Fast/Unload overview: Difference between revisions
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<li>Appropriate setting of zIIP and Fast/Unload <var class="product">Model 204</var> system parameters. | <li>Appropriate setting of zIIP and Fast/Unload <var class="product">Model 204</var> system parameters. | ||
<ul> | <ul> | ||
<li>If Fast/Unload is invoked from FUSI, [[ | <li>If Fast/Unload is invoked from FUSI, [[Performance monitoring and tuning#Model 204 parameters for zIIP support|several Model 204 parameters]] are of concern. </li> | ||
<li>Otherwise (that is, <code>PGM=FUNLOAD</code>), | <li>Otherwise (that is, <code>PGM=FUNLOAD</code>), | ||
Revision as of 20:49, 29 March 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 which reads data from a Model 204 file.
- A compiler which 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 which 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 overview
- 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 Model 204 fieldgroups
- 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
- Fast/Unload release notes
- Fast/Unload messages
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.