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DBMS_RLMGR is a new package that supports the Rules Manager feature. This feature lets developers use business rules to trigger specific actions, based on the occurrence of a certain event. Rules follow the Event-Condition-Action (ECA) rule semantics, whereby if a rule evaluates to TRUE, a certain event will happen automatically. For example, you may specify a rule stating that if a business customer buys more than a stated amount of services from you, that customer will be offered certain special promotions.

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You ve seen how to use the following Oracle-supplied packages in earlier chapters. Consequently, I don t provide any examples of the use of these packages in this chapter. In the following sections, I briefly discuss the packages that you ve reviewed elsewhere in this book.

The script completes by comparing the current file count to the three possible situations: Everything is normal. The file count is lower than the warning threshold. A warning state. The count is between the warning threshold and maximum limit. An error state. The count is above the maximum limit. In either the warning or error state, the script will send a notification via e-mail specifying the condition of the directory. There is one inherent problem with the e-mail notification type. If you re monitoring a mail queue directory that is filling up, it is likely that the e-mail notification will not be sent. In this case, you may want to change your notification method to use something other than e-mail such as an alpha-numeric pager or phone.

The DBMS_STATS package is a highly useful Oracle package that you use to enable statistics collection for the Oracle Optimizer. Listing 24-21 shows the important procedures of the DBMS_STATS package. Listing 24-21. The DBMS_STATS Package SQL> DESC DBMS_STATS Argument Name Type ------------------------------ ---------PROCEDURE CREATE_STAT_TABLE OWNNAME VARCHAR2 STATTAB VARCHAR2 TBLSPACE VARCHAR2 PROCEDURE EXPORT_SCHEMA_STATS OWNNAME VARCHAR2 STATTAB VARCHAR2 STATID VARCHAR2 STATOWN VARCHAR2 PROCEDURE GATHER_DATABASE_STATS ESTIMATE_PERCENT NUMBER BLOCK_SAMPLE BOOLEAN METHOD_OPT VARCHAR2 DEGREE NUMBER GRANULARITY VARCHAR2 CASCADE BOOLEAN STATTAB VARCHAR2 STATID VARCHAR2 OPTIONS VARCHAR2 STATOWN VARCHAR2 GATHER_SYS BOOLEAN NO_INVALIDATE BOOLEAN GATHER_TEMP BOOLEAN GATHER_FIXED BOOLEAN PROCEDURE GATHER_SYSTEM_STATS GATHERING_MODE VARCHAR2 INTERVAL NUMBER(38) STATTAB VARCHAR2 In/Out Default --------- --------IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN

DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT

STATID STATOWN PROCEDURE GET_TABLE_STATS OWNNAME TABNAME PARTNAME STATTAB STATID NUMROWS NUMBLKS AVGRLEN STATOWN SQL>

Code verification can identify IL code that breaks the rules of the type system For example, if you push an int on the stack and call a function that expects a System::String^ argument instead, the code verifier will complain Pointer-based access to virtual memory could also be used to bypass the security system For example, an instruction like stindi4, which can be used to modify virtual memory via a pointer, could be misused to change the state of private variables or even to overwrite return addresses or code Therefore, the IL code verifier will complain if it finds an instruction like stindi4 Using a command-line tool called PEVerifyexe, you can manually verify an assembly (PE stands for portable executable, which is the binary file format of DLLs and EXE files.

21 shows how to use the GATHER_SCHEMA_STATS, GATHER_TABLE_STATS, and GATHER_ SYSTEM_STATS procedures to collect schema, table, and system statistics for the Oracle Optimizer.

if [ $file_count -lt $2 ] then continue elif [ $file_count -ge $2 -a $file_count -lt $3 ] then echo "Warning: File count in $1 is $file_count, should be less \ than $2" | mail -s "Directory file count warning for $1" $4 else echo "Error: File count in $1 is $file_count, should be less \ than $2" | mail -s "Directory file count error for $1" $4 fi done

In 11, you saw how you could use the DBMS_RLS package to create security policies when you re implementing fine-grained access control (FGAC). You can use the DBMS_RLS package to administer FGAC.

The DBMS_FGA package provides fine-grained auditing functionality to the DBA. 11 contains a full description of fine-grained auditing using the DBMS_FGA package.

The DBMS_RESOURCE_MANAGER package helps you administer the Database Resource Manager, which is useful in allocating resources to the consumers. With the DBMS_RESOURCE_MANAGER package, you can create, drop, and switch consumer groups and manage the resource plans. 11 contains an extensive review of the use of the DBMS_RESOURCE_MANAGER package.