Fast/Unload overview: Difference between revisions
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<!-- Page name: Fast/Unload overview--> | <!-- Page name: Fast/Unload overview--> | ||
<var class="product">Fast/Unload</var> is a utility whose primary function is to quickly unload | <var class="product">Fast/Unload</var> is a utility whose primary function is to quickly unload | ||
data from a <var class="product">Model 204</var> data file to one or more sequential data sets. | data from a <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 | 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> | <ul> | ||
data file. | <li>One unit is a data extraction facility which reads data from a <var class="product">Model 204</var> | ||
Another unit is | data file. </li> | ||
<li>Another unit is | |||
a compiler which converts a special data language describing | 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. | actually performs the output function.</li> | ||
A third unit is a reporting facility which provides a job log and reports | |||
<li>A third unit is a reporting facility which provides a job log and reports | |||
any special conditions or errors that might have occurred during | any special conditions or errors that might have occurred during | ||
a run. | a run.</li> | ||
< | </ul> | ||
<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 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. | ||
| Line 24: | Line 28: | ||
job to ensure that when <var class="product">Fast/Unload</var> is run as a standalone load module, | 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. | <var class="product">Model 204</var> does not have the file to be unloaded locked in exclusive mode. | ||
==Fast/Unload | ==Fast/Unload SOUL Interface== | ||
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 FastUnload or FastUnloadTask 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 | ||
of the Recordset class or the $Funload function in a | of the <var>Recordset</var> class, or using the <var>[[$Funload]]</var> function in a SOUL program. | ||
With this approach, an application builds a set of records to be unloaded, | With this approach, an application builds a set of records to be unloaded, | ||
using standard | using standard SOUL statements; for example, you can reduce unload | ||
time by restricting the set of records using indexed <var class="product">Model 204</var> fields. | 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 | The <var class="product">Fast/Unload</var> load module runs in a subtask | ||
(or PST under CMS) of <var class="product">Model 204</var>. | (or PST under CMS) of <var class="product">Model 204</var>. | ||
| Line 37: | Line 42: | ||
the <var class="product">Fast/Unload SOUL Interface</var> automatically | the <var class="product">Fast/Unload SOUL Interface</var> automatically | ||
provides the ability to unload data from a <var class="product">Model 204</var> group; standalone <var class="product">Fast/Unload</var> provides that functionality by allowing | provides the ability to unload data from a <var class="product">Model 204</var> group; standalone <var class="product">Fast/Unload</var> provides that functionality by allowing | ||
multiple <var class="product">Model 204</var> file names on the | multiple <var class="product">Model 204</var> file names on the <var>OPEN</var> statement. | ||
< | |||
The <var class="product">Fast/Unload SOUL Interface</var> <i>processing can | |||
be | be synchronous or asynchronous</i>. | ||
A system manager can | A system manager can | ||
cancel or examine <var class="product">Fast/Unload</var> requests, and each user | 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 | can perform the same functions on asynchronous requests that he or she | ||
initiated. | initiated. | ||
See [[Fast/Unload SOUL Interface]] for more information about the <var class="product">Fast/Unload SOUL Interface</var>. | See [[Fast/Unload SOUL Interface]] for more information about the <var class="product">Fast/Unload SOUL Interface</var>. | ||
<div id="WIKFUN$$topics"></div> | <div id="WIKFUN$$topics"></div> | ||
==Fast/Unload topics== | ==Fast/Unload topics== | ||
Revision as of 18:48, 14 January 2015
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 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 SOUL 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.
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