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So should you bind parameters by index or by name This choice comes into play only if you are using Oracle 10g. In my benchmark tests, I found no material difference in performance between binding by index and binding by name. If portability across databases is critical for you, you should bind parameters by index. Otherwise, using OraclePreparedStatement and binding by parameter name can marginally improve the readability of your code. You can (and should) also improve readability in the case of binding by parameter index by defining meaningful constants for the parameter indexes as we did here (in other examples in this book, we may not follow this convention for simplicity). However, the SQL constants for statement strings still contain the not-so-readable in this case.

After you create a new task, the next step is to set the parameters for this task. The task parameters control the recommendation process. The parameters that you can modify belong to four groups: workload filtering, task configuration, schema attributes, and recommendation options. Here is an example showing how you can set various task parameters using the SET_TASK_ PARAMETER procedure: SQL> EXECUTE DBMS_ADVISOR.SET_TASK_PARAMETER ( 'TEST_TASK', 'VALID_TABLE_LIST', 'SH.SALES, SH.CUSTOMERS'); In this example, the VALID_TABLE_LIST parameter belongs to the workload-filtering group of parameters. You are instructing the advisor (the SQL Access Advisor) to exclude all tables from the analysis except the sales and customers tables from the SH schema. The following example uses the STORAGE_CHANGE parameter from the recommendation-options group to add 100MB of space to the recommendations: SQL> EXECUTE DBMS_ADVISOR.SET_TASK_PARAMETER('TEST_TASK', 'STORAGE_CHANGE', 100000000);

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To generate a set of recommendations by any advisor, you execute the task that you created earlier, using the EXECUTE_TASK procedure of the DBMS_ADVISOR package. The EXECUTE_TASK procedure will generate recommendations, which consist of one or more actions. For example, executing the SQL Access Advisor may provide a recommendation to create a materialized view and a materialized view log. Here s how you execute a task named TEST_TASK: SQL> EXECUTE DBMS_ADVISOR.EXECUTE_TASK('TEST_TASK');

An additional issue to consider regarding public servers availability is that they may become unavailable for extended periods of time or entirely go offline without notification for reasons including maintenance, a failure, or a decision to no longer provide time service. It s not uncommon for installations relying on public servers to have their client configurations point to nonexistent IP addresses or domain names of onetime operational public timeservers. On the surface, if redundancy is properly configured, having a public timeserver become unavailable for a period of time might not represent a major disruption to your time service. However, if network administration procedures are not in place for the detection of public timeservers going offline, over a period of time you may end up relying solely on local clocks or, worse, getting your time from a single falseticker that could end up creating havoc with your record keeping. Industries where accurate timekeeping is especially critical (such as healthcare for administering drugs and maintaining patient records and emergency response for accurately reconstructing activities in life-threatening scenarios) should pay particular attention to the availability issue of the public timeservers.

Caution Under certain circumstances, previous versions of the Oracle JDBC drivers allowed binding

You can view the recommendations made by a certain task by using the GET_TASK_REPORT procedure. You can also use the DBA_ADVISOR_RECOMMENDATIONS view to check the recommendations related to a particular advisor task name: SQL> SELECT rec_id, rank, benefit FROM DBA_ADVISOR_RECOMMENDATIONS WHERE task_name = 'TEST_TASK';

REC_ID ---------1 2 3 4

RANK BENEFIT ---------- --------2 2754 3 1222 1 5499 4 594

PreparedStatement variables by name when using the standard setXXX methods. This capability to bind by name using the setXXX methods is not part of the JDBC specification, and Oracle does not support it. The JDBC drivers can throw a SQLException or produce unexpected results if you use this method, so I strongly recommend that you not use this technique.

In this example, the RANK column shows how the four recommendations stack up against each other. The BENEFIT column shows the decrease in the execution cost for each of the four recommendations.

The best way to use the management advisors is through the OEM Database Control. All you need to do is click the Advisor Central link on the Database Control home page. From the Advisor Central page, shown in Figure 18-6, you can select any of the management advisors in the database.

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