ASP.NET Web PDF Document Viewer/Editor Control Library

A Data Pump Import or export job can access table data in either of two ways: Direct-path: This access uses the Direct Path API. Direct-path exports and imports lead to improved performance, since the direct-path internal stream format is the same format as the data stored in Oracle dump files. This leads to a reduced need for data conversions. External tables: The external tables feature lets Oracle read data from and write data to operating system files that lie outside the database. 13 explains external tables in detail. It is up to Oracle to decide which access method it will employ for a given job. Oracle always tries to use the direct-path method to load or unload data, but under some conditions, it may not be able to employ that method. Since direct-path access doesn t support intra-partition parallelism, external tables are used for very large data loading or unloading jobs. In the following cases, the structure of the table and/or the indexes precludes the use of direct-path access, so Data Pump will use external tables:

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I ve worked with many users who have had problems with a script they have coded and debugged for a significant amount of time, only to arrive at the conclusion that It works from the command line, but not from cron ! I have run into this problem from time to time myself, but knowing the issues tends to help you find the solution much more quickly. A script running from cron is not run in the same shell environment as a command typed at the prompt. When you log in to a machine and you are at the shell prompt, many variables need to be set to enable your interactive shell session. cron is not run from an interactive session, however. A cron job runs with only some of the shell environment variables that are set in an interactive shell session. The cron job has only a very rudimentary environment. Most problems with users cron scripts stem from the assumption that the code runs in an environment with the characteristics of an interactive session, rather than the cron environment. Here s an example to illustrate the difference. This is one of my user environments, which is displayed when I use the env command:

Clustered tables Active triggers in the tables A single partition in a table with a global index Referential integrity constraints Domain indexes on LOB columns Tables with fine-grained access control enabled in the insert mode Tables with BFILE or opaque type columns On the other hand, if your table has any LONG data, you must use the direct-path access method.

Finally, an exception of type System::ExecutionEngineException can be thrown asynchronously. MSDN documents this exception as follows: Execution engine errors are fatal errors that should never occur. Such errors occur mainly when the execution engine has been corrupted or data is missing. The system can throw this exception at any time (see http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpref/html/ frlrfsystemexecutionengineexceptionclasstopic.asp). It is also worth mentioning this exception because it shows the natural limits of .NET s reliability features. Sophisticated server products such as SQL Server 2005 can provide a certain degree of self-healing capability. For example, when the execution of a managed stored procedure causes a stack overflow, the server process itself and all managed stored procedures from other databases remain intact. Only the part of the application that caused the trouble has to be shut down. These self-healing capabilities are based on the CLR. When the CLR itself is in a bad state, you have definitely reached the limits of all these capabilities. As a result, you simply have to accept the fact that an ExecutionEngineException could be thrown. There is no sensible way to treat it. However, there is a sensible way to avoid it. Most cases of an ExecutionEngineException are not caused by the CLR itself, but by native code that illegally modifies either the internal state of the runtime or of memory on the managed heap. To avoid these illegal operations, restrict yourself to executing unsafe code in server products like SQL Server 2005 only when you really need to.

The data file format is identical in external tables and the direct-access method. Therefore, you can easily export data with one method and import it with the other method, if you wish.