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

Figure 6-17. A Component Wiring diagram showing delegation connectors The small square boxes on the border of the component are called ports. The ports that handle the incoming interfaces Venues, Tickets, Seating, and Administration are input ports. The Query

Per Transaction --------------12,564.00 12,511.00

Data dictionary views such as DBA_USERS, ROLE_ROLE_PRIVS, and ROLE_TAB_PRIVS help you find out who the users are and what their privileges are. However, those views don t help you find out what the users are doing in the database right now you need the session-related dynamic views for that. These views are some of the most useful ones you ll be using on a day-to-day basis for monitoring user sessions.

If you want to find out which of your users has been granted the SYSOPER or the SYSDBA role, you can do so by using the V$PWFILE_USERS view, as follows: SQL> SELECT * FROM V$PWFILE_USERS; USERNAME SYSDBA SYSOPER -------------------------------SYS TRUE TRUE SQL>

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.... Top 5 Timed Events ~~~~~~~~~~~~~~~~~~ % Total Event Waits Time (s) Call Time -------------------------------------------- ------------ ----------- --------CPU time 26 55.15 class slave wait 2 10 21.33 Queue Monitor Task Wait 2 10 21.33 log file parallel write 48 1 1.35 control file parallel write 14 0 .51 I included the SGA configuration for reference, but the relevant statistics are as follows: Elapsed time of approximately 30 seconds 807 hard parses per second 26 CPU seconds used

port is an output port. UML 2 allows port symbols to contain an arrow in order to make explicit the direction of control flow through a port. Delegation connectors appear as arrows with dashed lines connecting ports to objects or vice versa. A single port may delegate to multiple objects, as shown in the case of the Administration interface in Figure 6-17. Delegation connectors can also redirect incoming calls to subcomponents, as shown in Figure 6-18.

The V$SESSION_CONNECT_INFO view shows you the session authentication details for users. The following code details the V$SESSION_CONNECT_INFO view: SQL> DESC V$SESSION_CONNECT_INFO Name Null Type ----------------------------------------- -------- --------------SID NUMBER AUTHENTICATION_TYPE VARCHAR2(26) OSUSER VARCHAR2(30) NETWORK_SERVICE_BANNER VARCHAR2(4000) SQL> The important column is AUTHENTICATION_TYPE, which could hold the following values: Database, if the authentication is through the database OS, if you re using the operating system s external authentication Network, if you re using the network protocol Listing 23-28 shows the contents of the V$SESSION_CONNECT_INFO view.

Listing 23-28. Using the V$SESSION_CONNECT_INFO View SQL> SELECT * FROM V$SESSION_CONNECT_INFO; SID AUTHENTICATION OSUSER NETWORK_SERVICE_BANNER ---------------------------------------------------------------7 DATABASE SYSTEM 8 DATABASE SYSTEM 9 DATABASE salapati Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 9.2.0.1.0 Production 9 DATABASE salapati Oracle Advanced Security: Encryption service for 32-bit Windows: Version 9.2.0.1.0 Production 9 DATABASE salapati Oracle Advanced Security: crypto-checksumming service for 32bit Windows: Version 9.2.0.1.0 Produ SQL>

Now, if we were to run two of these programs simultaneously, we might expect the hard parsing to jump to about 1,600 per second (we have two CPUs available, after all) and the CPU time to double to perhaps 52 CPU seconds. Let s take a look: Elapsed: Load Profile ~~~~~~~~~~~~ Parses: Hard parses: 0.78 (mins)

The V$SESSION view gives you a wealth of information about the users, including their operating system username, terminal name, whether they re actively executing a transaction or just connected to the database, and how long their connection has been in place. In Oracle Database 10g, the V$SESSION view also contains several wait-related columns such as WAIT_CLASS_ID, WAIT_ CLASS#, WAIT_CLASS, WAIT_TIME, and SECONDS_IN_WAIT.

Figure 6-18. Delegation connectors routed to a subordinate component The delegation connectors connect the incoming and outgoing interfaces of the subordinate component to input and output ports of the main component. Component Wiring diagrams make no assumptions about how calls from ports are physically delegated to internal objects or subordinate components.

The V$SESS_IO view provides session I/O statistics. Here are the columns in this view: SQL> DESC V$SESS_IO Name ------------------SID BLOCK_GETS CONSISTENT_GETS PHYSICAL_READS BLOCK_CHANGES CONSISTENT_CHANGES SQL>

Per Second --------------1,066.62 1,064.28

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