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The FLASHBACK DATABASE command allows you to flash back or take back the database to a previous point in time. You can specify the past point in time using either the SCN or a clock time. However, it may become cumbersome to remember the exact SCNs and clock times over time. Oracle lets you create a restore point, which is a way to associate an easy-to-remember name with an SCN or a time stamp. When you use the FLASHBACK DATABASE command, you can simply use the restore point instead of having to use an SCN or a time stamp. Oracle sometimes calls the restore point an alias for a SCN. The V$RESTORE_POINT view shows all restore points in your database. Here s a simple query using the view: SQL> SELECT * FROM V$RESTORE_POINT; SCN DB_INCA GUA STORAGE TIME NAME ------- ------- ---- ------- -------------------- --------1685977 2 YES 819200 29-JUL-05 02.10.55PM RESTORE1 SQL> The third column, GUA, is an abbreviation for GUARANTEE_FLASHBACK_DATABASE, and can take a value of YES or NO. 16 shows you how to create a restore point.

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notify () { case $2 in 0) # Warn/error level and don't kill.. echo "$1: $3 process id $4 found with $5 $7. Should be less than $6." ;; 1) # Warn/error level and kill.. echo "$1: $3 process id $4 found with $5 $7. Should be less than $6." test $debug -eq 0 && kill $4 ;; 2) # Warning level only... echo "Warning: $3 process id $4 found with $5 $7. Should be less than $6." test $debug -eq 0 && kill $4 ;; 3) # Just kill, don't warn at all.. test $debug -eq 0 && kill $4 ;; *) echo "Warning: killoption not set correctly, please validate configuration." ;; esac }

You can use the V$FLASHBACK_DATABASE_LOG view to determine the ideal size of your flash recovery area, as shown in 15. Here s a typical query using this view: SQL> SELECT estimated_flashback_size, flashback_size FROM V$FLASHBACK_DATABASE_LOG; The ESTIMATED_FLASHBACK_SIZE column value tells you how much space you must allocate to your flash recovery area for the flashback logs to meet your flashback retention target.

The V$FLASHBACK_DATABASE_STAT view helps you monitor the overhead of logging flashback data in the Flashback Database logs. The view provides information about the bytes of flashback data, redo data, and bytes of data blocks read and written during an interval of time.

The V$FLASH_RECOVERY_AREA_USAGE view shows how your flash recovery area space is being used. It shows both the percentage of space that s in use and the percentage of space that s reclaimable. Here s a simple query: SQL> SELECT * FROM V$FLASH_RECOVERY_AREA_USAGE; FILE_TYPE PERCENT_SPACE_USED_SPACE_RECLAIMABLE NUMBER_OF_FILES ----------- ---------------- ----------------- --------------CONTROLFILE 0 0 0 ONLINELOG 0 0 0 ARCHIVELOG 0 0 0 BACKUPPIECE 0 0 0 IMAGECOPY 0 0 0 FLASHBACKLOG .38 0 1 SQL>

You can use all V$ views to monitor various aspects of the database instance, including its performance. However, some specific views are instrumental in judging the performance of the instance. You learned about some of these views in detail in s 21 and 22; therefore, I don t discuss those comprehensively here. The performance-monitoring views you ve already seen are V$SYSTEM_ EVENT, V$SESSION_EVENT, V$SESSION_WAIT, V$SQLAREA, V$SQL_PLAN, and V$SQLTEXT. The V$EVENT_NAME view provides the names of all wait events in the instance. The V$WAIT_STAT view provides information about the various types of block contention, including undo block contention.

Here, for ease of reference, I define all of the command-line arguments passed to this function: $1: Text passed used for building the notification string; used for the difference between warning and error $2: The kill option, which has a possible value of 0-3 $3: The process name that is being monitored $4: The process ID of the process being monitored $5: The current value of the indicator you are tracking

The V$SQL view shows usage statistics regarding SQL statements in the shared pool, and the statistics are updated after the query completes execution. For long-running queries, the statistics are usually updated every five seconds, so you can monitor their progress. The V$SQL view is an important performance-related view, and shows details about the following items, among others: