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Figure 3-3 Sending notifications through a shared resource When dealing with the shared resource delivery model, it is common to use the word message to denote the notification payload When associated with publish-subscribe systems, messages are also called message notifications, to underscore their relationship with events The arrows in Figure 3-3 denote the direction of travel of the notification signal and its associated message The sender uses a push action to write the data to the shared resource The receiver generally uses a pull action to read the message from the resource The event delivery is typically asynchronous, because the sender and receiver run in different thread or process spaces Here s a common scenario: The sender writes something to the shared resource, continuing with its work without blocking Some time later, the receiver detects the data and processes it.

You can transport a tablespace without first putting it into a read-only mode, but doing so ensures that there aren t any active transactions in that tablespace while you are transporting it.

Once you ve put both tablespaces that you want to transport in read-only mode, you have two things left to do to generate your transportable tablespaces set. First, you must use the Data Pump Export utility to generate the data dictionary metadata for the two tablespaces, sales01 and sales02. Second, you must physically copy all the datafiles in the two tablespaces and the export dump file to

a directory that the target database can access. The next two sections show you how to perform these steps.

In some cases, the receiver sends a response message back to the sender, indicating the outcome of the first operation In the response phase, the sender and receiver reverse roles Shared resources include many types of hardware configurations Historically, shared memory and shared files were the first to be used Shared memory is still widely used in multiprocessor machines today Multiple processors and/or processes are given access to a global memory, which they can use to exchange information with other processes File sharing is also used, but suffers from extremely poor performance compared to memory sharing Even so, a number of commercial application integration technologies are based on file sharing Interprocess synchronization primitives, such as semaphores and event objects, represent another type of shared resource.

The first step in creating the transportable tablespaces set is to export the metadata that describes the objects that are part of the tablespaces you want to export. Here s the interesting part about the transportable tables feature: no matter how large the tablespace is, this step is done very quickly because all you re exporting is the data dictionary information (metadata) about the objects, not their row data. You also have the option of using the parameter TTS_FULL_CHECK=Y, in which case the export utility will ensure that the tablespaces being exported are fully contained. However, you ve already ascertained this in the previous step, so you can leave out this parameter. Listing 14-12 shows the export of the metadata for the pair of tablespaces. Listing 14-12. Exporting the Dictionary Metadata for the Tablespaces [finance] $ expdp oe/oe DIRECTORY=dpump_dir1 DUMPFILE=sales.dmp TRANSPORT_TABLESPACES=sales01,sales02 INCLUDE=triggers,constraint,grant 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 With the Partitioning, OLAP, Data Mining and Real Application Testing options Starting "oe"."SYS_EXPORT_TRANSPORTABLE_01": oe/******** transport_tablespaces=sales01,sales02 include=triggers,constraint,grant directory=dpump_dir1 dumpfile=sales.dmp Processing object type TRANSPORTABLE_EXPORT/TYPE/GRANT/OBJECT_GRANT Master table "OE"."SYS_EXPORT_TRANSPORTABLE_01" successfully loaded/unloaded ****************************************************************************** Dump file set for OE.SYS_EXPORT_TRANSPORTABLE_01 is: /u01/app/oracle/dba/sales.dmp Job "OE"."SYS_EXPORT_TRANSPORTABLE_01" successfully completed at 14:36 oracle@finance.netbsa.org [/u01/app/oracle] [finance] $

Tip Don t specify the USERID parameter when you use the TRANSPORT_TABLESPACE parameter. When you omit the USERID parameter, the Data Pump Export utility will prompt you for the username. Connect by using the string connect SYS/password as SYSDBA to perform the TRANSPORT_TABLESPACE export.