ASP.NET Web PDF Document Viewer/Editor Control Library

By default, all metadata is compressed before it s written out to an export dump file. You can disable compression by specifying a value of NONE for the COMPRESSION parameter, as shown here: $ expdp hr/hr DIRECTORY=dpump_dir1 DUMPFILE=hr_comp.dmp COMPRESSION=NONE The COMPRESSION parameter can take one of two values: METADATA_ONLY or NONE. There is no way for you to specify the compression of the actual export data itself.

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public ref class XYZConnection { [DllImport("XYZLib.dll")] static XYZHandle^ XYZConnect(); [DllImport("XYZLib.dll")] static double XYZGetData(XYZHandle^ xyzHandle); XYZHandle^ xyzHandle; public: XYZConnection() { xyzHandle = XYZConnection::XYZConnect(); } ~XYZConnection() { delete xyzHandle; } double GetData() { if (this->xyzHandle->IsInvalid) throw gcnew ObjectDisposedException("XYZConnection"); return XYZConnection::XYZGetData(this->xyzHandle); } }; There is an important limit of SafeHandle that you must be aware of. The P/Invoke layer marshals SafeHandle-derived types to a native handle of the native pointer size 32-bit on a 32-bit CLR and 64-bit on a 64-bit CLR. If the wrapped native API works with handles that have a different size, SafeHandle must not be used. As an example, the Event Tracing for Windows API uses 64-bit handles, even in the Win32 API. For more information on this API, consult the documentation of the RegisterTraceGuids function. If your wrapper library explicitly allows callers with restricted CAS permissions (which is not covered in this book), I highly recommend using SafeHandle, because it avoids a special exploit: the handle-recycling attack. For more information on handle-recycling attacks, see http://blogs.msdn.com/bclteam/archive/2006/06/23/644343.aspx and www. freepatentsonline.com/20060004805.html.

Whenever I write a script to be run from cron, my goal is to have the script emit output only if a debug flag has been set. Normal usage would not display any output. This way the crontab entry sends mail only when error messages are generated. Additionally, I would redirect the script s output (stdout) to /dev/null. If any error messages were to be created, they would still be sent to the user for diagnostic purposes. The following modified form of the unsafe cron job discussed previously would yield the desired result:

The export mode-related parameters are FULL, SCHEMAS, TABLES, TABLESPACES, TRANSPORT_TABLESPACES, and TRANSPORT_FULL_CHECK. You ve already seen all these parameters except the last one, TRANSPORT_ FULL_CHECK, in the Data Pump Export Modes section earlier in this chapter. The TRANSPORT_FULL_CHECK parameter checks to make sure that the tablespaces you are trying to transport meet all the conditions to qualify for the transportable tablespaces job. Using this parameter, you can specify whether to check for dependencies between objects inside the transportable set and the other objects in the database. For example, an index is entirely dependent on the table, since it doesn t have any meaning without the table. However, a table isn t dependent on an index, since the table can exist without an index. You can set the TRANSPORT_FULL_CHECK parameter to a value of Y or N. If you set TRANSPORT_FULL_ CHECK=Y, the Data Pump Export job will check for two-way dependencies. If you have a table in the transportable tablespace but not its indexes, or your tablespace contains indexes without their tables, the export job will fail. If you set TRANSPORT_FULL_CHECK=N, the Data Pump Export job will check for one-way dependencies. If your transportable tablespace set contains tables without their indexes, the export will succeed. However, if the set contains indexes without their tables, the

Data Pump contains several parameters related to export filtering. Some of them are substitutes for old export parameters; others offer new functionality. Let s look at these important parameters in detail.

By using the CONTENT parameter, you can filter what goes into the export dump file. The CONTENT parameter can take three values: ALL exports both table data and table and other object definitions (metadata). DATA_ONLY exports only table rows. METADATA_ONLY exports only metadata. Here s an example: $ expdp system/manager DUMPFILE=expdat1.dmp CONTENT=DATA_ONLY

The CONTENT=METADATA_ONLY option is equivalent to the ROWS=N option in the original export utility.