ASP.NET Web PDF Document Viewer/Editor Control Library

The Data Pump Export utility loads row data from database tables, as well as object metadata, into dump file sets in a proprietary format that only the Data Pump Import utility can read. The dump file sets, which are operating system files, contain data, metadata, and control information. Dump file sets usually refer to a single file, such as the default export dump file expdat.dmp. Quite a few of the Data Pump Import utility s features are mirror images of the Data Pump Export utility features. However, some features are exclusive to the Data Pump Import utility. In the following sections, we ll look at Dump Pump types, modes, and parameters, as well as some examples.

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You can interface with the Data Pump Export and Import utilities through the command line, using a parameter file, or interactively. Let s now examine the various methods.

Now you can see several additional items, as well as a more complete PATH variable. Another way of getting similar results is to fully qualify all paths, commands, and other files mentioned in the script called by the cron job. Supplying the full path to any element that may otherwise rely on the variables set in the interactive shell environment is a good

Performing a Data Pump export or import of data using manual methods is tedious and error-prone. OEM provides excellent export and import wizards that let you quickly perform an export or import. You can also schedule these jobs using OEM. Before you use the OEM s wizards, however, it s good to go through the manual processes to understand what s involved in using the Data Pump Export and Import utilities.

You can use the Data Pump Export utility from the command line in a manner similar to the traditional export utility. ote that by default, you specify the username/password combination after the keyword expdp. Here s a simple example: $ expdp system/manager DIRECTORY=dpump_dir1 DUMPFILE=expdat1.dmp

As you can see, the command-line option would quickly get tiring if you were doing anything but the simplest type of exports.

Rather than specifying the export parameters on the command line, you can put them in a parameter file. You then simply invoke the parameter file during the actual export. Here s an example of a parameter file: SCHEMAS=HR DIRECTORY=dpump_dir1 DUMPFILE=system1.dmp SCHEMAS=hr Once you create the parameter file, all you need to do in order to export the HR schema is invoke expdp with just the PARFILE parameter: $ expdp PARFILE=myfile.txt

private ref class XYZHandle : SafeHandle { public: XYZHandle() : SafeHandle(IntPtr::Zero, true) {} property virtual bool IsInvalid { bool get() override { return SafeHandle::handle == IntPtr::Zero; } } // this function is an override that is called within a CER [ReliabilityContract(Consistency::WillNotCorruptState, Cer::Success)] virtual bool ReleaseHandle() override { ::XYZDisconnect(SafeHandle::handle.ToPointer()); return true; } }; ... definition of class XYZConnection is discussed soon ... Like the DllImportAttribute, the SafeHandle class is defined in the namespace System::Runtime::InteropServices. It is not by accident that both types are defined in this namespace the features of SafeHandle are enabled by custom P/Invoke marshaling. This means that you have to write P/Invoke functions yourself instead of relying on the C++/CLI compiler and the linker to actually create these functions for you. This is an extra piece of work, but since C++/CLI is able to use native types in managed code, it is much less work in C++/CLI than in other .NET languages. You can write this P/Invoke function simply by modifying normal C and C++ function declarations. P/Invoke functions for XYZConnect and XYZGetData are necessary for writing the XYZConnection class: extern "C" __declspec(dllimport) HXYZ XYZConnect();

idea in general when writing scripts, since it keeps you aware of the external files you are depending on. Finally, you can replace the env command with the set command and see similar results to those in the preceding example. The output is much more extensive, but the same principle applies.

You can use all command-line export parameters in an export parameter file. The only exception is the parameter PARFILE itself.