Fast/Unload: Difference between revisions

From m204wiki
Jump to navigation Jump to search
mNo edit summary
m (old content is duped in F/U overview)
 
(10 intermediate revisions by 2 users not shown)
Line 1: Line 1:
<var class="product">Fast/Unload</var> is a utility whose primary function is to quickly unload data from a
#REDIRECT [[Fast/Unload overview]]
<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 (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.
<var class="product">Fast/Unload</var> can either be invoked directly as a standalone load module or from a <var class="product">User
Language</var> program. When invoked as a standalone load module, <var class="product">Fast/Unload</var>
enqueues the data file in share mode unless explicitly requested otherwise. If the
enqueue fails, <var class="product">Fast/Unload</var> terminates with an error condition code. It is thus the file
manager's job to ensure that when <var class="product">Fast/Unload</var> is run as a standalone load module,
<var class="product">Model 204</var> does not have the file to be unloaded locked in exclusive mode.
The <var class="product">[[Fast/Unload User Language Interface]]</var>, purchased as a separate <var class="product">Fast/Unload</var> option,
allows one to invoke <var class="product">Fast/Unload</var> from <var class="product">User Language</var>,
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 using the <var>[[$FunLoad]]</var> function.
With this approach, an application builds a set of records to be unloaded, using standard <var class="product">User
Language</var> statements; for example, you can reduce unload time by restricting the set of
records using indexed <var class="product">Model 204</var> fields. The <var class="product">Fast/Unload</var> load module runs in a subtask
(or PST under CMS) of <var class="product">Model 204</var>.
With the <var class="product">Fast/Unload User Language Interface</var>, the processing can be performed either
synchronously or asynchronously.
A system manager can cancel or examine <var class="product">Fast/Unload</var> requests, and each user can
perform the same functions on asynchronous requests that he or she initiated.
To explore the details, see the [[:Category:Fast/Unload User Language Interface|components]] of the <var class="product">Fast/Unload User Language Interface</var>.
The <var class="product">Fast/Unload User Language Interface</var> also
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
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> documentation has yet to be [[Migration of Sirius PDF manuals|converted]] to SirWiki; the [http://www.sirius-software.com/maint/download/funr.pdf manual] and [http://sirius-software.com/maint/download/funrel46.pdf most recent release notes] are still maintained in PDF format.
However, there is a [[Fast/Unload active punch list|wishlist]] for <var class="product">Fast/Unload</var> in M204Wiki.

Latest revision as of 18:05, 16 March 2015