Fast/Unload overview

Fast/Unload is a utility whose primary function is to quickly unload data from a Model 204 data file to one or more sequential data sets. The Fast/Unload utility consists of several functional units. One unit is a data extraction facility which reads data from a Model 204 data file. Another unit is a compiler which converts a special data language describing the output format to machine language. The generated machine language actually performs the output function. A third unit is a reporting facility which provides a job log 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 User Language 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. It is thus the file manager's job to ensure that when Fast/Unload is run as a standalone load module, Model 204 does not have the file to be unloaded locked in exclusive mode.

Fast/Unload User Language 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 the $Funload function in a User Language 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.

With the Fast/Unload SOUL Interface the processing can be performed either synchronously or asynchronously.

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.

See Fast/Unload SOUL Interface for more information about the Fast/Unload SOUL Interface.

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
• 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