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CHAPTER 14 US IN G DA TA PUMP EXPORT AND IMPORT
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Transportable Tablespaces
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Oracle s transportable tablespaces feature offers you an easy way to move large amounts of data between databases efficiently by simply moving datafiles from one database to the other. Instead of re-creating the objects, transportable tablespaces enable you to move large objects effortlessly in a fraction of the time it takes to re-create them manually in a database. Oracle strongly recommends that you use the transportable tablespaces feature wherever applicable because of its superiority to other methods of moving data between databases. Transporting tablespaces involves copying all the datafiles belonging to the source database to the target database and importing the data dictionary information about the tablespaces from the source database to the target database. Thus, the Data Pump Export and Import utilities, described in the preceding sections of this chapter, are essential players in the transportable tablespaces feature. You can also transport the index tablespaces pertaining to the tables, which makes the entire data transfer extremely fast. The whole operation will take only a little longer than the time it takes for you to copy the datafiles belonging to the tablespace to the new location, by using FTP, remote copy, or some other method such as a tape copy.
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Uses for Transportable Tablespaces
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You use transportable tablespaces mainly in the context of a data warehouse, but you can employ them in any kind of database. The following are some of the important uses of the transportable tablespaces feature: Moving data from a source database (usually OLTP) to a data warehouse Moving data from a staging database into a data warehouse Moving data from a data warehouse to a data mart Performing tablespace point-in-time recovery (PITR) Archiving historical data
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Transporting a Tablespace
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Transporting a tablespace between two databases involves the following main steps: 1. Select the tablespace to be transported (and make sure there are no dependencies with objects in other tablespaces). 2. Generate the transportable tablespace set. 3. Perform the tablespace import. This involves copying datafiles to the target server and importing related metadata into the target database. Let s go through each of these steps. Note that the tablespace you re transporting must not already exist in the target database.
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Selecting the Tablespaces to Be Transported
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The primary condition you must meet for transporting tablespaces is that the set of candidate tablespaces must be self-contained. For example, if the tables in the tablespaces have any indexes, they should be contained in one of the tablespaces in the set you re transporting. Referential integrity constraints for objects inside the tablespace being transported must not refer to objects outside the tablespace.
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C HA PTE R 14 USI NG D AT A PU MP EXPORT A ND IMPO RT
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You must meet a few other conditions when you re importing tablespaces containing partitioned tables (refer to the Oracle manual Database Administrator s Guide for the complete set of conditions). One way to verify that your set of tablespaces meets the self-contained criteria is by using the DBMS_TTS package, as follows: SQL> EXECUTE sys.dbms_tts.transport_set_check('sales01,sales02',true); PL/SQL procedure successfully completed. SQL> You must have the EXECUTE_CATALOG_ROLE role to execute the TRANSPORT_SET_CHECK procedure. The procedure TRANSPORT_SET_CHECK returns no errors, indicating that the two tablespaces in your transportable tablespaces set, sales01 and sales02, are self-contained and therefore eligible candidates for transporting. You can further confirm this by querying the transport_set_ violations table, which lists all the partially contained tables in a tablespace and any references between objects belonging to different tablespaces. SQL> SELECT * FROM sys.transport_set_violations no rows selected SQL>
Note
Instead of using the TRANSPORT_SET_CHECK procedure, you can simply use the TRANSPORT_FULL_ CHECK parameter during Data Pump export and import to specify that a certain tablespace set has no dependencies. However, during the import, you must be using the NETWORK_LINK parameter in order to use the TRANSPORT_FULL_ CHECK parameter.
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