Fast/Unload overview: Difference between revisions

Revision as of 22:58, 4 August 2016

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 that reads data from a Model 204 file.
A compiler that 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 (FSTATS) that 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.

Note: As of version 4.6, Fast/Unload must be running under z/OS or z/VM CMS. As of version 4.7, Fast/Unload supports EAV (Extended Attribute Volume) disks for Model 204 files and supports FILEORG X'200' files.

Fast/Unload topics

The Fast/Unload documentation consists of the pages listed below. This list is also available as a "See also" link from each of the pages.

See the release notes for information about product changes and Model 204 feature support per Fast/Unload version.

Fast/Unload topic list

Fast/Unload SOUL Interface

The Fast/Unload SOUL Interface (FUSI), 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 HPO

Fast/Unload HPO is Model 204 HPO (offloading Model 204 work to zIIP processors) extended to Fast/Unload.

Fast/Unload support for this specialty-engine processing is initially available in version 7.6 of Model 204 but only for FUSI users. This processing is available also to Fast/Unload (PGM=FUNLOAD) as of version 7.7 of Model 204.

Exploiting zIIPs in Fast/Unload requires:

z/OS, which is where the zIIP-accessing SRBs reside.
Customer authorization for the Fast/Unload HPO product, a Fast/Unload option.
Customer authorization for the Model 204 HPO product.
Appropriate setting of zIIP and Fast/Unload Model 204 system parameters.
- If Fast/Unload is invoked from FUSI, several Model 204 parameters are of concern.
- Otherwise (that is, PGM=FUNLOAD), new Fast/Unload parameters (non-FUSI-specifiable) are likely necessary.

Even if Model 204 HPO is not purchased or in use, Fast/Unload HPO offers improved performance because it locates the Fast/Unload control blocks above the bar, taking advantage of the enhanced Model 204 V7.6 64-bit addressing and ATB storage.

@@ Line 1: / Line 1: @@
-<!-- Page name: Fast/Unload overview-->
-<p></p>
 <var class="product">Fast/Unload</var> is a utility which quickly unloads
 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>
-<li>A data extraction facility which reads data from a <var class="product">Model 204</var>
+<li>A data extraction facility that reads data from a <var class="product">Model 204</var> file. </li>
-file. </li>
-<li>A compiler which converts a special data language ([[FUEL]]) to machine language.
+<li>A compiler that converts a special data language ([[FUEL]]) to machine language.
 The generated machine language performs the output function and other general-purpose manipulation.</li>
-<li>A reporting facility which provides a job log, job statistics, file statistics, and field statistics, and reports
+<li>A reporting facility ([[Fast/Unload Extraction Language (FUEL)#fst|FSTATS]]) that 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.</li>
@@ Line 41: / Line 38: @@
 {{Template: Fast/Unload topic list}}
-<div id="fusi"></div>
+==<b id="fusi"></b>Fast/Unload SOUL Interface==
-==Fast/Unload SOUL Interface==
-<!--Caution: <div> above-->
 The <var class="product">[[Fast/Unload SOUL Interface]]</var> (FUSI), 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