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In an Oracle database, the datafiles that make up the SYSTEM tablespace and the currently active undo tablespace (as specified by the UNDO_TABLESPACE parameter) are considered to be critical Damage to any of these will result in the instance terminating immediately Furthermore, the database cannot be opened again until the damage has been repaired by a restore and recover exercise Damage to the other datafiles, which make up tablespaces for user data, will not as a rule result in the instance crashing Oracle will take the damaged files offline, making their contents inaccessible, but the rest of the database should remain open How your application software will react to this will depend on how it is structured and written TIP Is it safe to run your application with part of the database unavailable This is a matter for discussion with your developers and business analysts, and an important point to consider when deciding on how to spread your segments across tablespaces If your backups were done with RMAN, the restore and recovery operation of a damaged datafile will be completely automatic RMAN will carry out the restore in the most efficient manner possible, making intelligent use of full and incremental backups and then applying the necessary archive logs If RMAN is linked to a tape library through SBT channels, it will load the tapes automatically to extract the files it needs The restore and complete recovery of a datafile can succeed only if all the archive log files generated since the last backup of the datafile are available Either they must still be on disk in the archive log destination directories, or if they have been migrated to tape, they must be restored during the recovery operation RMAN will do the extract from a backup set and restore to disk automatically If for some reason an archive log file is missing or corrupted, the recovery will fail, but since archive log destinations and RMAN backup sets can and should be multiplexed, you should never find yourself in this situation If you do, the only option is a complete restore, and an incomplete recovery up to the missing archive, which will mean loss of all work done subsequently Exercise 16-3: Recover from Loss of a Noncritical Datafile with Database Control First, create a tablespace and a segment within it, and back it up Then simulate damage to the datafile Diagnose the problem and resolve it The database will stay open for use throughout the whole exercise At various points you will be asked to supply host operating system credentials, if you have not saved them in previous exercises: give a suitable Windows or Unix login, such as the Oracle owner.

1 Connect to your database as user SYSTEM using SQL*Plus, and create a tablespace For example, on Windows,

SQL> create tablespace noncrit datafile 'C:\APP\ORACLE\ORADATA\ORCL\noncritdbf' size 2m;

The longer I work on a file in Photoshop, the more layers I add After a certain amount of time, however, I always go back and group as many layers as possible into layer sets Using layer sets in Photoshop is similar to using folders to organize the files on your hard drive There are several additional benefits to using layer sets: Layer sets help to clean up the Layers palette by reducing clutter You can easily move, hide, lock, delete, or duplicate all the layers within a layer set, in most cases with a single click You can apply attributes such as adjustment layers and masks to an entire group of layers in a layer set

or on Unix,

SQL> create tablespace noncrit datafile '/app/oracle/oradata/orcl/noncritdbf' size 2m;

2 Create a table within the new tablespace and insert a row into it:

Double-click the layer name in the Layers palette and type the new layer name right within the Layers palette

SQL> create table ex16 (c1 date) tablespace noncrit; SQL> insert into ex16 values(sysdate); SQL> commit;

3 Using Database Control, connect to your database as user SYSTEM PART III 4 From the database home page, take the Availability tab, then the Schedule Backup link in the Manage section 5 In the Schedule Backup window, select the Tablespaces radio button in the Customized Backup section Click SCHEDULE CUSTOMIZED BACKUP 6 In the Schedule Backup: Tablespaces window, click ADD 7 In the Tablespaces: Available Tablespaces window, select the radio button for your new NONCRIT tablespace, and click SELECT 8 In the Schedule Customized Backup: Tablespaces window, click NEXT 9 In the Schedule Customized Backup: Options window, leave everything on defaults and click NEXT 10 In the Schedule Customized Backup: Settings window, leave everything on defaults and click NEXT 11 In the Schedule Customized Backup: Schedule window, select One Time (Immediately) radio button and click NEXT 12 In the Schedule Customized Backup: Review window, study the script and click SUBMIT JOB to run the backup 13 Simulate a disk failure by corrupting the new datafile On Windows, open the file with Windows Notepad, delete a few lines from the beginning of the file, and save it; it is important to use Notepad because it is one of the few Windows utilities that will ignore the file lock that Oracle places on datafiles On Unix you can use any editor you please, such as vi Make sure that the characters deleted are at the start of the file, to ensure that the file header is damaged 14 Flush the buffer cache, so that the next read of ex16 will need to read from disk:

When you create a new layer set, you can specify the blending mode of the set By default, Photoshop sets the blending mode to Pass Through, to indicate that each layer within the set should use its own characteristics and blending mode If you change the blending mode for the entire layer set, the layers within that set are treated as a single image or composite before being blended with the rest of the image according to that blending mode For more information about blending modes, refer to Blending Modes earlier in the chapter

alter system flush buffer_cache;

15 Confirm that the file is damaged by attempting to query the table:

SQL> select * from ex16; select * from ex16 * ERROR at line 1: ORA-01578: ORACLE data block corrupted (file # 7, block # 9) ORA-01110: data file 7: 'C:\APP\ORACLE\ORADATA\ORCL\NONCRITDBF'