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As you ve seen, Oracle automatically places DML locks on tables that are in the process of having some of their rows modified by a transaction. In addition, such a transaction simultaneously holds a table-level DDL lock on the table, which will prevent other transactions from altering or dropping the table while its DML transactions aren t yet completed. You can also place DDL locks on tables when you are conducting a purely DDL operation, without any accompanying DML transaction.

By default, a DDL lock request won t wait for a DML lock. That is, the DDL lock request will fail automatically if it s unable to acquire an immediate DML lock on the table. You can, however, use the ddl_lock_timeout initialization parameter to specify the duration for which a DDL statement will wait for a DML lock. Since the default value of the ddl_lock_timeout parameter is zero, DDL statements won t wait at all for a DML lock. You can set the parameter up to the maximum value of 1,000,000 seconds, which is about 11 and a half days. Here s an example that shows how to set the parameter inside a session: SQL> ALTER SESSION SET ddl_lock_timeout = 30; Session altered. SQL>

NavigatorFolders: Occupies the left pane when the Folders mode is selected. It displays a hierarchical list of folders on the C: hard drive. NavigatorSearch: Occupies the left pane when the Search mode is selected. It displays a group of controls for running file searches. ContentFileList: Occupies the right pane and shows a list of folders and files. ContentSearchResults: Occupies the right file pane and shows a list of files that satisfy the search criteria. FormMenuToolBar: Hosts the main menu and the toolbar at design time. At run time, the menu and toolbar move over to FormMain. StatusBar: Consists of a gray strip that can display text messages. The UI of SystemBrowser is hosted in a form called FormMain, which is used as a simple container to host the rest of the UI elements. FormMain controls the layout of the screen elements using a series of panels. The panels control the position and size of the various screen areas. Each panel hosts an object that contains the required UI elements for that area. Figure 11-5 shows how various panels are layered on the main form.

Whenever you add a column to a table, the database needs to acquire an exclusive DML lock on that table. You can specify that a DDL command wait for a specific length of time before it fails, when it s unable to acquire a DML lock. The LOCK TABLE statement lets you specify the maximum length of time a DDL statement can wait for the acquiring of a DML lock on a table. Use this feature when adding a column that is frequently updated by users. Here s the syntax of the LOCK TABLE statement: LOCK TABLE . . . IN lockmode MODE [NOWAIT | WAIT integer]

In the LOCK TABLE statement, the MODE parameter values NOWAIT and WAIT mean the following: If you want the database to return control to you immediately upon finding that a necessary table is already locked by other users, specify the NOWAIT option. You can use the wait parameter to specify the number of seconds the LOCK TABLE statement can wait in order to acquire a DML lock. You can set the value of this parameter to any integer value you want there s no limit. If you don t specify either WAIT or NOWAIT, the database will wait until the locked table is available and then lock it before returning control to you.

Latches are internal mechanisms that protect shared data structures in the SGA. For example, data dictionary entries are accessed in the buffer by many processes, and latches control the processes access to these memory structures. The data structures that list the blocks currently in memory are also frequently consulted during the running of the Oracle instance, and server and background processes that need to change or read the data in critical data structures such as these would acquire a very short lock (called a latch, in this instance) on the object. The implementation of latches, including the specification of how long a process will wait for it, is usually specific to the operating system. Data dictionary locks are used by Oracle whenever the dictionary objects are being modified. Distributed locks are specialized locking mechanisms used in a distributed database system or in the Oracle Real Application Clusters (RAC) environment. Internal locks are used by Oracle to protect access to structures such as datafiles, tablespaces, and rollback segments.