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CHAPTER
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Using Data Pump Export and Import
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lmost all Oracle DBAs are familiar with Oracle s export and import utilities, which help in loading data into and unloading data from databases. In Oracle Database 10g, you now have newer and more refined versions of the old utilities the Data Pump Export and Import utilities. The old export and import utilities continue to be available under Oracle Database 10g, but Oracle would prefer you to use the Data Pump technology because it offers more sophisticated features. For example, you can now interrupt export/import jobs in the middle and then resume them. You can restart failed export and import jobs. You can remap object attributes to modify the objects. You can easily monitor your Data Pump jobs from a different session, and you can even modify job attributes on the fly during the course of a job. It s easy to move massive amounts of data quickly using parallelization techniques. Because Oracle provides you the APIs for the Data Pump technology, you can easily incorporate export/import jobs within PL/SQL programs. You can also use the powerful transportable tablespaces feature to transport large amounts of data quickly, even across disparate operating system platforms. This chapter provides in-depth coverage of the Data Pump technology, as well as transportable tablespaces.
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Introduction to the Data Pump Technology
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Oracle Database 10g offers the new Data Pump technology, a server-side infrastructure for fast data movement between Oracle databases. The Data Pump technology enables DBAs to transfer large amounts of data and metadata at very high speeds compared with the older export/import technology. Data Pump manages multiple parallel streams of data to achieve maximum throughput. Oracle claims that Data Pump enables you to decrease total export time by more than two orders of magnitude in most data-intensive export jobs. Imports are supposed to run 15 to 45 times faster than with the original import utility (the estimates are for single-thread operations; parallel threads will make the operations even faster). Much of the higher speed comes from using parallelism to read and write export dump files. Data Pump is a superset of the original export and import utilities, offering several new capabilities. Data Pump lets you estimate job times, perform fine-grained object selection, monitor jobs effectively, and directly load a database from a remote instance via the network. For compatibility purposes, Oracle still includes the old export and import utilities in Oracle Database 10g. Thus, you can continue to use your export and import scripts as usual, without any changes. Once you see how and why the newer Data Pump utilities are better than the older ones, you probably will choose the newer utilities, however. Oracle will eventually deprecate the original export utility, but it will support the original import utility forever. This means that you ll always have a way of importing dump files from earlier versions of Oracle. However, Data Pump Import will not work with databases that are older than the Oracle Database 10g Release 1 (10.1) version. Also note that the new Data Pump technology lets you export data only to disk. You cannot use a tape drive when performing a Data Pump export.
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CHAPTER 14 USING DATA PUMP EXPORT AND IMPORT
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Oracle Data Pump technology consists of two components: the Data Pump Export utility, to unload data objects from a database, and the Data Pump Import utility, to load data objects into a database. You access the two Data Pump utilities through a pair of clients called expdp and impdp. As their names indicate, the first of these corresponds to the export utility and the latter to the import utility. You can control both Data Pump Export and Import jobs with the help of several parameters. Here s how you invoke the two utilities: $ expdp username/password (various parameters here) $ impdp username/password (various parameters here) Unlike the old export and import utilities, the Data Pump utilities have a set of parameters you can use at the command line and a set of special commands you can use only in an interactive mode. I ll explain the main parameters, commands, and other important features of the Data Pump tool set in the Performing Data Pump Exports and Imports section later in this chapter. You can also get a quick summary of all Data Pump parameters and commands (including the interactive commands) by simply typing expdp help=y or impdp help=y at the command line. The Data Pump Export utility unloads data into operating system files known as dump files in a proprietary format that only the Data Pump Import utility can understand. You can take Data Pump Export dump files from an operating system and import them into a database running on a different platform, as you could with the older export/import utilities.
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