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Tools interact by sending and receiving messages over the ToolBus GUIs also have incorporated events in various degrees and fashions In the early 1980s, GUI operating systems started taking hold, first with the Apple Macintosh, then with Microsoft Windows and MIT s open source X Window System Applications developed for these operating systems are event-driven Rather than containing their own input message-processing loop, applications are reactive, doing basically nothing until the operating system notifies them of input by sending event messages All events are sent to an application s common event handler Events include an identifier, telling the application what event occurred, plus optional data about the event In the late 1980s, a number of people worked on software integration systems, which were essentially frameworks for connecting modules or programs together The Field system 11 was one of them.

You can also perform direct imports via the network using database links, without using any dump files The network mode is a means of transferring data from one database directly into another database with the help of database links and without the need to stage it on disk Fine-grained data import capability: Oracle9i offered only the QUERY parameter, which enabled you to specify that the export utility extract a specified portion of a table s rows With Data Pump, you have access to a vastly improved fine-grained options arsenal, thanks to new parameters like INCLUDE and EXCLUDE Remapping capabilities: During a Data Pump import, you can remap schemas and tablespaces, as well as filenames, by using the new REMAP_ * parameters Remapping capabilities enable you to modify objects during the process of importing data by changing old attributes to new values.

For example, the REMAP_SCHEMA parameter enables you to map all of user HR s schema to a new user, OE The REMAP_SCHEMA parameter is similar to the TOUSER parameter in the old import utility..

It used string-based messages as events to integrate windows and other tools together to implement a multiwindowed software development environment The system was based on a centralized message subscription/notification facility Tools, such as a source-code editor, could subscribe to certain types of messages, such as mouse messages Notifications could be both synchronous and asynchronous In the 1990s, Architecture Description Languages (ADLs) became popular ADLs can be viewed as an incarnation of MILs, but they re oriented more toward components and their connections Examples of ADLs are Rapide,12 Wright,13 C2,14 and ACME15 Many ADLs deal directly with events, considering them first-class citizens For example, Rapide supports the concept of sets of causal events, in which each event can provoke one or more events in a set Rapide uses the term poset (for partially ordered set) to identify a group of related events..

The SQL*Loader tool discussed in the previous chapter is primarily designed to move data into one or more tables from flat files. For exporting or importing entire schemas and even databases, you must use the Data Pump Export and Import utilities. 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

Note 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.

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.