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able to rely on public servers and you should be looking at purchasing a dedicated stratum 1 primary timeserver. For accuracy requirements in milliseconds, the recommendation is to monitor the dispersion levels if you are using public servers. For accuracy requirements in seconds, you should be fine relying on public servers. That s unless you have the statistical misfortune to synchronize with multiple falsetickers beyond the ability of the NTP algorithms to detect that condition!

The ADDM, of course, is the most important all-around tuning advisor in the database, and it provides access to the automatic diagnostic capabilities of the Oracle database. Apart from the ADDM, there are two purely SQL-tuning-related and SQL-performance-related advisors: SQL Tuning Advisor: This advisor analyzes complex SQL statements and recommends ways to improve performance. The SQL Tuning Advisor bases all its work on internal statistics and may include suggestions to collect new statistics as well as to restructure SQL code. In Oracle Database 11g, the SQL Tuning Advisor runs automatically during the daily maintenance windows. This advisor is referred to as the Automatic SQL Tuning Advisor during these runs, and it selects high-load SQL statements and generates recommendations on tuning them. I discuss the SQL Tuning Advisor in 19.

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SQL Access Advisor: This advisor mainly provides you advice on creating new indexes, materialized views, or materialized view logs. You provide the advisor with a representative workload in order to get its advice. I discuss the SQL Access Advisor in 7.

This is the sample execution output of the DemoPreparedStatementQuery program: B:\code\book\ch05>java DemoPreparedStatementQuery ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521)(HOST=rmeno n-lap))(CONNECT_DATA=(SID=ora10g))) Case 1: bind parameter by index Statement: select empno, ename, job from emp where job = and hiredate < printing query results ... 7369 7876 7900 7934 SMITH CLERK ADAMS CLERK JAMES CLERK MILLER CLERK

Most of the database alert messages in the OEM also contain a link to specific management advisors. Thus, you can invoke a management advisor directly from the alert message itself.

Oracle Database 11g has two space-related advisors: Segment Advisor: This advisor allows you to perform growth-trend analyses on various database objects. This advisor also helps you perform object shrinkage, thus helping you reclaim unused space in your database. The Segment Advisor automatically runs during the maintenance window and recommends candidate objects for shrinking, as well as objects that are candidates for a reorganization operation due to issues such as excessive row chaining. Undo Advisor: This advisor bases its activities on system usage statistics, including the length of the queries as well as the rate of undo generation. The Undo Advisor facilitates Oracle s Automatic Undo Management (AUM) feature. It helps you to correctly size your undo tablespace and to correctly size the undo retention interval.

You can manage all aspects of the management advisory framework easily using the Database Control interface. You can also use the DBMS_ADVISOR package to create and manage tasks for each of the management advisors.

Case 2: bind parameter by name Statement: select empno, ename, job from emp where job = :job and hiredate < :hir edate printing query results ... 7369 7876 7900 7934 SMITH CLERK ADAMS CLERK JAMES CLERK MILLER CLERK

You can invoke any of the management advisors through the OEM interface, using various wizards like the SQL Access Advisor Wizard, and this is my suggested way to use any of the advisors. However, there are times when you may need to invoke an advisor programmatically, in which case you can use the DBMS_ADVISOR package to manage modules in the advisory framework. The methods for creating a task, adjusting task parameters, performing the analysis, and reviewing the recommendations are common to all advisors.

These are the steps you must follow to use the DBMS_ADVISOR package to manage various advisors: 1. Create a task. 2. Set the task parameters. 3. Generate the recommendations. 4. Review the advisor s recommendations. I describe these steps in detail in the following sections.

The first step in using an advisor is creating a task. A task is where the advisor stores all its recommendation-related information. You create a task using the CREATE_TASK procedure, as shown here: SQL> VARIABLE task_id NUMBER; SQL> VARIABLE task_name VARCHAR2(255); SQL> EXECUTE DBMS_ADVISOR.CREATE_TASK ('SQL Access Advisor', :task_id, :task_name);

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