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The V$DB_OBJECT_CACHE view lets you see all objects (such as tables, procedures, triggers, packages, and so on), that are cached in the library cache. This is a highly useful view that indicates, for example, if an object is being reloaded multiple times because it can t be cached in the shared pool. The script shown in Listing 23-27 illustrates how you can get information on the number of executions, and whether an object is kept in the shared pool. Listing 23-27. Using the V$DB_OBJECT_CACHE View SQL> SELECT name, executions, sharable_mem, kept FROM V$DB_OBJECT_CACHE WHERE type='PACKAGE' AND owner='&OWNER' ORDER BY EXECUTIONS DESC; NAME ----------SALARY_PKG NEW_PKG STD_PKG SEL_PKG SQL> EXECUTIONS SHARABLE_MEM KEPT ---------- ------------ ---10149 23169 NO 9111 19858 NO 7550 32964 NO 4537 21549 NO

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The V$PGASTAT view is analogous the V$SGASTAT view. It shows the usage of the PGA memory. If you have the PGA_AGGREGATE_TARGET initialization parameter set, the view will also show information about the automatic PGA memory management. The following SQL statement will reveal the contents of the V$PGASTAT view: SQL> SELECT * FROM V$PGASTAT;

If you have set the PGA_AGGREGATE_TARGET initialization parameter, you can use the V$PGA_TARGET_ ADVICE view to figure out the optimal size of the PGA memory. The view contains a prediction of the cache-hit performance for various hypothetical values of the PGA_AGGREGATE_TARGET parameter.

Notice that the compiler generates a Dispose function that calls System::GC::SuppressFinalize. This helper function is provided by the FCL to ensure that the finalizer is not called for an object. The Dispose implementation passes the this handle to SuppressFinalize so that the object just disposed is not finalized. Calling Dispose and a finalizer on the same object would likely end up in double cleanup, and would also negatively impact performance. As you can see in the preceding sample code, the compiler overrides System::Object::Finalize. Instead of calling the finalization function (SampleClass::!SampleClass) directly, the override of Finalize calls the virtual function Dispose(bool). However, in contrast to the IDisposable::Dispose implementation, the finalizer passes false as the argument. Dispose(bool) is implemented so that it calls the destructor (SampleClass::~SampleClass) if true is passed, and the finalization function (SampleClass::!SampleClass) if the argument is false. This design enables derived classes to implement custom destructors and finalization functions that extend the cleanup logic of the base class.

You should be familiar with several backup-related dynamic performance tables. Some of them only list the available backup devices, backup-control file names, and data-file names. Others provide more critical information (for example, whether a data file is currently in backup mode). The following sections introduce you to the most essential backup-related dynamic performance views.

kill_plist="dhcpd:pcpu:15:30:1 sshd:pcpu:15:30:1"

The V$BACKUP_DEVICE view provides information on available devices for performing backups, but it includes only tape devices. The disk system is always available as a potential backup device, so no mention is made of it in this view. Here s the output of a simple query using the V$BACKUP_ DEVICE view: SQL> SELECT * FROM V$BACKUP_DEVICE; DEVICE_TYPE DEVICE_NAME ----------------- ----------SBT_TAPE Tape1 SQL>

The V$BACKUP view indicates which of your database files are in backup mode. In the following query, if the status column shows ACTIVE, the data file is undergoing a backup: SQL> SELECT file#, status 2 FROM V$BACKUP; FILE# STATUS ----- -------1 NOT ACTIVE 2 NOT ACTIVE 3 NOT ACTIVE 4 NOT ACTIVE 5 NOT ACTIVE 6 NOT ACTIVE 7 NOT ACTIVE 8 NOT ACTIVE 9 NOT ACTIVE 10 NOT ACTIVE 10 rows selected. SQL>

The V$BACKUP_PIECE view shows the control file information about the various backup pieces. The DELETED column in this view can have two values: YES or NO. If the value is YES, the file has been deleted already.

Contrary to what this view s name indicates, it contains only the persistent RMAN configuration settings. RMAN comes with a set of default configuration settings, which aren t shown in this command. Only the user-specified configuration settings are stored in this view:

The first field is the process command itself. This will be slightly different, and hopefully simpler, than the traditional ps -ef output. The ps -ef default output (-e for all processes, -f for formatted output) includes the commands that are running, as well as any arguments they were passed. The ps -eo comm output is formatted to include only the commands that are running on a system without any path or argument information.

SQL> SELECT name, value FROM V$RMAN_CONFIGURATION; NAME VALUE ------------------------------------ ---------------RETENTION_POLICY TO REDUNDANCY 3 DEFAULT DEVICE TYPE TO DISK SQL>