.NET/ASP.NET/C#/VB.NET PDF Document SDK

Although the OEM Database Control interface provides an easy way to manage database alerts, there may be times when you need to incorporate certain changes inside a PL/SQL program. At times like this, you can use the Oracle-supplied DBMS_SERVER_ALERT package to set up and modify thresholds on various database metrics. The DBMS_SERVER_ALERT package has two main procedures: GET_THRESHOLD and SET_THRESHOLD. You use the SET_THRESHOLD procedure to define threshold settings for a database metric. Listing 18-1 shows the structure of the SET_THRESHOLD procedure. Listing 18-1. The SET_THRESHOLD Procedure of the DBMS_SERVER_ALERT Package SQL> DESC DBMS_SERVER_ALERT.SET_THRESHOLD PROCEDURE dbms_server_alert.set_threshold Argument Name Type In/Out Default ------------------------------ ----------------------- -METRICS_ID BINARY_INTEGER IN WARNING_OPERATOR BINARY_INTEGER IN WARNING_VALUE VARCHAR2 IN CRITICAL_OPERATOR BINARY_INTEGER IN CRITICAL_VALUE VARCHAR2 IN OBSERVATION_PERIOD BINARY_INTEGER IN CONSECUTIVE_OCCURRENCES BINARY_INTEGER IN INSTANCE_NAME VARCHAR2 IN OBJECT_TYPE BINARY_INTEGER IN OBJECT_NAME VARCHAR2 IN

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MYHOME=`grep "^$MYID:" /etc/passwd | cut -d: -f6` if [ -f $MYHOME/.xauth.$MYID ] then cat $MYHOME/.xauth.$MYID | $XAUTH nmerge DISPLAY=`cat $MYHOME/.xdisp.$MYID` export DISPLAY fi fi

You can turn off all metric-based alerts by setting both the warning value and the critical value to NULL.

In the SET_THRESHOLD procedure described in Listing 18-1, the WARNING_VALUE and CRITICAL_ VALUE refer to the warning and critical threshold values for an alert. To find out the current warning and critical thresholds for a database metric, you use the DBMS_ALERT.GET_THRESHOLD procedure.

The preceding output shows that three assemblies have been loaded. All assemblies have an identity (FullName), which consists of the following four parts: Simple name: The simple name is the name of the assembly without the file extension. (In theory, it is possible to have assemblies with names that differ from the file name, but this aspect is ignored here.) Version: .NET assemblies have a built-in support for versioning. Therefore, the second part of an assembly name is the version number. It consists of four distinct parts of 16-bit size called major, minor, build, and revision. In many cases, an assembly s version number can be relevant for assembly loading. To specify the version number of an assembly, a line like the one following must be added to your code: [assembly: AssemblyVersionAttribute("1.0.0.0")]; In Visual Studio projects, you will find a line like this in a file called AssemblyInfo.cpp. Details of the syntax are discussed later, in the context of attributes. Culture: The third part is the Culture. .NET assemblies have a built-in localization support. Assemblies with Culture != neutral should not contain any code, but only localized resources. Assemblies with localized resources are called satellite assemblies. For more information on satellite assemblies, consult the MSDN documentation.

In addition to using the DBMS_SERVER_ALERT package, you can also use procedures from the DBMS_AQ and DBMS_AQADM packages to directly access and read alert messages in the alert

In order to provide a SQL workload, you can use any one of the methods mentioned previously. In this example, the workload is created by providing three SQL statements that become part of the SQL cache. Connect as the SH user, and run the SQL statements shown in Listing 5-19. Listing 5-19. Providing a SQL Workload for the SQL Access Advisor SQL> SELECT c.cust_last_name, SUM(s.amount_sold), SUM(s.quantity_sold) FROM sales s, customers c, products p WHERE c.cust_id = s.cust_id AND s.prod_id = p.prod_id AND c.cust_state_province IN ('Texas','New Jersey') SQL> SELECT c.cust_id, SUM(amount_sold) FROM sales s, customers c WHERE s.cust_id= c.cust_id GROUP BY c.cust_id; SQL> SELECT SUM(unit_cost) FROM costs GROUP BY prod_id;

In a Network Information Service (NIS) environment, you ll want to change the MYHOME command to get the value from the appropriate NIS map. Once the home directory is known, we can determine whether the .xauth.$MYID file exists. If it exists, we import .Xauthority and DISPLAY information into the current shell environment. Once again, you may want to check for the existence of the display file instead of assuming it exists. The root user should now be able to start X client applications and have them display on the user s X server.

The SQL Access Advisor can be resource-hungry and thus adversely affect your production database perTip formance. To avoid this, simply collect the necessary workload-related data from the production database and use one of your test databases to run the SQL Access Advisor s analysis and recommendation steps.