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Listeners are said to handle events by providing methods that are invoked when the event source fires the event In Delphi Object Pascal, the definition is a bit more abstract: An event is a mechanism that links an occurrence to some code23 Here again, there is confusion The definition alludes to both events and notifications In C++, there is no definition for the word event, as C++ predates the recognition of events as essential interaction mechanisms C++ programmers today are likely to use the word callback when talking about events A callback is the method called in a receiver during event notification CORBA technology uses yet another lexicon In the CORBA event model, event sources and targets are known as event suppliers and consumers, respectively Events travel over channels, which represent the abstract path from supplier to consumer CORBA uses services to deliver events.

Rather than specifying the export parameters on the command line, you can put them in a parameter file. You then simply invoke the parameter file during the actual export. Here s an example of a parameter file: SCHEMAS=HR DIRECTORY=dpump_dir1 DUMPFILE=system1.dmp SCHEMAS=hr Once you create the parameter file, all you need to do in order to export the HR schema is invoke expdp with just the PARFILE parameter: $ expdp PARFILE=myfile.txt

You can use all command-line export parameters in an export parameter file. The only exception is the parameter PARFILE itself.

Several of you are probably familiar with the interactive feature of the old export and import utilities. All you needed to do during an interactive export or import was type exp or imp at the command line, and Oracle would prompt you for the rest of the information. Interactive Data Pump is quite

The Event Service was introduced first and is used in systems where event filtering and customizable QoS are not necessary The CORBA Notification Service is an extension of the Event Service, providing filtering and QoS..

different from the interactive mode of the older utilities. As you ll see in the following sections, Data Pump s interactive mode isn t meant to be used in the same way as the exp/imp interactive mode you can t start an interactive job using the Data Pump Export (or Import) utility. You can use the interactive mode only to intervene during a running job. In Data Pump Export, you use the interactive method for one purpose only: to change some export parameters midstream while the job is still running. There are two ways to get into the interactive mode. The first is by pressing the Ctrl+C combination on your keyboard, which interrupts the running job and displays the export prompt (export>) on your screen. At this point, you can deal interactively with the Export utility, with the help of a special set of interesting commands, which I ll explain later in this chapter in the Interactive Mode Export Parameters (Commands) section. The second way to enter the interactive mode of operation is by using the ATTACH command. If you are at a terminal other than the one where you started the job, you can attach to the running job by specifying the ATTACH parameter.

Note In Data Pump, the interactive mode means that the export or import job stops logging its progress on the screen and displays the export> (or import>) prompt. You can enter the special interactive commands at this point. Note that the export or import job keeps running throughout, without any interruption.