Fast/Unload overview: Difference between revisions
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The generated machine language performs the output function and other general-purpose manipulation.</li> | The generated machine language performs the output function and other general-purpose manipulation.</li> | ||
<li>A reporting facility which provides a job log | <li>A reporting facility which provides a job log, job statistics, file statistics, and field statistics, and reports | ||
any special conditions or errors that might have occurred during | any special conditions or errors that might have occurred during | ||
a run.</li> | a run.</li> | ||
Revision as of 01:00, 10 February 2015
Fast/Unload is a utility which quickly unloads data from a Model 204 file to one or more sequential data sets. Fast/Unload consists of several functional units:
- A data extraction facility which reads data from a Model 204 file.
- A compiler which converts a special data language (FUEL) to machine language. The generated machine language performs the output function and other general-purpose manipulation.
- A reporting facility which provides a job log, job statistics, file statistics, and field statistics, and reports any special conditions or errors that might have occurred during a run.
Fast/Unload can either be invoked directly as a standalone load module or from a SOUL program. When invoked as a standalone load module, Fast/Unload enqueues the data file in share mode unless explicitly requested otherwise. If the enqueue fails, the Fast/Unload terminates with an error condition code. Therefore, you must ensure that when Fast/Unload is run as a standalone load module, Model 204 does not have the file enqueued in exclusive mode.
Fast/Unload topics
- Fast/Unload invocation
- Fast/Unload program parameters
- Fast/Unload Extraction Language (FUEL)
- Fast/Unload standard #functions
- Fast/Unload BLOB/CLOB processing considerations
- Fast/Unload datetime processing considerations
- Fast/Unload DATESTAT analysis
- Fast/Unload job statistics
- Fast/Unload SOUL Interface (see below for a brief description)
- Fast/Unload with an external sort package
- Fast/Unload with DBCS data
- Fast/Unload customer-written assembler #function packages
- Fast/Unload user exits or filters
- Fast/Unload with Model 204 file groups
- Fast/Unload with the Sir2000 Field Migration Facility
- Fast/Unload floating point arithmetic and numeric conversion
- Fast/Unload program return codes
- Fast/Unload installation
- Fast/Unload customization of defaults
- Fast/Unload SMF record format
Fast/Unload SOUL Interface
The Fast/Unload SOUL Interface, purchased as a separate Fast/Unload option, allows one to invoke Fast/Unload using the FastUnload or FastUnloadTask method of the Recordset class, or using the $Funload function in a SOUL program.
With this approach, an application builds a set of records to be unloaded, using standard User Language statements; for example, you can reduce unload time by restricting the set of records using indexed Model 204 fields. The Fast/Unload load module runs in a subtask (or PST under CMS) of Model 204. Since the unload is from a Model 204 record set, the Fast/Unload SOUL Interface automatically provides the ability to unload data from a Model 204 group; standalone Fast/Unload provides that functionality by allowing multiple Model 204 file names on the OPEN statement.
The Fast/Unload SOUL Interface processing can be synchronous or asynchronous.
A system manager can cancel or examine Fast/Unload requests, and each user can perform the same functions on asynchronous requests that he or she initiated.