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The undo tablespace can help you out with various flashback-related operations to retrieve older data, but what do you do if the older data is really old, say, from six months or a year ago Obviously, most databases don t use undo tablespaces that store undo data for that long a period. Of course, the size of the undo tablespace and the amount of undo data generated by the database determines how far back in time can you go. The purpose of the undo tablespace is to help with the rolling back of statements as well as to maintain read consistency in the database, and not to provide a historical record of all changes in data. A Flashback Data Archive is a mechanism consisting of one or more tablespaces that store transitional changes to a specified table or tables. You can t turn flashback data archiving on for the entire database, but rather must turn it on for specified tables. A Flashback Data Archive is the ideal mechanism to store all transactional changes to any table in the database over a period of time. You may want to save the data for compliance reasons or for other purposes, as I show later in this chapter. I show how to set up and use flashback data archiving in the following sections.

memory queue fails for some reason, due to an instance failure (software crash), power failure, or whatever, these in-memory queues are rebuilt from the redo logs. So, the Streams pool will only be important in systems using the Streams database feature. In those environments, it should be set in order to avoid "stealing" 10 percent of the shared pool for this feature.

You can use the CREATE FLASHBACK ARCHIVE and the DROP FLASHBACK ARCHIVE statements to create and drop a Flashback Data Archive. You use the ALTER FLASHBACK ARCHIVE statement to modify the properties of a Flashback Data Archive, such as the retention period. In the following sections, I explain the various Flashback Data Archive management tasks.

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Use the CREATE FLASHBACK ARCHIVE statement to create a Flashback Data Archive. Before you execute this statement, make sure that the tablespace you specify in the statement exists. You can specify the following when creating a Flashback Data Archive: Name of the archive Name of the first tablespace of the archive The quota for the archive in the first tablespace How far the database must retain the data Of the four parameters you can specify, only two the name of the first tablespace for the archive and the retention period for the data are mandatory. Here s an example that shows how to create a Flashback Data Archive named flash1: SQL> CREATE FLASHBACK ARCHIVE flash1 TABLESPACE test_tbs RETENTION 1 YEAR; The previous statement creates the new flashback archive flash1 and ensures that any tables you enable for archiving will be tracked and the transactional changes to data in the table will be saved for a year. After the year is up, the transactional changes will be automatically deleted, thus keeping only a year s worth of changes at a given time. In the next example, I show how to create a Flashback Data Archive that retains data for three years. In addition, I specify the QUOTA parameter to limit the amount of space that the archive can use in tablespace test_tbs. You can have more than one Flashback Data Archive in a database. In this example, I specify the DEFAULT parameter to mark this flashback archive as the default Flashback Data Archive for the database. SQL> CREATE FLASHBACK ARCHIVE DEFAULT flash1 TABLESPACE test_tbs QUOTA 5g RETENTION 3 YEAR;

scott%ORA11GR2> update emp 2 set ename = :ename, sal = :sal 3 where empno = :empno; 1 row updated. scott%ORA11GR2> commit; Commit complete. We have now very safely changed that row. It is not possible for us to overwrite someone else s changes, as we verified the data did not change between when we initially read it out and when we locked it our verification made sure no one else changed it before we did, and our lock ensures no one else can change it while we are working with it.

You can use the ALTER FLASHBACK ARCHIVE statement to alter the properties of a Flashback Data Archive, such as the size of the archive and changes in the retention time for the archived data. Here are some examples: Specify a Flashback Data Archive as the default archive for the database: SQL> ALTER FLASHBACK ARCHIVE flash1 SET DEFAULT; Add a tablespace to the archive: SQL> ALTER FLASHBACK ARCHIVE flash1 ADD TABLESPACE flash2 QUOTA 10G; Change the retention period: SQL> ALTER FLASHBACK ARCHIVE flash1 MODIFY RETENTION 5 YEAR; Purge all data from an archive: SQL> ALTER FLASHBACK ARCHIVE flash1 PURGE ALL;

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