ASP.NET Web PDF Document Viewer/Editor Control Library

When the copy constructor executes, it calls the release function on the auto_handle that was passed as a constructor parameter. As explained previously, release is used to remove the wrapped handle from an auto_handle by just setting the wrapped handle to nullptr and returning the old wrapped handle. The handle returned by release is then used to initialize the handle of the new instance. To define an assignment operator, you have to use tracking references in the method declaration, too. The following code shows how the assignment operator of auto_handle is defined: auto_handle<_element_type> % operator=( auto_handle<_element_type> % _right ) { reset( _right.release() ); return *this; } void reset( _element_type ^ _new_ptr ) { if( m_handle != _new_ptr ) { if( valid() ) { delete m_handle; } m_handle = _new_ptr; } } Like the copy constructor, the assignment operator calls release on the argument it gets. This ensures that the right-hand side wraps a nullptr handle after the assignment. The released handle is passed as an argument to the reset function, which deletes the current tracking handle before it assigns the new one.

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The V$LOGFILE view provides information about each redo log file, including its name and whether the file is valid or not. The STATUS column has the following values: INVALID if the file isn t accessible STALE if the contents are incomplete NULL if the file is currently in use DELETED if the file isn t used any longer The following is a query on the V$LOGFILE view showing the status and name of the redo log files. Because its STATUS column is blank, group 1 (with one member) is the currently used redo log group. SQL> SELECT * FROM V$LOGFILE; GROUP# STATUS TYPE MEMBER ---------- ------- ------- ------------------------------3 STALE ONLINE C:\ORACLE\ORADATA\MARK1\REDO03.LOG 2 STALE ONLINE C:\ORACLE\ORADATA\MARK1\REDO02.LOG 1 ONLINE C:\ORACLE\ORADATA\MARK1\REDO01.LOG SQL> The V$LOG_HISTORY view shows you all the logs from the beginning log to the latest one, along with the high and low SCNs in each redo log.

The V$ARCHIVED_LOG view is essential when you re looking at information regarding which archive logs you have access to. The view contains one entry for every log that your database archives. When you restore an archive log, the operation inserts one row into the view for each archive log. Listing 23-29 show the output of a query using the view. Listing 23-29. Querying the V$ARCHIVED_LOG View SQL> SELECT name, thread#, sequence#, 2 archived, applied, deleted, completion_time 3* FROM V$ARCHIVED_LOG; NAME THREAD# SEQ# ARC DEL COMPLETION_TIME -----------------------------------------------------------------C:\ORACLENT\RDBMS\ARC00001.001 1 1 YES NO 07/07/2005 C:\ORACLENT\RDBMS\ARC00002.001 1 2 YES NO 07/07/2005 C:\ORACLENT\RDBMS\ARC00003.001 1 3 YES NO 07/07/2005

The debug value is for testing and the sleeptime value represents the amount of time to delay between each run The kill_plist variable is the main configuration value that lets the script know what processes and values it should be watching..

C:\ORACLENT\RDBMS\ARC00004.001 C:\ORACLENT\RDBMS\ARC00005.001 C:\ORACLENT\RDBMS\ARC00006.001 C:\ORACLENT\RDBMS\ARC00007.001 SQL>

1 1 1 1

4 5 6 7

07/07/2005 07/07/2005 07/07/2005 07/07/2005

#!/bin/sh debug=1 sleeptime=3 kill_plist="dhcpd:pcpu:15:30:1 sshd:pcpu:15:30:1"

Summary

As its name indicates, the V$ARCHIVE_DEST view shows you each archive log destination and its status. This view has a large number of columns, and you need to pay special attention to the following columns: STATUS: This column could take several values, but the important values are VALID, INACTIVE, DEFERRED, DISABLED, FULL, and ALTERNATE. BINDING: A value of MANDATORY means that the archive must be successful. A value of OPTIONAL indicates that depending on the value of the LOG_ARCHIVE_MIN_SUCCEED_DEST initialization parameter, you don t have to archive logs successfully to this destination every time. TARGET: If the TARGET column shows PRIMARY, it s referring to the local destination. If it shows STANDBY, it s pointing to a remote destination. Listing 23-30 shows a typical query using the V$ARCHIVE_DEST dictionary view. Listing 23-30. Using the V$ARCHIVE_DEST View SQL> SELECT dest_name 2 FROM V$ARCHIVE_DEST; DEST_NAME ------------------LOG_ARCHIVE_DEST_1 LOG_ARCHIVE_DEST_2 LOG_ARCHIVE_DEST_3 LOG_ARCHIVE_DEST_4 LOG_ARCHIVE_DEST_5 LOG_ARCHIVE_DEST_6 LOG_ARCHIVE_DEST_7 LOG_ARCHIVE_DEST_8 LOG_ARCHIVE_DEST_9 LOG_ARCHIVE_DEST_10 10 rows selected. SQL> The V$ARCHIVE_DEST_STATUS view provides runtime information about the archive log destinations, as shown here: SQL> SELECT dest_id, database_mode, 2 destination, 3* FROM V$ARCHIVE_DEST_STATUS; DEST_ID ---------1 2 3 4 5 DATABASE_MODE --------------OPEN OPEN OPEN OPEN OPEN RECOVER DESTINATION ------- ----------------------IDLE /u10/oradata/orcl/arch IDLE IDLE IDLE IDLE

When you re performing any kind of recovery activity, the dynamic views pertaining to recovery are indispensable. In the following sections I discuss the most important of these recovery views.