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Filter-based subscriptions are necessary when the subscriber wants only a subset of the notifications available. The subscriber specifies a filtering expression, and the publisher applies the filter to all the notifications generated. Those that aren t rejected by the filter are sent to the subscriber. When the filtering effort is relatively light, the publisher can often handle both the filtering and notification jobs, as shown in Figure 2-13.

As I mentioned earlier in this chapter, the interactive mode of Data Pump is quite different from the interactive export and import mode in the older utilities. Traditionally, the interactive mode gave you the chance to enter a limited set of export/import parameters at the command line in response to the queries made by the export or import utility. You use the interactive mode in the new Data Pump technology only to intervene in the middle of a running job, to either suspend the job or modify some aspects of it. You can enter the interactive mode of Data Pump Export in either of two ways: Use the Ctrl+C keyboard combination during a Data Pump Export job, if you want to enter the interactive mode from the same session where you are running the Data Pump job. Use a separate session or even a separate server to attach yourself to a running session by using what else the ATTACH command. (You can also attach to a stopped job.) When you successfully attach yourself to a job, you ll be able to use specific export parameters in an interactive mode. I use the word parameters, but you may also refer to these as interactive export commands.

Note In the Data Pump Export (and Import) utility, the only way to get into an interactive mode of operation is by using the Ctrl+C sequence or by opening another session and attaching yourself to that session. You cannot start an interactive Data Pump session from the command line.

Figure 2-13. Filtered notifications You can also use filters in conjunction with channels. In this case, the subscription identifies both the filtering expression and the channel identifying the notifications to filter. See Figure 2-14.

Let s examine when you might use the interactive mode in a Data Pump Export job. Suppose that you started a job in the evening at work and left for home. At midnight, you check the status of the job and find that it s barely moving. You can easily start another session, and then connect to the running job and monitor it by using the ATTACH command. When you do this, the running job does not pause. Instead, it opens an interactive window into the running session so you can change some parameters to hasten the crawling export job via a special set of interactive Data Pump Export commands. Using the ATTACH parameter, you can restart jobs that are stalled because of a lack of space in the file system, instead of having to start a new job from the beginning. This feature comes in especially handy when dealing with exports and imports of large amounts of data. Listing 14-6 shows an example of using the ATTACH command. Listing 14-6. Using the ATTACH Command to Attach to a Stopped Job [orcl] $ expdp system/sammyy1 ATTACH=system.sys_export_schema_01 Export: Release 11.1.0.6.0 - Production on Tuesday, 25 March, 2008 11:58:08 Copyright (c) 2003, 2007, Oracle. All rights reserved. Job: SYS_EXPORT_SCHEMA_01 Owner: SYSTEM Operation: EXPORT Creator Privs: FALSE GUID: F24953A52C006A63E0340060B0B2C268 Start Time: Monday, 14 March, 2005 11:03:03 Mode: SCHEMA Instance: orcl Max Parallelism: 1