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Primitives can be harnessed to send notifications easily: When the sender wishes to send a notification, it sets the state of a primitive, which the receiver must monitor The receiver detects the state change and takes appropriate action No data need be exchanged: The notification can be just a pure signal, represented by the setting of the synchronization primitive Most distributed systems today rely on networks to connect the various systems together The network connection can be considered a shared resource Interprocess pipes are similar to network connections, but are generally much faster and more reliable But while pipes are usable only between processes running under the same OS, network connections can also connect different machines together, regardless of OS considerations Shared resource delivery protocols are common in distributed systems and are asynchronous in nature.

Note that the export in this example didn t export any rows of the tables in the pair of tablespaces you are transporting. The export specifies only which tablespaces are going to be part of your transportable tablespaces set. Only the metadata (table and index definitions) is exported to the export dump file. The export dump file, sales.dmp, will be very small, because it contains just the table definitions, column descriptions, and so forth that will help identify the objects in the tablespace when you export them to the target database.

The next step in generating the transportable tablespaces set is the physical copying of the datafiles contained in the tablespaces and the export dump file containing the metadata about the tablespaces to the target location. Before you can start importing the export dump file to the target database, make sure that the block size of the tablespace is the same as the standard block size of the target tablespace. If it isn t, the target database must have a nonstandard block size specified in its init.ora file of the same size as the block size of the tablespace you want to export. You must now copy the export dump file, sales.dmp, to the target database using FTP, remote copy (or copy, if you re using Windows), or some other means. You also copy all the datafiles that are part of the two tablespaces sales01 and sales02 to the target location, so they re accessible to the target database for importing.

They have a distinct advantage over procedure call protocols, in the form of safety: No transfer of execution control is involved, so the receiver s longevity doesn t affect the sender The sender and receiver usually run concurrently, often on different machines The sender can write.

Next, run the Data Pump Import utility (in the target database), which will plug in the tablespaces and incorporate information about them in the data dictionary of the target database. Because the export dump file doesn t have any data, all you ll be importing is the metadata about the objects. The target database will simply use the copied datafiles from the source database as the datafiles for the transported tablespaces. All you re doing is plugging the tablespaces into the target database. Listing 14-13 shows the importing of the metadata into the target database from the dump file. Listing 14-13. Performing the Transportable Tablespaces Import C:\>impdp system/sammyy1 dumpfile=sales.dmp TRANSPORT_DATAFILES='sales01_01.dbf', \ 'sales02_01.dbf' directory=dpump_dir1 Import: Release 11.1.0.6.0 - Production on Tuesday, 25 March, 2008 12:23:07 Copyright (c) 2003, 2007, Oracle. All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 Production Master table "SYSTEM"."SYS_IMPORT_TRANSPORTABLE_01" successfully loaded/unloaded Starting "SYSTEM"."SYS_IMPORT_TRANSPORTABLE_01": system/******** dumpfile=sales.dmp TRANSPORT_DATAFILES='sales01_01.dbf', 'sales02_01.dbf' directory=dpump_dir1 Processing object type TRANSPORTABLE_EXPORT/TYPE/GRANT/OBJECT_GRANT . . . C:\> As you can see, there are two parts to the import of the transportable tablespaces. First, the Data Pump Import utility will extract the metadata of the transportable tablespaces from the export dump file. After this, it will extract the various object (tables and indexes) definitions from the dump file into the target database. No data rows are actually imported into the database at this time. The data is already in the datafiles of the tablespaces, and you ve already plugged those tablespaces into the target database. The import log will show the tables that are being imported into the target database, but unlike in a normal import process, you don t see the number of rows being imported. As you can see from the examples, the transportable tablespaces feature is very powerful, because it will let you move entire tablespaces between databases by merely copying the datafiles and exporting the data dictionary information from one database to another. Compared to any of the alternatives, this is a much a faster and more efficient means of transferring very large objects.

You can transport a tablespace to a database with the same or higher compatibility setting. The two databases could be on different platforms.