Fast/Unload: Difference between revisions
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<var class="product">Fast/Unload</var> is a utility whose primary function is to quickly unload data from a | <var class="product">Fast/Unload</var> is a utility whose primary function is to quickly unload data from a | ||
Model 204 data file to one or more sequential data sets. | <var class="product">Model 204</var> data file to one or more sequential data sets. | ||
The <var class="product">Fast/Unload</var> utility consists of several functional units. One unit is a data extraction facility which reads data from a <var class="product">Model 204</var> data file. Another unit is a compiler which converts a special data language | The <var class="product">Fast/Unload</var> utility consists of several functional units. One unit is a data extraction facility which reads data from a <var class="product">Model 204</var> data file. Another unit is a compiler which converts a special data language (FUEL) to machine language. The generated machine language | ||
actually performs the output function. A third unit is a reporting facility which provides a | 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 | job log and reports any special conditions or errors that might have occurred during a | ||
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allows one to invoke <var class="product">Fast/Unload</var> from User Language, | allows one to invoke <var class="product">Fast/Unload</var> from User Language, | ||
using the <var>[[FastUnload (Recordset function)|FastUnload]]</var> or <var>[[FastUnloadTask (Recordset function)|FastUnloadTask]]</var> functions of | using the <var>[[FastUnload (Recordset function)|FastUnload]]</var> or <var>[[FastUnloadTask (Recordset function)|FastUnloadTask]]</var> functions of | ||
the <var>[[Recordset class|Recordset]]</var> class or the [[$FunLoad]] function . | the <var>[[Recordset class|Recordset]]</var> class or the <var>[[$FunLoad]]</var> function. | ||
With this approach, an application builds a set of records to be unloaded, using standard User | 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 | Language statements; for example, you can reduce unload time by restricting the set of | ||
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The <var class="product">Fast/Unload User Language Interface</var> also | The <var class="product">Fast/Unload User Language Interface</var> also | ||
provides the ability to unload data from a Model 204 group. | provides the ability to unload data from a <var class="product">Model 204</var> group. | ||
The standalone <var class="product">Fast/Unload</var> load module | The standalone <var class="product">Fast/Unload</var> load module | ||
can also unload a group of files, although without access to group definitions in <var class="product">Model 204</var>. | can also unload a group of files, although without access to group definitions in <var class="product">Model 204</var>. | ||
The <var class="product">Fast/Unload</var> manual has not yet been converted; it still is maintained in [http://www.sirius-software.com/maint/download/funr.pdf PDF format]. | The <var class="product">Fast/Unload</var> manual has not yet been [[Migration of Sirius PDF manuals|converted]] to SirWiki; it still is maintained in [http://www.sirius-software.com/maint/download/funr.pdf PDF format]. | ||
Revision as of 14:31, 23 June 2012
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 (FUEL) 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, 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.
The Fast/Unload User Language Interface, purchased as a separate Fast/Unload option, allows one to invoke Fast/Unload from User Language, using the FastUnload or FastUnloadTask functions of the Recordset class or the $FunLoad function. 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. With the Fast/Unload User Language 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. To explore the details, see "Components of the Fast/Unload User Language Interface".
The Fast/Unload User Language Interface also provides the ability to unload data from a Model 204 group. The standalone Fast/Unload load module can also unload a group of files, although without access to group definitions in Model 204.
The Fast/Unload manual has not yet been converted to SirWiki; it still is maintained in PDF format.