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Undo data is the information needed to reverse the effects of DML statements It is often referred to as rollback data, but try to avoid that term In earlier releases of Oracle, the terms rollback data and undo data were used interchangeably, but from 9i onward they are different: their function is the same, but their management is not Whenever a transaction changes data, the preupdate version of the data is written out to a rollback segment or to an undo segment The difference is crucial Rollback segments can still exist in an 11g database, but with release 9i of the database Oracle introduced the undo segment as an alternative Oracle strongly advises that all databases should use undo segments rollback segments are retained for backward compatibility, but they are not referenced in the OCP exam and are therefore not covered in this book To roll back a transaction means to use data from the undo segments to construct an image of the data as it was before the transaction occurred This is usually done automatically to satisfy the requirements of the ACID test, but the flashback query capability (detailed in 19) leverages the power of the undo mechanism by giving you the option of querying the database as it was at some time in the past And of course, any user can use the ROLLBACK command interactively to back out any DML statements that were issued and not committed The ACID test requires, first, that the database should keep preupdate versions of data in order that incomplete transactions can be reversed either automatically in the case of an error or on demand through the use of the ROLLBACK command This type of rollback is permanent and published to all users Second, for consistency, the database must be able to present a query with a version of the database as it was at the time the query started The server process running the query will go to the undo segments and construct what is called a read-consistent image of the blocks being queried, if they were changed after the query started This type of rollback is temporary and only visible to the session running the query Third, undo segments are also used for transaction isolation This is perhaps the most complex use of undo data The principle of isolation requires that no transaction can be in any way dependent upon another, incomplete transaction In effect, even though a multiuser database will have many transactions in progress at once, the end result must be as though the transactions were executing one after another The use of undo data combined with row and table locks guarantees transaction isolation: the impossibility of incompatible transactions Even though several transactions may be running concurrently, isolation requires that the end result must be as if the transactions were serialized EXAM TIP Use of undo segments is incompatible with use of rollback segments: it is one or the other, depending on the setting of the UNDO_ MANAGEMENT parameter.

The code behind the Healing Brush tool uses Photoshop s Image Cache to perform the behind-thescenes computation necessary for these tools Choose Edit | Preferences | Image Cache to check your settings To avoid problems, leave it at the default setting of 4

Exercise 8-7: Use Undo Data In this exercise, you will investigate the undo configuration and usage in your database Use either SQL*Plus or SQL Developer 1 Connect to the database as user SYSTEM 2 Determine whether the database is using undo segments or rollback segments with this query:

select value from v$parameter where name='undo_management';

This should return the value AUTO If it does not, issue this command, and then restart the instance:

To use the Patch and Healing Brush tools to remove blemishes or other areas from an image, first make sure the image you want to edit is open in Photoshop and the layer containing the area you want to edit is active in the Layers palette Then, select either the Healing Brush or the Patch tool, depending on how you want to remove the area

alter system set undo_management=auto scope =spfile;

3 Determine what undo tablespaces have been created, and which one is being used with these two queries:

select tablespace_name from dba_tablespaces where contents='UNDO'; select value from v$parameter where name='undo_tablespace';

Sometimes, when you are working with large, multilayered, graphically intense images, you will find that even though you have all the gigabytes in the world, Photoshop is still asking for more memory or it s acting a bit sluggish Why does this happen Photoshop utilizes memory for every action completed (you will see this noted in the History palette) Photoshop also utilizes memory to enable users to use the Undo command Each time you copy an item, memory is also used up Here are some tips for streamlining your memory

4 Determine what undo segments are in use in the database, and how big they are:

select tablespace_name,segment_name,segment_id,status from dba_rollback_segs; select usn,rssize from v$rollstat;

To free memory used by the Undo command, the History palette, or the Clipboard, select Edit | Purge and choose the item type or buffer you want to clear If already empty, the item type or buffer is dimmed