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If you have set the PGA_AGGREGATE_TARGET initialization parameter, you can use the V$PGA_TARGET_ ADVICE view to figure out the optimal size of the PGA memory. The view contains a prediction of the cache-hit performance for various hypothetical values of the PGA_AGGREGATE_TARGET parameter.
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CHAPTER 23 THE ORACLE DATA DICTIONARY AND THE DYNAMIC PERFORMANCE VIEWS
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You should be familiar with several backup-related dynamic performance tables. Some of them only list the available backup devices, backup-control file names, and data-file names. Others provide more critical information (for example, whether a data file is currently in backup mode). The following sections introduce you to the most essential backup-related dynamic performance views.
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The V$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>
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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>
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The V$BACKUP_PIECE view shows the control file information about the various backup pieces. The DELETED column in this view can have two values: YES or NO. If the value is YES, the file has been deleted already.
V$RMAN_CONFIGURATION
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:
CHAPTER 23 THE ORACLE DATA DICTIONARY AND THE DYNAMIC PERFORMANCE VIEWS
SQL> SELECT name, value FROM V$RMAN_CONFIGURATION; NAME VALUE ------------------------------------ ---------------RETENTION_POLICY TO REDUNDANCY 3 DEFAULT DEVICE TYPE TO DISK SQL>
Session- and User-Related Views
Data dictionary views such as DBA_USERS, ROLE_ROLE_PRIVS, and ROLE_TAB_PRIVS help you find out who the users are and what their privileges are. However, those views don t help you find out what the users are doing in the database right now you need the session-related dynamic views for that. These views are some of the most useful ones you ll be using on a day-to-day basis for monitoring user sessions.
V$PWFILE_USERS
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>
V$SESSION_CONNECT_INFO
The V$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$SESSION_CONNECT_INFO view.
CHAPTER 23 THE ORACLE DATA DICTIONARY AND THE DYNAMIC PERFORMANCE VIEWS
Listing 23-28. Using the V$SESSION_CONNECT_INFO View SQL> SELECT * FROM V$SESSION_CONNECT_INFO; SID AUTHENTICATION OSUSER NETWORK_SERVICE_BANNER ---------------------------------------------------------------7 DATABASE SYSTEM 8 DATABASE SYSTEM 9 DATABASE salapati Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 9.2.0.1.0 Production 9 DATABASE salapati Oracle Advanced Security: Encryption service for 32-bit Windows: Version 9.2.0.1.0 Production 9 DATABASE salapati Oracle Advanced Security: crypto-checksumming service for 32bit Windows: Version 9.2.0.1.0 Produ SQL>
V$SESSION
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.
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