ASP.NET Web PDF Document Viewer/Editor Control Library

The log file provides a wealth of information about the load, but Oracle also allows you to trap the exit code after each load run. This enables you to check the results of the load when you run it

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One of the major goals of .NET is language interoperability. If you wrap a native library, language interoperability is of special importance because the clients of the wrapper library are likely developers using C# or other .NET languages. As defined in 1, the Common Language Infrastructure (CLI) is the base specification of .NET. An important aspect of this specification is the Common Type System (CTS). Even though all .NET languages share the same type system, not all .NET languages support all features of that type system. To provide a clear definition of language interoperability, the CLI contains the Common Language Specification (CLS). The CLS is a contract between developers writing .NET languages and developers writing language-interoperable class libraries. The CLS specifies what CTS features a .NET language should support at least. To ensure that a library can be used by all .NET languages that conform to the CLS, the set of CLS features is the upper limit for all parts of a class library that are visible outside of an assembly. These are all public types and all members of public types that have public, public protected, or protected visibility. The CLSCompliantAttribute can be used to express that a type or type member is CLScompliant. By default, types that are not marked with this attribute are considered to be

through a cron job or a shell script. For a Windows server, you may use the at command to schedule the load job. Here are the key exit codes for the UNIX/Linux operating systems: EX_SUCC 0 indicates that all the rows were loaded successfully. EX_FAIL 1 indicates that there were command-line or syntax errors. EX_WARN 2 indicates that some or all rows were rejected. EX_FTL 3 indicates operating system errors.

So far, you have looked at the SQL*Loader utility from the point of view of a conventional load. As you recall, the conventional loading method uses SQL INSERT statements to insert the data into the tables one bind array size at a time. The direct-path loading option doesn t use the SQL INSERT statement to put data into the tables; rather, it formats Oracle data blocks and writes them directly to the database files. This direct-write process eliminates much of the overhead involved in executing SQL statements to load tables. Since the direct-path loading method doesn t contend for database resources, it will load data much faster than a conventional data load. For larger data loads, the direct-path loading method works best, and it may be the only viable method of loading data into tables for the simple reason that a conventional load may require more time than is available. Besides the obvious advantages of a shorter load time, direct loading also helps you rebuild indexes and presort table data. Using the direct-path loading method as opposed to the conventional loading method has the following advantages: The load is much faster than in the conventional loading method because you aren t using SQL INSERT statements for the load. The direct load uses multiblock asynchronous I/O for database writes, so the writing is fast. You have the option of presorting data using efficient sorting routines with the direct load. By setting the UNRECOVERABLE=Y parameter, you can avoid the writing of any redo during a direct load. By using temporary storage, you can build indexes more efficiently during a direct load than when you re using the conventional load method.

Table 10-2 displays availability of variables that are assigned within the loop (secondvar) once the loop has completed. These variables can have values assigned to them from the initial variable (firstvar), since that variable is accessible within the loop or from any other assignment inside the loop.

A conventional load will always generate redo entries, whereas the direct-path loading method will generate redo only under specific conditions. A direct load also won t fire any insert triggers, unlike the conventional load, which fires the triggers during the load. Users can t make any changes when a table is being loaded using a direct load, unlike in a conventional load.

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