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Text File  |  1992-11-08  |  8KB  |  94 lines
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  14.                        *************************************                    
  15.                        *                                   *                    
  16.                        *          R E L E A S E            *                    
  17.                        *  ON THE MVS/XA OPERATING SYSTEM   *                    
  18.                        *                                   *                    
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  53.                                                         John S. Ward            
  54.                                                           04/15/93              
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  56. EJECT                                                                           
  57.          The RELEASE procedure collects unused disk space from user's data      
  58.     sets and makes it available to the system.  This unused space is            
  59.     generated when you allocate a data set that is larger than you need at      
  60.     the present.  For a partitioned data set, a new copy of a member is         
  61.     made every time you update that member and save it.  Therefore, all the     
  62.     previous copies of that member gradually fill the extra space.  For         
  63.     this reason, you must periodically compress your data set in order to       
  64.     delete the earlier copies.  Compressing a data set, however, only frees     
  65.     the space from the unwanted copies, and releases it back to the data        
  66.     set itself.  It does not allow the system to take over this extra space     
  67.     for other use.                                                              
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  69.          On the other hand, The RELEASE procedure first compresses all          
  70.     partitioned data sets in order to identify the true space used.  Next,      
  71.     it releases the unused spaces from all data sets under a user-id, back      
  72.     to the system.  This does not mean that you cannot ask for more space.      
  73.     Space is dynamically allocated as needed.                                   
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  75.     To release maximum space, go to COMMAND PROCESSOR PANEL (OPTION 6),         
  76.     and enter %RELEASE.  (Or enter TSO %RELEASE from any panel's main           
  77.     command line.)                                                              
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  79.     It may take anywhere from thirty seconds to two minutes for this            
  80.     program to complete execution.  Any data sets that are currently            
  81.     allocated to your terminal are not included in the release process.         
  82.     Additionally, you should not execute %RELEASE at the same time you          
  83.     are running a batch job.  %RELEASE needs to have exclusive use of           
  84.     the data sets and will have to wait if a batch job has one of your          
  85.     data sets.                                                                  
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  87.     NOTE: The RELEASE procedure releases the unused space from the primary      
  88.           allocation, as well as the secondary extents.  The secondary          
  89.           extents are given back as needed, but the unused space from the       
  90.           primary allocation is lost.  Therefore, it is recommended to          
  91.           create data sets that have a small primary allocation, and a          
  92.           larger secondary extends.                                             
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