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We are now ready to take a look at Flashback Database in action. I use SQL commands in this example, but you can also use RMAN to perform the same steps. For this example, we will first create a table called persons and load it with some test data. Follow these steps: 1. Create the table: SQL> CREATE TABLE persons AS SELECT * FROM persons@prod; Table created. SQL> 2. Get a count of the total number of rows in the new table: SQL> SELECT COUNT(*) FROM persons; COUNT(*) ---------32768 3. Find out the current SCN of the database: SQL> SELECT current_scn FROM V$DATABASE; CURRENT_SCN ----------5965123 4. Perform an INSERT, doubling the number of rows in our persons table, as shown here: SQL> INSERT INTO persons SELECT * FROM persons; 65536 rows created. SQL> 5. Verify the data insertion as follows: SQL> SELECT COUNT(*) FROM persons; COUNT(*) -------------65536 Our goal is to flash the database back to the point in time when the persons table held 32,768 rows. In effect, this means flashing back to the SCN 5965123. Follow these steps: 1. Shut down the database and start it up again in the mount exclusive mode, as shown here: SQL> SHUTDOWN IMMEDIATE; SQL> STARTUP MOUNT; ORACLE instance started. . . . Database mounted. SQL>

SQL> 2 3 4 5*

ALTER TABLESPACE test01 RENAME DATAFILE '/u01/app/oracle/test01.dbf' TO '/u02/app/oracle/test01.dbf';

public delegate void GetEmployeesHandler(Envelope theEnvelope); public event GetEmployeesHandler OnGetEmployees; public object[] FireGetEmployees() { if (OnGetEmployees == null) return null; Envelope envelope = new Envelope(); OnGetEmployees(envelope); return envelope.Contents; } } In many situations, it may be convenient to strongly type the contents of an envelope. The Add and Contents fields would then be defined with a specific type, such as String or Employee. You can also use an envelope to carry information from the event source to the event handlers. You can make the envelope values read-only to prevent subscribers from inadvertently or maliciously changing the incoming envelope contents. You can set the values using arguments passed to the Envelope constructor. Listing 4-5 shows an Envelope with a read-only field called UserId. The field UserId is read-only, because it has a getter method but not a setter method. Listing 4-5. An Envelope Class That Exposes a Read-Only Property to Notification Handlers public class Envelope1 { // ... private string userId; public string UserId { get {return userId;} } public Envelope1(string theUserId) { userId = theUserId; } } The envelopes shown thus far allow subscribers to inspect the values added by other subscribers. Listing 4-6 shows an envelope variant that prevents this. Listing 4-6. An Envelope That Prevents Subscribers from Seeing Each Other s Returned Values public class SecureEnvelope { private ArrayList contents; public void Add(Object theObject) { contents.Add(theObject); }

By default, all Oracle tablespaces are both readable and writable when created. However, you can specify that a tablespace cannot be written to by making it a read-only tablespace. The command to do so is simple: SQL> ALTER TABLESPACE test01 READ ONLY; If you want to make this read-only tablespace writable again, you can use the following command: SQL> ALTER TABLESPACE test01 READ WRITE;

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 datafile 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 datafiles or the tablespace itself. 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 datafiles 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;

public SecureEnvelope(ArrayList theArrayList) { contents = theArrayList; } } The SecureEnvelope class no longer exposes its internal collection to subscribers, or anyone else, for that matter. The event source is expected to create the collection and pass it to the SecureEnvelope constructor. After all subscribers are notified, the event source can then inspect the items in the ArrayList.