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Java defines no special constructs or types at the language level to deal with events. To expose an event, a JavaBean must expose two methods to add and remove subscribers of that event. For an event named Timeout, you must name the methods addTimeoutListener and removeTimeoutListener. You might use a Fire method called FireTimeout to handle the details of firing Timeout events. Following the Java event-naming conventions, a Timeout event notification will carry a payload object of type TimeoutEvent. The class must be derived from the built-in EventObject class, and Listing 8-32 shows how it might look. Listing 8-32. A JavaBean Event Notification Payload public class TimeoutEvent extends EventObject { public TimeoutEvent(Object source) { super(source); } } Subscribers of Timeout events will need to implement the interface TimeoutListener. This interface can have an arbitrary number of methods. Listing 8-33 shows an example. Listing 8-33. A Simple JavaBean Interface for Timeout Event Subscribers public interface TimeoutListener extends EventListener { void timeoutOccurred(TimeoutEvent e); } You might implement a subscriber as shown in Listing 8-34. Listing 8-34. A Simple JavaBean Subscriber to Timeout Events public class TimeoutSubscriber implements TimeoutListener { public TimeoutSubscriber() { } public void timeoutOccurred(TimeoutEvent e) { } } The event source class can store subscribers in two ways: with a simple reference-toTimeoutListener variable, or with a collection. The latter case allows you to handle multiple listeners, and is shown in Listing 8-35. Listing 8-35. A Java Event Source Supporting Multicast Timeout Events public class TimeoutSource{ public TimeoutSource() { } private Vector timeoutListeners = new Vector();

As the preceding query and its output show, user Nicholas has locked up the Employees table. If this is preventing other users from accessing the table, you have to remove the lock quickly by killing the locking user s session. You can get the locking user s SID from the session_id column in the preceding output, and the V$SESSION view gives you the SERIAL# that goes with it. Using the ALTER SYSTEM KILL . . . command, you can then kill the offending session. The same analysis applies to a locked index, which prevents users from using the base table. For example, an attempt to create an index or rebuild it when users are accessing the table can end up inadvertently locking up the table. If there s a table or index corruption, that could cause a problem with accessing that object(s). You can quickly check for corruption by running the following statement: SQL> ANALYZE TABLE employees VALIDATE STRUCTURE CASCADE; Table analyzed. SQL>

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The redo buffer is where data that needs to be written to the online redo logs will be cached temporarily, before it is written to disk Since a memory-to-memory transfer is much faster then a memory-to-disk transfer, use of the redo log buffer can speed up database operation The data will not reside in the redo buffer for very long In fact, LGWR initiates a flush of this area in one of the following scenarios: Every three seconds Whenever someone commits When LGWR is asked to switch log files When the redo buffer gets one-third full or contains 1MB of cached redo log data For these reasons, it will be a very rare system that will benefit from a redo buffer of more than a couple of megabytes in size.

On occasion, there might be a problem because of an alarming increase in the size of one or more Oracle processes. You have to be cautious in measuring Oracle process size, because traditional UNIX-based tools can give you a misleading idea about process size. The following sections explain how to measure Oracle process memory usage accurately.

public synchronized void removeMyCustomListener(TimeoutListener l) { if (timeoutListeners.contains(l)) timeoutListeners.removeElement(l); } public synchronized void addMyCustomListener(TimeoutListener l) { if (!timeoutListeners.contains(l)) timeoutListeners.addElement(l); } protected void fireMethod1(TimeoutEvent e) { int count = timeoutListeners.size(); for (int i = 0; i < count; i++) { TimeoutListener l = (TimeoutListener) timeoutListeners.elementAt(i); l.timeoutOccurred(e); } } } The class uses a collection of type Vector to store subscribers. The Fire method iterates over the items in the Vector, calling the timeoutOccurred method of each subscriber found. The Fire method should use a clone of the original Vector while firing events, to avoid race conditions or errors in case a subscriber adds or removes subscriptions while processing a notification.

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