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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.

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 person checks some papers for an upcoming meeting. As the elevator travels, it notifies the passenger of progress using a numeric readout display in the elevator and issuing a beep. The interaction between the passenger (the caller) and the elevator (the callee) is transparent and uses pushed feedback in the form of beeps sent from the callee to the caller.

Per Second --------------6.58 0.17

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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>

Per Transaction --------------26.33 0.67

Example 15 A laser printer uses heat to fix toner ink to paper. Before loading paper into the paper

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.

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:

Top 5 Timed Events ~~~~~~~~~~~~~~~~~~ % Total Event Waits Time (s) Call Time -------------------------------------------- ------------ ----------- --------CPU time 11 89.11 log file parallel write 48 1 9.70 control file parallel write 4 0 .88 log file sync 5 0 .23 log buffer space 2 0 .05 The amount of CPU time is about 2 to 2.5 times the amount reported by the single-user test case.

Text of the SQL statements that are executing in the database Number of users executing a particular SQL statement Total number of rows processed by a SQL statement Number of parses and number of executions that took place on an object since it was brought into the library cache Application, concurrency, PL/SQL execution, and user I/O wait time (in microseconds) Elapsed and CPU time (in microseconds) used by a cursor for parsing, executing, and fetching

path, SysCon must turn on the heater in the toner Fuser unit and wait for a certain temperature to be reached. The Fuser measures the temperature using a sensor, and fires temperature notifications for each five-degree Celsius change detected. It sends the notifications to SysCon. When the correct temperature is reached, SysCon starts the print process. Figure 9-12 shows the system.

Oracle recommends that you use the new V$SQLSTATS view, instead of V$SQL, when fetching statistics for Tip SQL cursors. Although the V$SQLSTATS view contains a subset of columns from the V$SQL and V$SQLAREA views, it s faster and retains SQL information even after the cursor is removed from the shared pool.

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