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By default, SQL*Loader doesn t impose any limit on the number of records; therefore, all the logical records can be discarded. Using the DISCARDMAX parameter, you can set a limit on the number of records that can be discarded.

Both the bad and discard files contain records in the original format. Therefore, it s easy, especially during large loads, to just edit these files and use them for loading the data that was left out during the first load run.

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The PARALLEL parameter specifies whether SQL*Loader can run multiple sessions when you re employing the direct-path loading method. Obviously, you need a server with multiple CPUs if you wish to use the parallel load feature. sqlldr USERID=salapati/sammyy1 CONTROL=load1.ctl DIRECT=true PARALLEL=true

Using the RESUMABLE parameter, you can turn on Oracle s Resumable Space Allocation feature. This way, if a job encounters a space problem while loading the data, the load job is merely suspended. You can arrange for a notification about the job suspension and allocate more space so the job can continue without failing. The Resumable Space Allocation feature is discussed in 6. The default for the RESUMABLE parameter is false, meaning Resumable Space Allocation is disabled. Set RESUMABLE=true to enable this feature.

This idea can be expanded to include many debug statements in the code, providing output of varying levels of detail during execution. By varying the value to which $debug is compared in the test (e.g., $debug -gt 2), you can, in principle, have an unlimited number of levels of debug output, with 1 being the most simple and the highest-numbered level of your choosing being the most complex. You can, of course, create any debug-level logic you wish. In the example here, I am checking if the debug variable is greater than some specified value. If it is, the debug output is displayed. With this model, if you have various debug output levels and your debug variable is assigned a value higher than the highest debug level, all levels below that one will be displayed. Here are a few lines of code to illustrate the point:

The RESUMABLE_NAME parameter enables you to identify a specific resumable load job when you use the Resumable Space Allocation feature. The default name is the combination of the username, session ID, and instance ID. RESUMABLE_NAME = finance1_load

The RESUMABLE_TIMEOUT parameter can be set only when the RESUMABLE parameter is set to true. The timeout is the maximum length of time for which an operation can be suspended when it runs into a space-related problem. If the space-related problem is not fixed within this interval, the operation will be aborted. The default is 7,200 seconds. RESUMABLE_TIMEOUT = 3600

For example, assume the following native API: namespace NativeLib { class CryptoAlgorithm { public: virtual void Encrypt(/* .. arguments can be ignored so far .. */) = 0; virtual void Decrypt(/* .. arguments can be ignored so far .. */) = 0; }; class SampleCipher : public CryptoAlgorithm {.

The SKIP parameter is very useful in situations where your SQL*Loader job fails to complete its run due to some errors, but it has already committed some rows. The SKIP parameter lets you skip a specified number of records in the input file when you run the SQL*Loader job the second time. The alternative is to truncate the table and restart the SQL*Loader job from the beginning not a great idea if a large number of rows has already been loaded into the database tables. SKIP = 235550 This example assumes the first job failed after loading 235,549 records successfully. You can find out this information from the log file for the load, or query the table directly.

The SQL*Loader utility enables you to generate data to load columns. This means that you can do a load without ever using a data file. More commonly, however, you generate data for one or more columns of the data when you are loading from a data file. The following types of data can be generated by SQL*Loader: Constant value: You can set a column to a constant value by using the constant specification. For example, with the following specification, all the rows populated during this run will have the value sysadm in the loaded_by column: loaded_by CONSTANT "sysadm"