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Uses for Data Pump Export and Import
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The SQL*Loader tool discussed in the previous chapter is designed to move data into or out of one or a few tables at the most. For exporting or importing entire schemas and even databases, the Data Pump Export and Import utilities are ideal. Here are some of the main uses of the Data Pump tools: Migrating databases from development to test or production Copying test data from development/testing databases to production or vice versa Transferring data between Oracle databases on different operating system platforms Backing up important tables before you make any changes to them Backing up databases Moving database objects from one tablespace to another Transporting tablespaces between databases Reorganizing fragmented table data Extracting the DDL for tables and other objects such as stored procedures and packages
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Data Pump doesn t create a perfect backup, because you won t have up-to-the-minute data in the export file when a disaster occurs. However, for smaller databases and individual tablespace exports, data exports are still viable as a backup tool.
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CHAPTER 14 USING DATA PUMP EXPORT AND IMPORT
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As you ll see, the Data Pump Export and Import utilities are extremely versatile and easy to use. You can export just the DDL for objects if you wish, or you can export and import the objects with the data. You also have the choice of exporting and importing a single table (or even a part of a single table), all the tables in a tablespace, an entire schema, or an entire database.
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On the surface, expdp and impdp are quite similar to the traditional export and import utilities. However, while they are syntactically similar to the Data Pump clients, exp and imp are ordinary user processes that use SQL statements like SELECT, INSERT, and CREATE. In contrast, the new Data Pump utilities are more like control processes that initiate jobs. In Data Pump Export and Import, the database instance handles the Data Pump utilities. The Data Pump technology consists of three major components: DBMS_DATAPUMP package: This is the main engine for driving data dictionary metadata loading and unloading. The DBMS_DATAPUMP package (Data Pump API) contains the guts of the Data Pump technology in the form of procedures that actually drive the data loading and unloading jobs. The contents of this package perform the work of both the Data Pump Export and Import utilities. DBMS_METADATA package: To extract and modify metadata, Oracle provides the DBMS_METADATA package (Metadata API), which has been available since Oracle9i. In the traditional export and import utilities, the metadata of the objects is included in the export dump file. In Data Pump technology, you need to use the DBMS_METADATA package to extract the appropriate metadata. Command-line clients: The two command-line utilities expdp and impdp correspond to the old exp and imp utilities. The expdp utility invokes the Data Pump Export utility, and the impdp utility invokes the Data Pump Import utility. The dump files you create with these new utilities aren t compatible with the older export/import utilities. Note that both packages DBMS_DATAPUMP and DBMS_METADATA act as APIs (the Data Pump API and the Metadata API), in the sense that you can use either of them directly in your programs to load and unload data without accessing the expdp and impdp clients.
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A Data Pump Import or export job can access table data in either of two ways: Direct-path: This access uses the Direct Path API. Direct-path exports and imports lead to improved performance, since the direct-path internal stream format is the same format as the data stored in Oracle dump files. This leads to a reduced need for data conversions. External tables: The external tables feature lets Oracle read data from and write data to operating system files that lie outside the database. 13 explains external tables in detail. It is up to Oracle to decide which access method it will employ for a given job. Oracle always tries to use the direct-path method to load or unload data, but under some conditions, it may not be able to employ that method. Since direct-path access doesn t support intra-partition parallelism, external tables are used for very large data loading or unloading jobs. In the following cases, the structure of the table and/or the indexes precludes the use of direct-path access, so Data Pump will use external tables:
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