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Except for the System tablespace, you can take any or all of the tablespaces offline that is, you can make them temporarily unavailable to users. You usually need to take tablespaces offline when a data file within a tablespace contains errors or you are changing code in an application that accesses one of the tablespaces being taken offline. Four modes of offlining are possible with Oracle tablespaces: normal, temporary, immediate, and for recovery. Except for the normal mode, which is the default mode of taking tablespaces offline, all the other modes can involve recovery of the included data files or the tablespace itself. You ll see these non-default methods discussed in 15, but for now, just keep in mind that you can take any tablespace offline with no harm by using the following command: SQL> ALTER TABLESPACE index_01 OFFLINE NORMAL; Oracle will ensure the checkpointing of all the data files in the tablespace (index_01 in this example) before it takes the tablespace offline. Thus, there is no need for recovery when you later bring the tablespace back online. To bring the tablespace online, use the following command: SQL> ALTER TABLESPACE index_01 ONLINE;

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Using the Flashback Query feature simply involves using the SELECT statement with an AS OF clause. This type of query lets you retrieve committed data as it existed at some time in the past. You can select data from the past based on a time stamp or SCN. It is common for an application to need older data for analysis purposes. A company s sales force, for example, may need older sales data but may find that it has been modified already. Even more important, sometimes a user error or faulty application code may require the restoration of older data. Right now, the most common way to go back in time is for the DBA to perform a laborious and time-consuming point-in-time database recovery, which may involve some disruption in service and a loss of critical business data. The Flashback Query feature provides you an easy way to

The ed script contains instructions to substitute the user s encrypted password with the CLOSED string. When you construct this code, you have to use a backslash to escape all occurrences of the following special characters in the encrypted password string: ., /, $, and *. See s 24 and 25 for more information on escaping special characters. These sed statements check for the specified special characters in the password string and replace all instances with the same character preceded with a backslash. This is so the shell ignores their special meanings and treats them simply as any other character.

Here s a simple example that shows how to use Flashback Query. Suppose you find that a user was accidentally deleted from your employees table around noon. The only thing you know for sure is that the employee was in the database at 8 AM. You can use a SELECT statement with the AS OF clause to find the lost data.

How far back in time you can go with a Flashback Query depends on your UNDO_RETENTION parameter setting.