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11 Study the output of running the block in Step 8 In particular, note these points: Two channels were used, to parallelize the operation The date given must conform to that specified by the NLS_DATE_FORMAT environment variable The restore will have been from the most recent backup earlier than the UNTIL time The recovery uses a combination of archive logs on disk, and archive logs extracted from a backup set 12 Connect to the database with SQL*Plus as user SYSTEM, and confirm that while the restore and recovery has succeeded, the row inserted after the UNTIL time is gone:

select * from ex16;

13 Confirm that the log sequence number has been reset to 1:

You can also choose Auto Select Layer from the Options bar for the Move tool, so the appropriate layer is automatically selected when you click on any part of it in the image window

select * from v$log;

If your backup strategy includes creating image copies as well as (or instead of) backup sets, then you have another option available for restore operations: do not restore at all As an image copy is byte-for-byte the same as the source datafile, it can be used immediately if it is still available on disk All that is necessary is to tell the database the location of the image copy, and then recover the copy This can result in massive time savings when compared with the delays involved in extracting a datafile from a backup set To facilitate the use of image copies, use the following RMAN command:

Photoshop allows you to lock layers entirely to prevent any edits or changes to their contents Alternatively, you can lock certain characteristics of a layer to prevent changes only in the following areas: Transparency Prevents editing any of the layer s transparent pixels; allows you to only edit the filled pixels on the layer Image Prevents editing the layer s pixels with the paint tools Position Prevents moving any of the layer s pixels

RMAN> backup as copy database;

This command will copy every datafile to the flash recovery area, as image copies To use an image copy, first take the original datafile offline (which will have happened automatically in many cases) and then update the controlfile to point to the copy, and recover it For example, if a copy has been made as follows:

RMAN> backup as copy datafile 4 format '/u02/df_copies/usersdbf';

You can recognize the difference between fully and partially locked layers by looking at the lock that appears next to the layer s name in the Layers palette a solid lock indicates a fully locked layer, while an outlined lock indicates a partially locked layer To lock a layer entirely to protect its contents from any modification, first make sure the Layers palette is visible by choosing Window | Layers Click once on the layer in the Layers palette to make it active, and click the lock icon (the fourth button after Lock in the top of the Layers palette, as shown in Figure 6-6)

Then it can be brought into use like this:

RMAN> run {sql 'alter database datafile 4 offline'; set newname for datafile 4 to '/u02/df_copies/usersdbf'; switch datafile 4; recover datafile 4; sql 'alter database datafile 4 online';}

This accomplishes a complete recovery, without actually needing to restore The SWITCH command is equivalent to the ALTER DATABASE RENAME FILE command that can be executed in SQL*Plus If the whole database has been copied to the flash recovery area then the whole database can be restored with one command:

Figure 6-6

RMAN> switch database to copy;