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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

Interaction Overviews can contain any mixture of symbols from Activity, Sequence, and Communication diagrams. While Activity diagrams are good at representing business processes, Sequence and Communication diagrams are better at showing the timing details of specific use cases.

conn = DriverManager.getConnection ("jdbc:oracle:thin:@dellpe:1521:ora10gr1", "scott","tiger"); conn.setAutoCommit( false ); Statement stmt = conn.createStatement(); for( int i = 0; i < 25000; i++ ) { stmt.execute ("insert into "+ args[0] + " (x) values(" + i + ")" ); } conn.commit(); conn.close(); } } I ran the test in single user mode and the Statspack report came back with this information: Elapsed: 0.52 (mins)

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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.

Cache Sizes (end) ~~~~~~~~~~~~~~~~~ Buffer Cache: Shared Pool Size: Load Profile ~~~~~~~~~~~~ ... Parses: Hard parses:

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.

Component Wiring diagrams are new to UML 2. They use the so-called lollipop symbol to represent interfaces exposed by a component. A lollipop symbol contains a small circle connected to a line. Component Wiring diagrams make the assumption that all outgoing calls are interface-based in other words, made using the notation object.method, where object implements some interface. Outgoing calls connect to lollipops using a special connector symbol that wraps around one side of the lollipop circle, as shown in Figure 6-16.

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>

Std Block Size: Log Buffer:

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>

Figure 6-16. A simple Component Wiring diagram showing assembly connectors There are two types of connectors: assembly connectors and delegation connectors. Assembly connectors appear between components and have an outgoing call connected to a lollipop symbol, as shown in Figure 6-16. Delegation connectors show how a component handles incoming interfacebased calls internally. Figure 6-17 shows an example.

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.

Per Second --------------810.58 807.16

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:

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