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Let s look at a simple example of the Resumable Space Allocation feature. First, the alert log showed the following message, indicating that a DML statement was suspended because the undo tablespace ran out of space. Instead of erroring out immediately, the statement is merely suspended. Tue Feb 8 11:15:00 2005 statement in resumable session 'User PASOWNER(11), Session 173, Instance 1' was suspended due to ORA-30036: unable to extend segment by 8 in undo tablespace 'UNDOTBS_01' One the problem was corrected by adding space to the undo tablespace (UNDOTBS_01), the alert log showed the following message, indicating that the suspended statement was resumed after the problem was cleared: Tue Feb 8 11:21:52 2005 statement in resumable session 'User PASOWNER(11), Session 173, Instance 1' was resumed If space wasn t added to the undo tablespace within the timeout interval, the suspended statement would be aborted. The following entry from the alert log shows that situation: Fri Feb 4 10:29:34 2005 Errors in file /a03/app/oracle/admin/pasx/bdump/pasx_smon_7091.trc: ORA-30036: unable to extend segment by 8 in undo tablespace 'UNDOTBS_01' Fri Feb 4 10:33:07 2005 statement in resumable session 'User PASOWNER(11), Session 184, Instance 1' was aborted

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Even though this file isn t used by any system process, we want to back it up to be able to retrace our steps in case something goes wrong. I have used saved files many times to restore account information without having to use a system backup. We also want to be able to remove the older files in the backup directory.

Upon suspending an operation for a space-related problem, Oracle will automatically generate an AFTER SUSPEND system event. If you want automatic notification, you can write a trigger that will be set off by this event, as shown here: SQL> CREATE OR REPLACE TRIGGER page_dba AFTER SUSPEND ON DATABASE DECLARE PRAGMA AUTONOMOUS_TRANSACTION; BEGIN /* Code here that'll page the DBA */ COMMIT; END; Trigger created. SQL> Note that the trigger must always be declared as an autonomous transaction.

When Oracle suspends a resumable session, it automatically issues an operation-suspended alert through the automatic Server Generated Alerts feature in Oracle Database 10g. Once you fix the problem by allocating the necessary resources and the operation completes, Oracle will automatically clear this alert.

You can monitor resumable operations by using the DBA_RESUMABLE view. This view provides the name of the operation, the user s SID, the start time of the statement, the error message encountered, the suspend and resume times, and the text and current status of the SQL statements. The V$SESSION_WAIT view also provides information about suspended resumable statements. The EVENT column of this view shows you that a statement is suspended, pending the clearance of a wait error. The DBMS_RESUMABLE package contains procedures to help you manage suspended sessions. The SET_SESSION_TIMEOUT procedure, for example, allows you to specify the time a suspended session will wait before failing.

One might expect that the overload Console::WriteLine( String^ formatString, Object^ arg ) should match, because the first argument passed matches String^ and the type of the second argument is Object^, which is known as the ultimate root However, there is no standard conversion from int* to Object^ Trying to use a cast to Object^ will also fail: Console::WriteLine("pi = {0}", (Object^)pi); // error: cannot convert from int* to Object^.

Suppose you re running transactions in your database that are extremely long maybe even as long as a whole day. Oracle primarily uses locks to ensure concurrency and atomicity, but locks on a long-running transaction can reduce concurrency dramatically because other users are forced to wait for the long-running transaction to complete. Fortunately, Oracle provides the Workspace Manager, a feature you can use to version-enable tables, so different users can maintain different versions of the data. During long-running transactions, changes can be made to the same table in different workspaces, and these versions are finally reconciled and the results are stored permanently in the original table. You can think of a workspace as a virtual environment shared by several users making changes to the same data. In addition to facilitating long transactions, the Workspace Manager enables you to create multiple data scenarios for what-if analyses. It can also help you track the history of all the changes to a set of tables. The feature is especially useful in collaborative projects because it allows teams to share content.

backdate=`date +%m%d%y%H%M` test "$DEBUG" != "" && echo DEBUG: Backing up $shad to $ARCHIVE/nis_shadow.$backdate cp -p $shad $ARCHIVE/nis_shadow.$backdate find $ARCHIVE -mtime +7 -exec rm {} \;