Set (STS) is created. An STS is nothing but a database object to store SQL statements with their execution context. STS can be created from a command line or the new and improvised Enterprise Manager. For the hands-on DBA, SQL Tuning Sets can be managed with Oracle dbms_sqltune package procedures.

The extra-cost Database Tuning Pack is required to access SQL Tuning Advisor PL/SQL Packages located in $ORACLE_HOME/rdbms/admin.

dbms_advisor package with "SQL Tuning Advisor" as the
value to the "advisor_name" parameter.

dbms_sqltune package

 

For more dbms_sqltune tips see: Advanced Oracle Utilities: The Definitive Reference by Rampant TechPress is written by top Oracle database experts (Bert Scalzo,  Donald Burleson, and Steve Callan).  Buy direct from the publisher and save 30%!