Fast/Unload overview: Difference between revisions
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<var class="product">Fast/Unload</var> is a utility | <var class="product">Fast/Unload</var> is a utility which quickly unloads | ||
data from a <var class="product">Model 204</var> | data from a <var class="product">Model 204</var> file to one or more sequential data sets. | ||
<var class="product">Fast/Unload</var> consists of several functional units: | |||
<ul> | <ul> | ||
<li> | <li>A data extraction facility which reads data from a <var class="product">Model 204</var> | ||
file. </li> | |||
<li> | <li>A compiler which converts a special data language describing | ||
the output format to machine language. | the output format to machine language. | ||
The generated machine language | The generated machine language | ||
actually performs the output function.</li> | actually performs the output function.</li> | ||
<li>A | <li>A reporting facility which provides a job log and statistics and file 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> | ||
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<var class="product">Fast/Unload</var> can either be invoked directly as a standalone load module | <var class="product">Fast/Unload</var> can either be invoked directly as a standalone load module | ||
or from a | or [[#fusi|from a SOUL]] program. | ||
When invoked as a standalone load module, <var class="product">Fast/Unload</var> | When invoked as a standalone load module, <var class="product">Fast/Unload</var> | ||
enqueues the data file in share mode unless explicitly requested otherwise. | enqueues the data file in share mode unless explicitly requested otherwise. | ||
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<var class="product">Model 204</var> does not have the file to be unloaded locked in exclusive mode. | <var class="product">Model 204</var> does not have the file to be unloaded locked in exclusive mode. | ||
<div id="fusi"></div> | |||
==Fast/Unload SOUL Interface== | ==Fast/Unload SOUL Interface== | ||
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The <var class="product">[[Fast/Unload SOUL Interface]]</var>, purchased as a separate <var class="product">Fast/Unload</var> option, | The <var class="product">[[Fast/Unload SOUL Interface]]</var>, purchased as a separate <var class="product">Fast/Unload</var> option, | ||
allows one to invoke <var class="product">Fast/Unload</var> using the <var>[[FastUnload (Recordset function)|FastUnload]]</var> or <var>[[FastUnloadTask (Recordset function)|FastUnloadTask]]</var> method | allows one to invoke <var class="product">Fast/Unload</var> using the <var>[[FastUnload (Recordset function)|FastUnload]]</var> or <var>[[FastUnloadTask (Recordset function)|FastUnloadTask]]</var> method | ||
Revision as of 19:56, 9 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 describing the output format to machine language. The generated machine language actually performs the output function.
- A reporting facility which provides a job log and statistics and file 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. 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 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.
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