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Figure 11-5. The layered panels used to create SystemBrowser s UI layout The Folders and Search navigators are both hosted by panelNavigator. Only one navigator is visible at any given time. The Folders and Search content panes are hosted by panelContent. Again, only one content pane is visible at any given time. FormMain has only two public methods: ShowFolders and ShowSearch. These methods control which set of navigator-content controls are shown at a given time. FormMain has no idea what the hosted controls actually do. FormMain doesn t interact with those controls in any way. Figure 11-6 shows the class diagram of top-level classes.

Oracle automatically applies the necessary locks to the tables and other objects based on the transactions that are coded in the applications. Oracle s locking mechanism works automatically to ensure statement-level read consistency and concurrency. For the most part, Oracle s default, behind-the-scenes locking operations should suffice, but there occasionally may be situations when the application developer will be better off manually locking tables. Sometimes when the transaction needs to see consistent data across many joined tables, the application developer can use explicit locking. In addition, when you don t want the data values changed during long transactions, it may sometimes be necessary for the application developer to apply explicit locks. Oracle provides explicit locking features to override the implicit locks placed by Oracle on behalf of transactions. You can override Oracle s default (implicit) locking mechanism at the transaction level or the session level. If you want to override all Oracle s default locking mechanisms, you can do so by using the SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement at the session level. The same statement will also override the default locking modes at the transaction level. In addition, you can manually lock a table by explicitly using a table lock or by using the SELECT FOR UPDATE command.

A blocking lock occurs when a lock placed on an object by a user prevents or blocks other users from accessing the same object or objects. The DBA_BLOCKERS table is useful in getting this information it tells you which sessions are currently holding locks on objects for which some other object is presently waiting. You can combine the information in the DBA_BLOCKERS table with that in the V$SESSION tables, to find out who is holding the blocking session. Here is the SQL statement:

NavigatorFolders +Populate() +SelectFolder() +GotoParentFolder() ContentFileList +Populate() +Add() +ShowIcons() +ShowDetails() +Clear()

SQL> SELECT a.username, a.program, a.sid, a.serial# 2 FROM v$session a, dba_blockers b 3 WHERE a.sid = b.holding_session; SQL> The following is a simple example of a blocking session: user nick alapati issues the following DML statement, but doesn t commit it: SQL> DELETE FROM emp WHERE name='samalapati'; 1 row deleted. SQL> User nina alapati, in the meanwhile, issues an identical statement, but when she executes it, it hangs: SQL> DELETE FROM emp WHERE name='samalapati'; The second user s DML statement will hang because the first user hasn t committed yet, and thus holds a row-level lock on the row the second user is trying to change. When the first user rolls back or commits, the second user s session automatically moves forward and finishes. You can use the V$SESSION view to find out which sessions are blocking other sessions. Here s a simple query using the view that shows the blocking lock caused by the previous two SQL statements: SQL> SELECT username, blocking_session blocking_session_status FROM V$SESSION WHERE blocking_session_status='VALID'; When you do find a blocking session, and it is blocking another session from doing its job, you may have to terminate the blocking session by using the ALTER SYSTEM KILL SESSION command. If the process or the session still won t go away, go to the operating system level and kill the process or the thread that spawned the Oracle session.

Oracle Web Conference (OWC), the latest means of support from Oracle, provides for collaboration between you and Oracle Support. OWC allows the Oracle Support engineers to monitor the issues and problems within your own environment using both telephone and the Web to troubleshoot. You can download the archives of the web conference afterward.